摘要
采用壳聚糖三元接枝高分子絮凝剂(CAS)与聚合氯化铝(PAC)、磷酸镁铵沉淀法(MAP法)复配处理中山市老虎坑垃圾渗滤液生化处理出水。絮体粒径分布测试、絮体形态结构分析和Zata电位测定结果表明,CAS与PAC复配,可充分发挥CAS架桥和PAC电荷中和的协同作用,强化混凝过程,使细小的凝聚体形成体积庞大的絮状沉淀物,并在沉降过程中,网捕水体中的胶体颗粒,显著提高混凝效果。CAS和PAC的投加对NH4+-N脱氮的贡献甚微。采用MAP法与CAS、PAC复配,当投加量分别为50mg/LCAS、500mg/LPAC、856mg/LMgCl2·6H2O、1509mg/LNa2HPO4·12H2O时,出水COD、色度分别小于300mg/L、30倍,NH4+-N降至2mg/L左右。
The effluent from Laohukeng （China） Landfill Leachate Treatment Plant was treated by modified chitosan （CAS）, poly aluminum chloride （PAC）, MgCl2 · 6H2 O, and Na2 HPO4·1212H2O. It was found that combined use of CAS and PAC produced a synergistic effect （i. e. the flocculating and bridging of CAS and charge neutralization of PAC were co-functioned）. The best dosage of CAS, PAC, MgCl2·6H2O, and Na2HPO4·12H2O was 50 rag/L, 500 mg/L, 856 mg/L, and 1 509 mg/L respectively. After being treated, the COD, NH4^＋-N and color value of the leaehate was less than 300 mg/L, 2 mg/L, and 30, respectively. NH＋-N in the leaehate was removed in the form of MgNH4 PO4 by MgCl2· 6H2O and Na2 HPO4 ·12H2O. The particle diameters measurement results indicated that using CAS and PAC together facilitated the formation of large floes. Microscope photographs also showed that the floes were more cross-grained and erassitude which meant more efficient treatment.
出处
《环境污染与防治》
CAS
CSCD
北大核心
2006年第10期744-747,共4页
Environmental Pollution & Control
