| Citation: | ZHU S Y,WANG Y L.Effect of Fe2+-PDS conditioning-horizontal electro-dewatering process on dewatering performance of dredged sediment[J].Journal of Environmental Engineering Technology，2023，13（6）：2192-2203 doi: 10.12153/j.issn.1674-991X.20230045
|
Aiming at the problem of restricting the subsequent disposal of dredged sediment with high water content, Fe2+-perdisulfate (PDS) conditioning - horizontal electro-dewatering (HED) process was used to treat sediment samples. The operating parameters (Fe2+ and PDS dosage, voltage, power-on time) of Fe2+-PDS conditioning - HED process were optimized through the response surface method (RSM), and the variations in the morphology and properties of the sediment at the conditioning stage, as well as the changes in the water content and organic components of the sediment at various stages of the process (conditioning, gravity settling, HED) were analyzed. The results showed as follows: 1) The optimal dosage of Fe2+ and PDS for the conditioning stage was 4 mg/g (TSS) and 10 mg/g (TSS), respectively. The optimal power-on time and voltage of the HED stage were 80 min and 45 V, respectively. Under the above parameters, the water content of dredged sediment decreased from 88.55% to 55.15%. 2) At the conditioning stage, the bound water content of sediment decreased from 0.44 g/g (DS) to 0.28 g/g, the total amounts of proteins and polysaccharides in extracellular polymeric substances (EPS) increased, while the fluorescence intensity of protein-like substances and soluble microbial byproduct-like materials (SMBP) in Slime layer decreased. The total fluorescence intensity in the tightly bound EPS (TB-EPS) increased to 12.40×107 AU·nm2. At the HED stage, the effect of electric field led to further release of the organic matters in the sediment around the cathode region, and the fluorescence intensity of SMBP in each layer of EPS around the cathode region increased significantly. 3) SO4 −· produced at the conditioning stage could oxidize and crack the microbial cells in the sediment and release the intracellular contents into EPS, and the simultaneous changes in water distribution and EPS components of the sediment occurred. Fe(Ⅲ) produced in situ altered the floc structure of the sediment through coagulation, thus contributing to the improvement of the dewatering performance of the sediment. The research showed that Fe2+-PDS conditioning-HED process could effectively reduce the water content of the dredged sediment, so as to provide technical support for the treatment of dredged sediment.
| [1] |
钱旭. 活性污泥磁化调理-电脱水性能与过程机制研究[D]. 北京: 北京林业大学, 2016.
|
| [2] |
陈雄峰, 荆一凤, 吕鑑, 等.电渗法对太湖环保疏浚底泥脱水干化研究[J]. 环境科学研究,2006,19(5):54-58. doi: 10.3321/j.issn:1001-6929.2006.05.010
CHEN X F, JING Y F, LÜ J, et al. The research of environmental dredged sludge dewatering in Taihu Lake by electro-osmotic[J]. Research of Environmental Sciences,2006,19(5):54-58. doi: 10.3321/j.issn:1001-6929.2006.05.010
|
| [3] |
季雪元, 王毅力, 冯晶.水平电场作用下活性污泥的脱水研究[J]. 环境科学,2012,33(12):4393-4399.
JI X Y, WANG Y L, FENG J. Study on dewatering of activated sludge under applied electric field[J]. Environmental Science,2012,33(12):4393-4399.
|
| [4] |
MAHMOUD A, OLIVIER J, VAXELAIRE J, et al. Electro-dewatering of wastewater sludge: influence of the operating conditions and their interactions effects[J]. Water Research,2011,45(9):2795-2810. doi: 10.1016/j.watres.2011.02.029
|
| [5] |
李英华, 黄天赐, 钱杰, 等.基于过硫酸盐的高级氧化工艺修复有机污染土壤的研究进展[J]. 环境科学研究,2023,36(1):168-179.
LI Y H, HUANG T C, QIAN J, et al. Persulfate based-advanced oxidation process for organic-contaminated soil remediation: a review[J]. Research of Environmental Sciences,2023,36(1):168-179.
|
| [6] |
ZHOU X, WANG Q L, JIANG G M, et al. A novel conditioning process for enhancing dewaterability of waste activated sludge by combination of zero-valent iron and persulfate[J]. Bioresource Technology,2015,185:416-420. doi: 10.1016/j.biortech.2015.02.088
|
| [7] |
LI H X, WANG Y L, ZHENG H L. Variations of moisture and organics in activated sludge during Fe0/S2O82− conditioning-horizontal electro-dewatering process[J]. Water Research,2018,129:83-93. doi: 10.1016/j.watres.2017.11.006
|
| [8] |
SHA L, WU Z X, LING Z C, et al. Investigation on the improvement of activated sludge dewaterability using different iron forms (ZVI vs. Fe(Ⅱ))/peroxydisulfate combined vertical electro-dewatering processes[J]. Chemosphere,2022,292:133416. doi: 10.1016/j.chemosphere.2021.133416
|
| [9] |
李代魁, 何萍, 刘存歧, 等.应用多种生物类群评价白洋淀水环境质量变化[J]. 应用生态学报,2021,32(12):4488-4498.
LI D K, HE P, LIU C Q, et al. Evaluation of eutrophication level changes in Baiyangdian Lake based on multiple biological groups[J]. Chinese Journal of Applied Ecology,2021,32(12):4488-4498.
|
| [10] |
尹德超, 王雨山, 祁晓凡, 等. 白洋淀表层沉积物氮磷分布、储量及污染评价[J/OL]. 地质通报, 2022. (2022-03-03)[2023-01-12]. https://kns.cnki.net/kcms/detail/11.4648.P.20220301.1851.002.html.
YIN D C, WANG Y S, QI X F, et al. Distribution, reserves and pollution evaluation of nitrogen and phosphorus in surface sediments of Baiyangdian Lake[J/OL]. Geological Bulletin of China, 2022. (2022-03-03)[2023-01-12]. https://kns.cnki.net/kcms/detail/11.4648.P.20220301.1851.002.html.
|
| [11] |
魏伟伟, 李春华, 叶春, 等.基于底泥重金属污染及生态风险评价的星云湖疏浚深度判定[J]. 环境工程技术学报,2020,10(3):385-391.
WEI W W, LI C H, YE C, et al. Determination of dredging depth of Xingyun Lake based on heavy metal pollution and ecological risk assessment of sediment[J]. Journal of Environmental Engineering Technology,2020,10(3):385-391.
|
| [12] |
万雪娇. 白洋淀疏浚底泥处理及资源化利用技术研究[D]. 天津: 天津大学, 2019.
|
| [13] |
GAO Y F, ZHOU Y. Effect of vacuum degree and aeration rate on sludge dewatering behavior with the aeration-vacuum method[J]. Journal of Zhejiang University-Science A (Applied Physics & Engineering),2010,11(9):638-655. doi: 10.1631/jzus.A0900651
|
| [14] |
FAN X Y, WANG Y L, ZHANG D X, et al. Effects of acid, acid-ZVI/PMS, Fe(Ⅱ)/PMS and ZVI/PMS conditioning on the wastewater activated sludge (WAS) dewaterability and extracellular polymeric substances (EPS)[J]. Journal of Environmental Sciences,2020,91:73-84. doi: 10.1016/j.jes.2020.01.009
|
| [15] |
LI Y F, YANG F, MIAO S Z, et al. Achieved deep-dewatering of dredged sediments by Fe(Ⅱ) activating persulfate pretreatment: Filtrating performance and mechanistic insights[J]. Chemical Engineering Journal,2021,405:126847. doi: 10.1016/j.cej.2020.126847
|
| [16] |
GUO J Y, GAO Q F, CHEN Y H, et al. Insight into sludge dewatering by advanced oxidation using persulfate as oxidant and Fe2+ as activator: performance, mechanism and extracellular polymers and heavy metals behaviors[J]. Journal of Environmental Management,2021,288:112476. doi: 10.1016/j.jenvman.2021.112476
|
| [17] |
李婷, 王毅力, 冯晶, 等.活性污泥的理化性质与絮凝调理投药量的关系[J]. 环境科学,2012,33(3):889-895.
LI T, WANG Y L, FENG J, et al. Relationship between physicochemical characteristics of activated sludge and polymer conditioning dosage[J]. Environmental Science,2012,33(3):889-895.
|
| [18] |
NIU M Q, ZHANG W J, WANG D S, et al. Correlation of physicochemical properties and sludge dewaterability under chemical conditioning using inorganic coagulants[J]. Bioresource Technology,2013,144:337-343. doi: 10.1016/j.biortech.2013.06.126
|
| [19] |
国家环境保护总局. 水和废水监测分析方法[M]. 4版. 北京: 中国环境科学出版社, 2002.
|
| [20] |
LEE D J, LEE S F. Measurement of bound water content in sludge: the use of differential scanning calorimetry (DSC)[J]. Journal of Chemical Technology AND Biotechnology,1995,62(4):359-365. doi: 10.1002/jctb.280620408
|
| [21] |
YU G H, HE P J, SHAO L M, et al. Stratification structure of sludge flocs with implications to dewaterability[J]. Environmental Science & Technology,2008,42(21):7944-7949.
|
| [22] |
FR/OLUND B, GRIEBE T, NIELSEN P H. Enzymatic activity in the activated-sludge floc matrix[J]. Applied Microbiology and Biotechnology,1995,43(4):755-761. doi: 10.1007/BF00164784
|
| [23] |
陈钧辉. 生物化学实验[M]. 3版. 北京: 科学出版社, 2003.
|
| [24] |
CHEN W, WESTERHOFF P, LEENHEER J A, et al. Fluorescence excitation–emission matrix regional integration to quantify spectra for dissolved organic matter[J]. Environmental Science & Technology,2003,37(24):5701-5710.
|
| [25] |
CHEN Y S, CHEN H P, LI J, et al. Rapid and efficient activated sludge treatment by electro-Fenton oxidation[J]. Water Research,2019,152:181-190. doi: 10.1016/j.watres.2018.12.035
|
| [26] |
QIAN X, WANG Y L, ZHENG H L. Migration and distribution of water and organic matter for activated sludge during coupling magnetic conditioning-horizontal electro-dewatering (CM-HED)[J]. Water Research,2016,88:93-103. doi: 10.1016/j.watres.2015.10.001
|
| [27] |
HE D Q, LUO H W, HUANG B C, et al. Enhanced dewatering of excess activated sludge through decomposing its extracellular polymeric substances by a Fe@Fe2O3-based composite conditioner[J]. Bioresource Technology,2016,218:526-532. doi: 10.1016/j.biortech.2016.06.139
|
| [28] |
TUAN P A, JURATE V, MIKA S. Electro-dewatering of sludge under pressure and non-pressure conditions[J]. Environmental Technology,2008,29(10):1075-1084. doi: 10.1080/09593330802180294
|
| [29] |
DIGNAC M F, URBAIN V, RYBACKI D, et al. Chemical description of extracellular polymers: implication on activated sludge floc structure[J]. Water Science and Technology,1998,38(8/9):45-53.
|
| [30] |
高诗卉. Fe0/Fe3C@CS激发PMS与peroxone-Fe(Ⅲ)调理对活性污泥脱水性能的影响研究[D]. 北京: 北京林业大学.
|
| [31] |
LIU J, YANG Q, WANG D B, et al. Enhanced dewaterability of waste activated sludge by Fe(Ⅱ)-activated peroxymonosulfate oxidation[J]. Bioresource Technology,2016,206:134-140. doi: 10.1016/j.biortech.2016.01.088
|
| [32] |
YOU G X, WANG P F, HOU J, et al. Insights into the short-term effects of CeO2 nanoparticles on sludge dewatering and related mechanism[J]. Water Research,2017,118:93-103. doi: 10.1016/j.watres.2017.04.011
|
| [33] |
GAO S H, WANG Y L, ZHANG D X, et al. Insight to peroxone-Fe(Ⅲ) joint conditioning-horizontal electro-dewatering process on water reduction in activated sludge: performance and mechanisms[J]. Journal of Hazardous Materials,2021,402:123441. ⊗ doi: 10.1016/j.jhazmat.2020.123441
|
Figures(11) / Tables(8)
Copyright © Editorial Department of Journal of Environmental Engineering Technology
Supported by: Beijing Renhe Information Technology Co., Ltd.
DownLoad:
