Treatment of tanning wastewater by integrated process consisted of coagulation, anaerobic baffled reactor and anoxic/aerobic-membrane bioreactor

doi:10.11949/j.issn.0438-1157.20160123

Abstract

Abstract:

Tanning wastewater is difficult to be treated due to its high concentration of suspended solids (SS), organic matters and chroma. In this work, an integrated process was proposed to treat the wastewater, which consisted of coagulation, anaerobic baffled reactor (ABR) and anoxic/aerobic-membrane bioreactor (A/O-MBR). The influences of coagulation conditions, ABR startup strategy and operation parameters (HRT, DO and temperature, etc.) on treatment effects were mainly investigated. The results showed that during the coagulation process (pH of 9.0-10.0 and PACl dosage of 350-450 mg·L^-1), the average removal rates of SS, chroma, total Cr and COD were 70.4%, 73.9%, 97.7% and 37.9%, respectively. Based on the strategy of stepped-loading, the ABR process startup was finished within 50 d, and after that a 68.2% of COD removal rate was achieved at the HRT of 20 h and temperature of 30℃. Through the optimizations of HRT (6 h) and DO (DO 2.0-3.0 mg·L^-1) in the A/O-MBR the removal rates of COD and NH₄-N were 67.7% and 81.3%, respectively. As a result, the final effluent quality well met the first class standard of DB 44/26-2001, demonstrating that the integrated process proposed in this paper was very promising to treat tanning wastewater.

Key words: tanning wastewater, coagulation, anaerobic baffled reactor(ABR), anoxic/aerobic-membrane bioreactor(A/O-MBR), hydraulic retention time(HRT)

摘要：

针对制革废水高悬浮物含量、高有机物浓度及高色度的特点，采用混凝/厌氧/兼氧-好氧膜生物反应器组合新工艺对其进行中试处理研究，重点考察混凝预处理的反应条件（pH、投药量等）、生物反应器的启动策略，以及水力停留时间（HRT）、溶解氧（DO）和水温等运行参数对制革废水处理效果的影响。结果表明：当混凝过程中pH为9.0～10.0，聚合氯化铝（PACl）投加量为350～450 mg·L^-1时，废水悬浮物浓度（SS）、色度、总铬和化学需氧量（COD）去除率的平均值分别为70.4%，73.9%，97.7%和37.9%；基于阶梯负荷启动策略，50 d左右完成联合厌氧折流板反应器的启动，厌氧环节在HRT为20 h、水温30℃左右的条件下能够去除68.2%左右的COD；通过对兼氧-好氧膜生物反应器中DO分布的研究和HRT的优化，该单元的COD和NH₄-N的平均去除率分别达到67.7%和81.3%（HRT 6 h，DO 2.0～3.0 mg·L^-1）。经过组合工艺的处理，系统出水各项主要指标（COD、NH4-N、SS、色度和总铬等）达到DB 44/26-2001一级排放标准，表明本文提出的新工艺在制革废水处理中具有良好的应用前景。

关键词: 制革废水, 混凝, 厌氧折流板反应器, 兼氧-好氧膜生物反应器, 水力停留时间

CLC Number:

X703

NIE Lijun, ZHONG Huawen, ZHOU Rujin, LIN Peixi, DENG Zecong, ZHAO Meitian, LIN Zhiwu. Treatment of tanning wastewater by integrated process consisted of coagulation, anaerobic baffled reactor and anoxic/aerobic-membrane bioreactor[J]. CIESC Journal, 2016, 67(9): 3995-4003.

聂丽君, 钟华文, 周如金, 林培喜, 邓泽聪, 赵美甜, 林志武. 混凝/厌氧/兼氧-好氧膜生物反应器组合新工艺处理制革废水[J]. 化工学报, 2016, 67(9): 3995-4003.

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