2018 Vol. 8, No. 5

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2018 Vol.8, No.5
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2018, 8(5): .
Abstract(108) PDF(8125KB)(7)
Abstract:
The cause for abnormal water quality deterioration of Waihai of Dianchi Lake in 2017 and the countermeasures
ZHENG Binghui, PENG Jiayu, HU Xiaozhen, CHU Zhaosheng, PANG Yan, WANG Lijing, XU Xiaomei, HE Jia
2018, 8(5): 465-472. doi: 10.3969/j.issn.1674-991X.2018.05.061
Abstract(1045) PDF(4591KB)(629)
Abstract:
The water quality of Waihai of Dianchi Lake abnormally deteriorated from Ⅴclass to worse than Ⅴclass (Environmental Quality Standards for Surface Water (GB 3838-2002) ) in 2017. Particularly, the concentration of water quality indicators, TP, TN, CODCr and Chla, abnormally rose during June to August. The roots causing the water quality deterioration are as following: compared with the same period of the last year, the precipitation increased by 81% during June to August in 2017, and it is the highest since 1999. Because of the abnormal precipitation, the pollution loads of TN, TP carried by Baoxiang River, Panlong River and Jinzhi River which are the main inflows of Waihai increased by 50% and 59%, respectively, directly leading to the water deterioration of the north of Waihai. In addition, the combined sewage interception system was overflow during the rainstorm, leading to the low collection rate of waste water treatment plants (WWTPs). Compared with the dry season, the average influent concentration of CODCr, TN, TP of the WWTPs of No.2, No.3, No.4 and No.9 decreased by 15%, 15% and 20% in rainy season, and the average influent concentration of CODCr, TN, TP of the WWTPs of No.10 decreased by 16%,19% and 8%, respectively. Meanwhile, compared with the year of 2016, the water supply by Niulanjiang water transfer project decreased by 50%, the concentration of NH3-N, TP, TN increased by 75.2%, 51.1%, 40.2%, and therefore the effect of water quality improvement was reduced. Four strategies to improve the water quality of Waihai of Dianchi Lake were proposed, including improving the sewage collection system and enhancing the efficiency of wastewater collection by advancing the check of pollution interception system; improving the regulation of the combined sewage by optimizing the operation of the built storage pools; improving the purifying rate of sewage treatment plant by optimizing operation, enhancing supervision and joint operation in rainy season; improving the environment efficiency of water supplement project by enhancing the protection and governance of water source area of Niulanjiang River.
Buffer type identification and water quality status of inflow rivers under different buffer patterns in Lake Erhai
WAN Zhengfen, LU Shaoyong, JIN Xiangcan, BI Bin, CHEN Fangxin, QIN Pan
2018, 8(5): 475-480. doi: 10.3969/j.issn.1674-991X.2018.05.062
Abstract(779) PDF(1655KB)(422)
Abstract:
Focusing on the buffer zones of Lake Erhai, and using combined methods of on-site investigation, spatial analysis and data survey, the buffer types of Lake Erhai were identified and the water quality of the inflow rivers under different buffer patterns were analyzed. The results indicated that the buffer structure of Lake Erhai is unreasonable, with excessive proportion of farmland-type and village-type buffer zones. In addition, both the area and shoreline of the village buffer patterns close to the inner parts accounted for over 60% of the buffer zones of Lake Erhai, which mainly located in the western part of the lake. The water quality of main inflow rivers was generally poor, being Class Ⅳ and inferior Ⅴ. The buffer zones of the Tao stream and the Luoshi River were typical “outer cycle-village-farmland-village-inner circle” and “outer cycle-farmland-village-farmland-inner circle” respectively, with inferior Ⅴ class of surface water quality, mainly affected by non-point source pollution such as agricultural non-point sources, residential sources, and tourism pollution. In Lake Erhai buffer zones, the village-type buffers have a large number of external pollution load inputs, while the non-point sources from farmland-type buffers with high fertilization rates and highly polluted decentralized livestock and poultry have direct impacts on the river water quality. Therefore, the area of village-type and farmland-type buffer zones nearby Lake Erhai should be strictly controlled and non-point source pollution from village residential sources, farmland sources and tourism sources should be reduced.
Effects of inflow modes on sewage nitrogen removal by ecological gravel beds
WU Xin, HE Shuzhuang, LU Yifeng, LU Shaoyong, ZHANG Junpeng, HU Tao, ZHANG Senlin, CHEN Fangxin
2018, 8(5): 481-487. doi: 10.3969/j.issn.1674-991X.2018.05.063
Abstract(625) PDF(1175KB)(447)
Abstract:
In order to improve the nitrogen removal rate of residential sewage by ecological gravel beds, four kinds of constructed ecological gravel bed were designed, including Schoenoplectus tabernaemontani bed, Phragmites australis bed, Typha orientalis bed and blank bed without vegetation. The effects of two inflow modes, i.e. continuous inflow and intermittent inflow, on the removal of TN, NH4+-N, and NO3--N were studied. The hydraulic load (HL) was 7.5 cm∕d and the hydraulic retention time (HRT) was 1.8 d under the continuous inflow, while the HL was 7.5 cm∕d and the HRT was 5.4 d under the intermittent inflow. The results show that there exists great difference of the nitrogen removal efficiency between two inflow modes for different ecological gravel beds. The removal rates of TN and ammonia nitrogen under continuous inflow were in the order of Typha orientalis bed> Schoenoplectus tabernaemontani bed > blank bed > Phragmites australis bed, with the highest removal rates by Typha orientalis bed, which removal rate of TN and ammonia nitrogen were 77.68% and 81.33%, respectively; the removal rates of nitrate nitrogen were in the order of blank bed>Phragmites australis bed>Tyha orientalis bed>Schoenoplectus tabernaemontani bed, with thee highest removal rates by blank bed, which removal rate of nitrate nitrogen was 65.29%. The removal rates of TN and ammonia nitrogen under intermittent inflow were in the order of Schoenoplectus tabernaemontani bed > Phragmites australis bed > Typha orientalis bed> blank bed, and the effect of Schoenoplectus tabernaemontani bed was the best, which removal rate of TN and ammonia nitrogen were 89.54% and 91.79%, respectively; the removal rates of nitrate nitrogen were in the order of Schoenoplectus tabernaemontani bed>Typha orientalis bed>blank bed>Phragmites australis bed, the Schoenoplectus tabernaemontanid bed was the best with a removal rate of 46.43%. The removal efficiency of ammonia nitrogen and TN were better improved by intermittent inflow in plant systems. The removal rate of TN and ammonia nitrogen increased by 19.63% and 14.76% in Phragmites australis bed, and the removal rate of TN and ammonia nitrogen increased by 19.14% and 18.60% in Schoenoplectus tabernaemontani bed, respectively.
Nitrogen removal of simulated low-polluted water of Lake Erhai buffer zone by surface-flow wetland
ZHANG Junpeng, LU Yifeng, GUO Xiaochun, LU Shaoyong, WU Xin
2018, 8(5): 488-494. doi: 10.3969/j.issn.1674-991X.2018.05.064
Abstract(767) PDF(1881KB)(514)
Abstract:
Aiming at the pollution problem of typical low-polluted water (produced by agricultural non-point sources) in Lake Erhai buffer zone, the typical buffer zone mostly occupied by farmland between Baihe Stream and Mei Stream in the western Lake Erhai basin were selected to monitor the surface runoff quality of the buffer zone, and to set up the surface flow pilot wetland for field study. The nitrogen removal effect for simulated low-polluted water of Lake Erhai buffer zone from September 2016 to August 2017 was studied. The results indicate that the pilot system has a high nitrogen removal effect, with annual average removal rate of total nitrogen as Nymphoides peltatum wetland (83.1%) >reed wetland (73.9%) >Hydrilla verticillata wetland (73.3%) >blank wetland (65.5%). The average annual removal rate of ammonia nitrogen was higher than 77%. Among different plant systems, Nymphoides peltatum system has the best removal effect of total nitrogen and the most stable removal rate. The removal rate and width of each system were simulated, and it reveals that the optimum width of the Nymphoides peltatum, Hydrilla verticillata and Phragmites communis wetland systems was respectively 7.04 m, 8.64 m and 6.92 m while the effluent water quality is of class Ⅲ water. The contribution rate of nitrogen removal in Nymphoides peltatum, Hydrilla verticillata and Phragmites communis wetland systems during the test is 5.88%, 3.23% and 21.12%, respectively. The total nitrogen content of reeds in wetlands is significantly higher than that of Nymphoides peltatum and Hydrilla verticillata. The contribution rate of Phragmites communis and Hydrilla verticillata to nitrogen removal in wetland shows a large seasonal difference, while the contribution rate of Nymphoides peltatum in wetland to nitrogen removal in different seasons varies little.
Treatment ideas and technical measures of black and stinky water bodies
ZHU Yunjie, LI Guowen, ZHANG Lieyu, XU Qiujin, SONG Yonghui
2018, 8(5): 495-501. doi: 10.3969/j.issn.1674-991X.2018.05.065
Abstract(2339) PDF(893KB)(623)
Abstract:
In China the blackening and stinking of urban waters is a common phenomenon. At present, large-scale governance of black and stinky (BS) water bodies is underway. The seriousness of the problem of BS water bodies in China was briefly introduced, and the current national policy and governance objectives for the treatment of BS water bodies elaborated. The concept of BS water bodies was analyzed, and the idea for their treatment was put forward. The treatment technical route was clarified, including the investigation and diagnosis of problems, the verification of pollutant loads, and the determination of treatment targets of BS water bodies. Formulation of applicable technologies and governance programs, and forecasting of governance effects were also involved. On these bases, the main technical measures for the treatment of BS water bodies were proposed, including pollution source control, hydraulic regulation and ecological restoration, and meanwhile, it was noted that comprehensive management must be strengthened. The progress and of governance cases of BS water bodies at home and abroad were reviewed, and the governance process and existing problems were analyzed. Finally, the suggestions for the treatment of BS water bodies were proposed from four aspects, i.e. the evaluation indicators, the technical systems, the management mechanisms, and the publicity and education.
Nutritional characteristics and aquatic ecosystem health assessment in cascade reservoirs of Wuxijiang
ZHANG Xiaolin, ZHANG Jingtian, CHI Chunjuan, MA Chunzi, LI Xiaochuang, XIAO Zhe, AN Zhenzhen
2018, 8(5): 502-509. doi: 10.3969/j.issn.1674-991X.2018.05.066
Abstract(785) PDF(1041KB)(503)
Abstract:
Extensive cascading hydropower dam exploitation may profoundly affect the river ecosystem health. The nutritional characteristics and community structure of phytoplankton in upstream Hunanzhen reservoir and downstream Huangtankou reservoir in Wuxijiang cascade reservoirs from June 2017 to November 2017 were investigated, and the assessment of the reservoir aquatic ecosystem health was performed by Index of Biological Integrity (IBI) method. The results indicated that nitrogen, phosphorus and organic matter contents of Wuxijiang cascade reservoirs were low, the nutritional level was poor. The 152 taxa of phytoplankton belonging to 8 phyla were identified, the densities of cyanobacteria and chlorophyte were high, and the phytoplankton density in downstream Huangtankou reservoir was lower than that in upstream Hunanzhen reservoir. The IBI assessment result showed that Wuxijiang cascade reservoirs were in relatively high biological integrity, and at normal to sub-health level. The IBI index was significantly affected by the water temperature, suggesting that the good health level was found in Huangtankou reservoir with low water temperature, but in Hunanzhen reservoir with high water temperature.
Adsorption performance and influencing factors of manganese sand filter media on phenol removal in drinking water treatment plant
SUN Xiaoling, YANG Yu, MA Zhifei, JIANG Yonghai, DONG Zixuan, LIAN Xinying
2018, 8(5): 510-518. doi: 10.3969/j.issn.1674-991X.2018.05.067
Abstract(643) PDF(2611KB)(491)
Abstract:
In order to understand the adsorption performance and influencing factors of manganese sand filter material on phenol, the waste material produced after the operation of biological manganese sand filter was used as adsorbent. The adsorption performance of manganese sand filter material on phenol under different pH, temperature and dissolved oxygen conditions was studied respectively. The adsorption law of manganese sand filter material was studied by adsorption kinetic model and adsorption isotherm model. The results showed that the adsorption process of manganese sand media for phenol was in accordance with the internal diffusion kinetic model and Temkin isothermal adsorption model, being the monolayer adsorption. The adsorption effect was mainly affected by the diffusion rate of phenol. Through the calculation of n value of adsorption isotherm, it is found that manganese sand filter material is easy to adsorb phenol. The pH had the greatest effect on the removal of phenol from manganese sand filter. When pH=3.0, phenol could be removed completely. The removal rate of phenol decreased gradually with the increase of pH. The effect of hypoxia on phenol adsorption was not significant under neutral condition. The removal rate of phenol was increased by increasing the dosage of manganese sand filter material under low temperature condition. The removal rate of phenol was increased 20 percent for every 1.5 times of manganese sand filter material. When that manganese sand filter material is applied to remove phenol from the underground water, the method should achieve the good effect of recycling waste and repairing phenol pollute water body, does not generate secondary pollution phenomenon, and has good application prospects.
Adsorption of Zn(Ⅱ) from wastewater by sulfhydryl rice husk carbon
CHENG Deyi, DU Chao, HUANG Zhaoqin, DAI Jingyu, DU Qiwen, SHAO Aiyun
2018, 8(5): 519-526. doi: 10.3969/j.issn.1674-991X.2018.05.068
Abstract(633) PDF(1412KB)(397)
Abstract:
Removal of zinc ions from the wastewater by mercapto acetic acid modified rice husk carbon was studied. The effects of pH, reaction temperature and time, and desorption on the adsorption effect of thiol based rice husk carbon were studied. Scanning electron microscopy and X ray energy spectrum analysis of modified materials were carried out. The results showed that the surface of modified rice husk carbon was more smooth and porous, and the surface functional group —SH content increased by the chemical modification to rice husk carbon, and the adsorption capacity of Zn(Ⅱ) was improved. The modified rice husk carbon has a wide range of pH (6-8), and the adsorption equilibrium is reached at 300 min at 25 ℃. The adsorption process conforms to the pseudo two kinetic equation and is an endothermic reaction. According to the activation energy calculation by Arrhenius empirical equation, the adsorption belongs to active chemical adsorption. Based on the Langmuir adsorption isotherm equation, the theoretical saturated adsorption capacity of the thiol rice husk carbon to Zn(Ⅱ) is 11.26 mg∕g. When combined with desorption, it is known that the adsorbent has good immobilization on Zn(Ⅱ) and has certain adsorption effect.
Research on removal of Taihu Lake algal source DON by KMnO4 pre-oxidation and coagulation sedimentation
ZHANG Qian, LIU Xiaodong, DENG Feifan
2018, 8(5): 527-532. doi: 10.3969/j.issn.1674-991X.2018.05.069
Abstract(575) PDF(1136KB)(306)
Abstract:
The removal efficiency of dissolved organic nitrogen (DON) in the algae-laden water using KMnO4 pre-oxidation and enhanced coagulation sedimentation was studied by experiment. The mechanism was analyzed using molecular weight distribution measuring method and two-dimensional electrophoresis method. The results showed that the optimal working condition happened when KMnO4 dosage was 1.00 mg∕L, the pre-oxidation time were controlled in 30 min, and the PAC dosage was 20 mg∕L, then the DON removal rates reached 36.0%, the turbidity and algae removal rates reached 88.3% and 93.0%. KMnO4 pre-oxidation enhanced coagulation sedimentation can be used as an emergency treatment option for the removal of DON when the source water algae bloom.
Study on variation characteristics and estimation model of PM2.5 concentration in Beijing in winter
XIONG Junli, LI Caiyan
2018, 8(5): 533-538. doi: 10.3969/j.issn.1674-991X.2018.05.070
Abstract(638) PDF(806KB)(519)
Abstract:
Based on the hourly air quality monitoring data in Beijing in January 2017, the hourly and regional changes of the concentration of PM2.5 in Beijing were discussed, and the estimation models of PM2.5, PM10 and major gaseous pollutants of 12 sites were constructed by multiple stepwise regression. The results showed that the hourly concentration change trend of PM2.5 concentration in Beijing was high at night (18:00-07:00) and low in the daytime (08:00-17:00), the monthly averaged PM2.5 concentrations of 3 sites in Huairou Town, Changping Town and Dingling were relatively low (78-94 μg∕m 3), while that of other sites were between 106-128 μg∕m 3. The correlation between PM10, 4 kinds of gaseous pollutants and PM2.5 was in the order of PM10>CO>NO2>O3>SO2. The adjustment coefficient R adj 2 of the PM2.5 concentration estimation model of the 12 sites was all more than 0.96, and the standard error SE was between 13.6-24.5. It is more effective to estimate the PM2.5 concentration of the site by using the estimation model of the site itself, and the effect of estimating the PM2.5 concentration was poorer by using the data of other sites.
Progress in catalytic oxidation of elemental mercury by modified SCR catalysts
QIN Yadi, WANG Shujuan, ZHUO Yuqun
2018, 8(5): 539-545. doi: 10.3969/j.issn.1674-991X.2018.05.071
Abstract(717) PDF(811KB)(441)
Abstract:
Targeting the oxidation of elemental mercury (Hg 0) in the flue gas from coal-fired power plant, the research progress of the catalytic oxidation by modified selected catalytic reduction (SCR) catalysts for elemental mercury was reviewed, focusing on the influence of metal oxides or chlorides doped SCR catalysts on elemental mercury oxidation. The activity of modified SCR catalysts for elemental mercury was explored from the effects of dopant, doping ratio, flue gas components and temperature. In addition, the heterogeneous reaction mechanisms between elemental mercury and the modified SCR catalysts were analyzed synthetically with respects to doping elements and flue gas conditions. Finally, considering the current situation of coal-fired plants, the prospects of future studies on modified SCR catalyst and the relevant experimental methods were proposed.
The application of hedonic tone in odour pollution sensory evaluation
ZHAI Zengxiu, LI Weifang, ZOU Kehua, YANG Weihua
2018, 8(5): 546-550. doi: 10.3969/j.issn.1674-991X.2018.05.072
Abstract(851) PDF(853KB)(566)
Abstract:
In order to enrich the sensory evaluation indicators of odour pollution in China, a 9-point hedonic tone method was used to determine the hedonic tone of samples at different odour concentrations from three typical odour emission sources including rubber products, bakery and landfill. A comprehensive evaluation model of odour pollution and hedonic tone was put forward by analyzing the relationship between odour concentration (odour index) and hedonic tone, that is, the annoyance potential of source = odour index × hedonic tone. The results showed that the hedonic tone of rubber products and landfill sites was negative value, while that of food processing was positive value. The relationships between the odour concentration and hedonic tone from the three kinds of emission sources are in line with the quadratic polynomial model. In addition, the correlation coefficients all reached above 0.99. The annoyance potential calculation results showed that the annoyance potential of rubber products and the landfill was -200.91 and -144.80 respectively, and that of food processing was 79.66. Applying this method, the different odour sources could be distinguished more intuitively, especially for the sources that have similar odour concentrations and different odours. Then the key emission sources and key emission units could be accurately identified. The research indicated that hedonic tone reflects the psychological impact of odour on people and its harmful degree more accurately, and it is necessary to apply hedonic tone to odour pollution sensory evaluation.
Study on ammonia emission of sewage treatment process of a pharmaceutical enterprise in Shijiazhuang
LIU Cuimian, DOU Hong, JIANG Jianbiao, GAO Yuan, CHANG Qing
2018, 8(5): 551-555. doi: 10.3969/j.issn.1674-991X.2018.05.073
Abstract(661) PDF(785KB)(308)
Abstract:
In order to study on ammonia emission characteristics of sewage treatment process of a pharmaceutical enterprise, waste gas samples were collected from several wastewater treatment units and waste gas discharge outlet in sewage treatment progress of pharmaceutical industry to analyze NH3 emission characteristics. The study results showed that:the maximum NH3 emission appeared at hydrolysis acidification unite, the point concentration reached 62.89 mg∕m 3,emission reached 3 360 mg∕m 3 for each treatment of 1 m 3 sewage, The sewage treatment process of each unit of ammonia amount was 0.97 kg∕h, the conversion for each treatment 1 m 3wastewater, ammonia production 9 312 mg∕m 3, after the treatment of waste gas discharged into the environment ammonia was 0.25 kg∕h, emission reached 2 400 mg∕m 3 for each treatment of 1 m 3 sewage, ammonia removal rate was 74.2%, the emission of ammonia gas was obviously reduced after the treatment of exhaust gas. Waste gas treatment in the southern and northern areas adopts the technology of caustic wash+oxidation+washing. The removal rate of ammonia was 93.3% and 83.1%, The ammonia removal rate of the waste gas treatment facility in the biological zone is 39.1%. Caustic wash+oxidation+washing has better effect than biotrickling filter in the removal the ammonia.
Heavy metal pollution and ecological risk assessment of arable land soil in Haigou small watershed
JU Tienan, WU Xiao, SHI Huading, GAO Fengjie, LI Xinzhe, WANG Yuyao, LUAN Tian, FAN Ping
2018, 8(5): 556-562. doi: 10.3969/j.issn.1674-991X.2018.05.074
Abstract(607) PDF(2346KB)(415)
Abstract:
In order to understand the current situation of heavy metal pollution in the arable land of the Haigou small watershed, 106 samples of the surface soil of the arable land were collected in the small watershed, and the inverse distance weighting interpolation method and the Hakanson potential ecological risk index method were used to analyze the distribution of Cd, Pb, Hg, Cu and As in the arable land, in combination with the RS image interpretation and the ArcGIS land statistics method. The results showed that the average contents of heavy metals Cd, Pb, Hg, Cu and As were 0.307, 23.422, 0.041, 21.544 and 12.235 mg∕kg respectively, which were all higher than the background values of Heilongjiang Province. Compared with Soil Environmental Quality Standard (GB 15618-1995), the content of Cd exceeds Class Ⅱ standard, and that of other heavy metals meets Class Ⅰ standard. In terms of the spatial distribution of heavy metals, it was found that the change of As content gradually decreased from east to west, and the change of Cd content was opposite to that of As, which gradually decreased from east to west. The potential ecological risk of the arable land was evaluated by the Hakanson potential ecological risk index method. The results showed that the ecological risk grades of Cd and Hg in the arable land of the Haigou small watershed were relatively high and medium, while that of Pb, Cu and As were mild. Therefore, the potential ecological risk of the farmland in the Haigou small watershed was generally in the middle.
Measurement and analysis of influence effect of high-tech industry development on industrial pollution based on PLS method
ZHANG Leqin, CHEN Suping
2018, 8(5): 563-570. doi: 10.3969/j.issn.1674-991X.2018.05.075
Abstract(559) PDF(885KB)(367)
Abstract:
Taking Anhui Province as an example, the entropy weighting method was used to evaluate the industrial pollution situation. Based on STIRPAT model, the typical correlation and partial least squares regression analysis methods were adopted to investigate the influence effect of industrial pollution caused by high-tech industry. The results showed that firstly, the pollution index decreased from 0.537 1 in 2005 to 0.469 3 in 2015 with annual average reduction of 1.34%. Secondly, the driving factors of industrial pollution include high-tech industry development, economic growth, fixed asset investments, urbanization, per capital household consumption level, direct foreign investment, environmental regulation policies, industrial structure and marketization degree. Thirdly, the high-tech industry development, economic growth, urbanization level, per capital household consumption level and the interaction terms of economic development and high-tech industry development make significant inhibitory effects on industrial pollution; with their increase rate of 1%, the industrial pollution index is caused to decrease by 0.087 8%, 0.047 0%, 0.000 9%, 0.027 6% and 0.259 8% respectively. Fourthly, the fixed asset investments, industrial structure, direct foreign investment, marketization degree and environmental regulation have positive driving effects on industrial pollution; when increasing by 1%, the industrial pollution index increases by 0.036 6%, 0.000 2%, 0.271 8%, 0.008 1% and 0.031 8% respectively.
Characterization of VOCs emission in automotive industrial park in Chongqing
FAN Li, LI Peng, LI Wensheng, ZHAO Jing, LIANG Jian, SONG Dan
2018, 8(5): 571-576. doi: 10.3969/j.issn.1674-991X.2018.05.076
Abstract(685) PDF(1731KB)(505)
Abstract:
The emission concentrations, amounts and composition characteristics of volatile organic compounds (VOCs) were investigated from 13 key factories in an automotive industrial park in Chongqing, based on the local standards, i.e. Emission Standrds of Air Pollutants for Surface Coating of Automobile Manuaturing Industry and Emission Standrds of Air Pollutants for Surface Coating of Motocycle and Auto Parts Manuaturing Industry. The results showed that the VOCs concentration of various emission links of the industrial park ranged at 0-243.00 mg∕m 3, with the largest concentration of production being concentrated on the surface coating process. The maximum instantaneous VOCs emission was 141.146 kg∕h, and the VOC emisson from auto parts factories containing surface coating process accounted for 66% of the total emission of the industrial park. The main VOCs matters detected were n-butyl acetate(37%), xylene(30%) and ethylbenzene(18%), and the VOCs species varied with different factories, considerably due to their differences in diluents. Finally, it was proposed that the surface coating of auto parts factories should be the main focus of the environment management in the industrial park.

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