A/O-混凝-BDD组合工艺处理垃圾渗滤液的研究: 参数优化

doi:10.13209/j.0479-8023.20175.044

摘要/Abstract

摘要：

研究组合工艺“A/O-混凝-BDD”对垃圾渗滤液中有机物和氨氮的处理效果, 优化各段工艺的运行参数。结果表明, 各工艺最佳运行条件: A/O 工艺水力停留时间(HRT)为 10.7 d, 回流比为3.5; 混凝剂工艺氯化铁为混凝剂, pH=5.5, 添加量为0.4 g/L; BDD工艺电流密度为60 mA/cm², 电极面积/反应体积为4 m^-1。最佳工艺条件下进、出水 COD_Cr 平均浓度分别为 13375 和60 mg/L, 去除率为99.5%; 进、出水 TOC 平均浓度分别为 6893 和 12 mg/L, 去除率为 99.8%。进、出水氨氮平均浓度分别为 1889 和 0 mg/L, 去除率为100.0%。A/O、混凝和 BDD 对 COD_Cr去除贡献分别为 59.0%, 32.9%和 7.6%, 对 TOC 去除贡献分别为50.5%, 46.1%和13.2%, 对氨氮去除贡献分别为84.3%, 2.5%和3.2%。

关键词: 垃圾渗滤液, A/O, 混凝, BDD, 有机质, 氨氮

Abstract:

Landfill leachate was treated by A/O-coagulation-BDD combined processes, and the operation parameters were optimized. The optimal HRT and sludge recirculation ratio was 10.7 days and 3.5 for A/O treatment process. Reaction pH and optimal dose of ferric chloride coagulation treatment was 5.5 and 0.4 g/L. The current density and A/V ratio (anode area/reaction volum) for best performance of BDD was 60 mA/cm² and 4 m^-1. COD_Cr concentration in raw leachte and final effluent were 13375 mg/L and 60 mg/L, with the removal efficiency of 99.5%. TOC concentration before and after treatment by combined treatment process were 6893 mg/L and 12 mg/L, with the removal efficiency of 99.8%. Ammonia nitrogen was completely removed by the combined treatment processes from 1889 mg/L to 0 mg/L. The contribution of A/O, coagulation, and BDD was 59.0%, 32.9%, and 7.6% for COD_Cr removal of total COD_Cr, was 50.5%, 46.1%, and 13.2% for TOC removal, was 84.3%, 2.5%, and 3.2% for ammonia nitrogen removal, respectively.

Key words: landfill leachate, A/O, coagulation, BDD, organic matter, ammonia nitrogen

单迎春, 王庆玮, 潘伟一, 石宛梓, 孙海美, 孙卫玲. A/O-混凝-BDD组合工艺处理垃圾渗滤液的研究: 参数优化[J]. 北京大学学报自然科学版, 2017, 53(3): 497-506.

Yingchun SHAN, Qingwei WANG, Weiyi PAN, Wanzi SHI, Haimei SUN, Weiling SUN. Treatment of Landfill Leachate Using A/O-Coagulation-BDD:Ⅰ. Parameter Optimization[J]. Acta Scientiarum Naturalium Universitatis Pekinensis, 2017, 53(3): 497-506.

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链接本文: https://xbna.pku.edu.cn/CN/10.13209/j.0479-8023.20175.044

https://xbna.pku.edu.cn/CN/Y2017/V53/I3/497

图/表 10

图1 A/O-混凝-BDD组合工艺流程

Fig. 1 Flow chart of A/O-Coagulation-BDD combined treatment processes

表1 深圳某垃圾填埋场渗滤液水质特点

Table 1 Characters of landfill leachate from landfill in Shenzhen

指标	波动范围	均值
COD_Cr/(mg·L^-1)	11025~24104	18234
TOC/(mg·L^-1)	5481~9485	7832
氨氮/(mg·L^-1)	1398~2308	1969
总氮/(mg·L^-1)	1335~2525	1991
总磷/(mg·L^-1)	6~20	13
电导率/(μs·cm^-1)	31200~45900	38909
pH	7.9~8.6	8.2

图2 A/O工艺水质指标随HRT的变化(污泥回流比=3.0)

Fig. 2 Changes of water quality in A/O treatment process at different HRT (sludge recirculation ratio=3.0)

图3 不同回流比时的A/O工艺水质(HRT=10.7 d)

Fig. 3 Water quality of A/O at different sludge recirculation ratios (HRT=10.7 d)

图4 不同混凝剂对A/O出水的处理效果(a)和不同剂量氯化铁下色度和pH的变化(b)

Fig. 4 Comparison of different coagulating agents (a) and changes of color and pH at different FeCl3 dosage (b)

图5 pH(a)和氯化铁添加量(b)对TOC和色度去除的影响

Fig. 5 Effect of pH (a) and FeCl3 dosage (b) on the removal of TOC and color

图6 pH对电解效果的影响

Fig. 6 Effects of pH on the efficiency of electrolysis

图7 电流密度对电解效果的影响

Fig. 7 Effects of current densities on the efficiency of electrolysis

图8 最优条件下BDD对TOC, COD和氨氮的去除效果

Fig. 8 Removal of TOC, COD and NH4+-N by BDD at optimum conditions

图9 各工艺对主要污染物的去除贡献

Fig. 9 Removal percentage of main polluted matters by three treatment methods

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