Performance and Feasibility of ANAMMOX Bio-filter Process for Advanced Treatment of Dry-spun Acrylic Fiber Wastewater
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摘要: 针对石化干法腈纶厂出水氨氮浓度高、可生化性差、无法达标的问题，以石化干法腈纶厂三沉池出水作试验用水，研究ANAMMOX生物滤池工艺深度处理干法腈纶废水的可行性与脱氮性能。结果表明，经过130 d驯化，ANAMMOX生物滤池对干法腈纶厂出水中氨氮具有较强的去除能力，出水NH4+-N浓度由184.1~205.3 mg/L降到23.4~30.3 mg/L，去除率达83.5%；外加NO2--N去除率达93.6%以上，NH4+-N和NO2--N去除摩尔比接近1:1（理论值为1:1.32），TN去除负荷达2.36~4.80 kg/(m3/d)；但出水TN浓度仍高达165.9~180.7 mg/L，并主要以难降解含氮有机物的形式存在。ANAMMOX生物滤池对出水难降解的CODCr具有进一步的去除能力，去除负荷可达2.39~2.56 kg/(m3/d)，出水CODCr由487.9~532.1 mg/L降至188.6~212.3 mg/L，处理后出水可满足GB 8978—1996《污水综合排放标准》中石化工业所要求的二级排放标准。Abstract: Aiming at the high ammonia-nitrogen concentration, low biodegradability and non-compliance issues of dry-spun acrylic fiber wastewater, the effluent of third-sedimentation tank was taken as experimental substrate to research the feasibility and performance of ANAMMOX bio-filter process for advanced treatment of dry-spun acrylic fiber wastewater. The results indicated that the ANAMMOX bio-filter had a good denitrification ability of dry-spun acrylic fiber wastewater after 130 days domestication, the effluent ammonia-nitrogen concentration decreased from 184.1-205.3 mg/L to 23.4-30.34 mg/L, and the removal efficiency of ammonia-nitrogen reached 83.5%. The removal efficiency of NO2--N reached up to 93.6%, the removal of NH4+-N and NO2--N efficiencies were close to 1:1 (theoretical value 1:1.32), and the total nitrogen removal load reached 2.36-4.80 kg/(m3/d). However, the effluent concentration of total nitrogen was still as high as 165.9-180.7 mg/L, mainly exiting in the form of refractory organics. In addition, the removal of CODCr with ANAMMOX bio-filter process was confirmed, the removal load reached up to 2.39-2.56 kg/(m3/d), the effluent CODCr decreased from 487.9-532.1 mg/L to 188.6-212.3 mg/L, which could meet the requirement of Class II standard of National Discharge Standard for Petrochemical Industry (GB 8978-1996) in China.
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Keywords:
- ANAMMOX /
- acrylic fiber wastewater /
- bio-filter /
- nitrogen removal /
- advanced treatment
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