摘要
采用厌氧水解／膜生物反应器（MBR）组合工艺处理电镀废水，在保证有机物去除率的条件下强化脱氮处理，研究组合工艺的参数优化及冲击负荷（重金属和特征有机物）对工艺的影响。结果表明，厌氧水解／MBR组合工艺的最佳运行条件为：水解反应器和MBR的HRT分别为5和9h，MBR曝气量为13．8—16．6L／min，硝化液回流比为150％。在最佳条件下组合工艺运行稳定，出水水质可达一级A排放标准。组合工艺的抗冲击负荷能力较强，受冲击条件下的污染物去除率优于单独的MBR。两种工艺的对比研究发现，污染物去除率的差异随冲击负荷量的增加而增大，重金属冲击时尤为明显，当重金属浓度为20mg／L时，组合工艺对COD和氨氮的去除率仍分别可达75％和45％。组合工艺受特征有机物冲击的影响较小，说明在一定有机物冲击负荷下其可稳定去除污染物，确保出水水质达标排放。
The combined process of anaerobic hydrolysis and MBR was used to treat electroplating wastewater. By enhancing nitrogen removal under the condition of ensuring the removal efficiency of or- ganic compounds, the parameters optimization of the combined process and the resistance to shock load （including heavy metals and typical organic compounds） were studied. The results indicated that the op- timal parameters of the combined process were as follows： the HRTs of the hydrolysis reactor and MBR were 5 h and 9 h respectively, the aeration rate of MBR was 13.8 to 16.6 L/min and the recycle ratio of mixed liquid was 150%. Under the optimum parameters, the combined process operated stably, and the effluent could meet the first level A criteria specified in the national discharge standard. The combined process showed stronger anti-shock load capab processes demonstrated that the larger difference ility than single MBR. Comparative study on the two of pollutants removal occurred on higher shock load con-centration, especially with heavy metals as impact load. When heavy metals concentration was 20 mg/L, the removal efficiencies of COD and ammonia by the combined process could reach 75% and 45% respectively. The shock of characteristic organic compounds had little effect on the combined process. The combined process could remove pollutants stably at a certain extent of shock loading of organic compounds so that the effluent could meet the discharge standard.
出处
《中国给水排水》
CAS
CSCD
北大核心
2016年第11期11-15,共5页
China Water & Wastewater
基金
国家水体污染控制与治理科技重大专项(2013ZX07201007-003-002-04)
关键词
水解
MBR
电镀废水
冲击负荷
hydrolysis
MBR
electroplating wastewater
shock load
