PAC混凝法去除煤化工废水中难降解组分及其可生化性提高研究  

STUDY OF REFRACTORY COMPOUNDS REMOVAL AND BIODEGRADABILITY IMPROVEMENT OF COAL-CHEMICAL ENGINEERING WASTEWATER BY PAC COAGULATION PRETREATMENT

作　　者：吴锦华[1] 方一莉 江燕斌[2] 盖恒军[3] 李平[1] 

机构地区：[1]华南理工大学环境与能源学院,广州510006 [2]华南理工大学化学与化工学院,广州510640 [3]青岛科技大学化工学院,山东青岛266042

出　　处：《环境工程》2017年第2期15-18,48,共5页Environmental Engineering

基　　金：国家科技支撑计划项目子课题(2014BAC10B01-3);中央高校基本科研业务费资助项目(2015ZZ047)

摘　　要：采用聚合氯化铝(polyaluminium chloride,PAC)和聚丙烯酰胺(Polyacrylamide,PAM)对煤化工废水进行混凝预处理,重点考察难降解组分的去除及可生化性的提高。在PAC和PAM投加量分别为2 g/L和1 mg/L、初始pH值为8的条件下,对抑制生物生长的色度组分和油类物质去除率分别可达97.3%和66.2%,对COD去除率也达到44.7%。紫外-可见光谱显示,难降解或对生物有抑制作用的苯酚、萘酚类芳香化合物及含共轭双键的多环、杂环化合物去除率分别达到56.1%和32.8%,ρ(BOD_5)/ρ(COD)由0.15提高至0.27。混凝出水经上流式厌氧滤池与气升环流好氧反应器处理后,ρ(COD)由2 600 mg/L降至103 mg/L,接近GB 8978—1996《污染综合排放标准》一级排放标准100mg/L的要求。因此,PAC混凝法可作为一种简便、高效的手段用于煤化工废水预处理过程。The coal-chemical engineering wastewater was pretreated by polyaluminium chloride（PAC） and polyacrylamide（PAM）,in which refractory compounds removal and biodegradability improvement was studied. The optimal operational condition was as follows： The dosage of PAC of 2 g/L,the dosage of PAM of 1 mg/L and initial pH value of 8. Under this condition,the removal rates of chroma and oils were 97. 3% and 66. 2%,respectively,the COD removal rate reached44. 7%. UV-vis absorption spectra indicated that the removal efficiency of refractory or toxic compounds such as phenol,naphthol aromatic compounds and conjugated double-bonded polycyclic and heterocyclic compounds were 56. 1% and 32. 8%,respectively. The biodegradability of the wastewater was significantly improved as the BOD5/COD ratio was increased from0. 15 to 0. 27. After the treatment with sequential upflow anaerobic filter and air lift reactor,the concentration of COD in coagulation effluent decreased from 2 600 mg/L to 103 mg/L,which was very close to the national first class emission standard of 100 mg/L. PAC coagulation was an effective and efficient method for the pretreatment of coal-chemical engineering wastewater.

关 键 词：煤化工废水 PAC混凝法 可生化性 

分 类 号：X784[环境科学与工程—环境工程]