利用混凝与苦草协同处理生活污水

Treatment of domestic sewage by coagulation and Vallisneria natans

利用化学絮凝与苦草生态净化协同处理生活污水,探究不同处理工艺对生活污水中氨氮、总氮、总磷、COD去除效果的影响。结果表明,采用PAC与PAM混凝处理生活污水效果显著,PAC与PAM的最佳投加量分别为195,1.2 mg·L-1,处理方法为:投加PAC后200 r·min-1先搅拌30 s,加入PAM后继续200 r·min-1搅拌30 s,再70 r·min-1搅拌8 min。在混凝的基础上进行苦草生态净化,建议种植密度为32 g·L-1,处理8 d后,对餐饮污水中氨氮、总氮、总磷和COD的去除效果最佳;相同的种植密度处理12 d时,对洗涤污水的净化效果最好。

The coagulation of polymerized aluminium chloride （ PAC ） and polyacrylamide （PAM） and Vallisneria natans were combined to treat the domestic sewage, and the removal efficiency of ammonia nitrogen, total nitrogen, total phosphorus and COD by different treatments was explored. It was shown that the combination of PAC and PAM was effective to treat domestic sewage. The optimum dosages of PAC and PAM were 195 and 1.2 mg.L-1 , respec- tively, and the optimum treatment procedures were as follows ： after the addition of PAC, sewage were stirred at 200 r. min-1 for 30 s. Then PAM was added, and the sewage was stirred at 200 r. min-1 firstly for 30 s, and then at 70 r. min- 1 for 8 min. Vallisneria natans was introduced for ecological purification after coagulation. Both in the catering and washing wastewater, the most effective purification appeared at a planting density of 32 g.L-1. And the best removal efficiency was achieved after 8 or 12 d treatment in the catering or washing wastewater, respectively.