ZHENGJiongzhou,RENZhihong,CHENYuhang,et al.Three-stage UASB Coupled with A/O Process for Treating High COD Cellulose Ether Production Wastewater[J].China Water & Wastewater,2026,42(9):108-115.
三级UASB耦联A/O处理高COD纤维素醚生产废水
- Title:
- Three-stage UASB Coupled with A/O Process for Treating High COD Cellulose Ether Production Wastewater
- Keywords:
- three-stage UASB; A/O process; high COD chemical wastewater; start-up
- 摘要:
- 河南省某化工厂的纤维素醚生产废水经过物化单元处理后COD仍然高达45 000~46 000 mg/L，为实现稳定达标，采用三级UASB耦联A/O工艺对其进行处理，重点考察了组合工艺的启动特性及污染物去除效果。结果表明，三级UASB在温度为35 ℃、进水pH>6.8条件下，进水COD从3 000 mg/L逐步提高到45 000～46 000 mg/L，HRT由45 d缩短至6.7 d，稳定运行后COD去除率保持在97%以上，UASB1对COD的平均去除率达到80%，远超过UASB2（13%）和UASB3（3%），pH表现为UASB1<UASB2<UASB3，各级UASB的挥发性有机酸/总碱度（VFAs/TA）均低于0.3，平均产气率达到2.28 L/（L·d），单位有机物产气量达到349.82 mL/gCOD。A/O工艺满负荷运行后，在混合液回流比为200%、污泥回流比为100%、污泥龄（SRT）为12.5 d条件下，COD、TN、NH3-N、TP去除率分别为84.81%、78.82%、98.39%、77.38%，运行稳定，出水水质达到了河南省《化工行业水污染物间接排放标准》（DB41/1135—2016）和园区污水处理厂收水标准。
- Abstract:
- The wastewater from a cellulose ether production plant in Henan Province still had a COD of 45 000 mg/L to 46 000 mg/L after physical and chemical treatment. To achieve stable compliance, a three-stage UASB coupled with A/O process was adopted for its treatment. The start-up characteristics and pollutants removal effect were investigated. The results showed that under the conditions of 35 ℃ and influent pH>6.8, the influent COD of the three-stage UASB was gradually increased from 3 000 mg/L to 45 000-46 000 mg/L, and the HRT was shortened from 45 days to 6.7 days. After stable operation, the COD removal rate remained above 97%, with an average COD removal rate of 80% in UASB1, far exceeding that of UASB2 (13%) and UASB3 (3%). The pH separation was UASB1<UASB2<UASB3, and the ratio of volatile fatty acids and total alkalinity (VFAs/TA) of each stage was less than 0.3. The average gas production rate reached 2.28 L/(L·d), and the gas production per unit organic matter was 349.82 mL/gCOD. After the A/O process was fully loaded, with the mixed liquor return ratio of 200%, sludge return ratio of 100%, and SRT maintained at 12.5 days, the removal rates of COD, TN, NH3-N, and TP were 84.81%, 78.82%, 98.39%, and 77.38%, respectively. The operation was stable, and the effluent met the Indirect Discharge Standards for Water Pollutants in the Chemical Industry (DB41/1135-2016) in Henan Province and the receiving water standards of the wastewater treatment plant in the industrial park.
相似文献/References:
[1]王骞乐,荣懿,徐瑶瑶,等.农村户内生态渗井的除污特性及微生物种群结构[J].中国给水排水,2024,40(7):36.
WANGQian-le,RONGYi,XUYao-yao,et al.Pollutants Removal Characteristics and Microbial Community Composition of Indoor Ecological Seepage Wells in Rural Areas[J].China Water & Wastewater,2024,40(9):36.
[2]胡光明,朱乐辉.含苯酚油墨废水处理工程实例[J].中国给水排水,2024,40(14):126.
HUGuang-ming,ZHULe-hui.Phenol-containing Printing Ink Wastewater Treatment Project Case[J].China Water & Wastewater,2024,40(9):126.
[3]李福勤,郑煚州,陈宇航,等.高盐、高COD化工废水资源化处理工程实例[J].中国给水排水,2025,41(8):114.
LIFu-qin,ZHENGJiong-zhou,CHENYu-hang,et al.Resource Recovery Treatment for High-salinity and High COD Wastewater:A Project Case[J].China Water & Wastewater,2025,41(9):114.
[4]杨子康,龚茂春,蒋宏凯,等.麻染整PVA生产废水处理工程运行性能研究[J].中国给水排水,2025,41(16):96.
YANGZi-kang,GONGMao-chun,JIANGHong-kai,et al.Operation Performance of a Hemp Dyeing and Finishing PVA Production Wastewater Treatment Plant[J].China Water & Wastewater,2025,41(9):96.