复配絮凝剂处理养殖废水中的氨氮及总磷OACSTPCD

Ammonia nitrogen and total phosphorus in aquaculture wastewater was treated with combination of flocculants,polyferric sulfate(PFS),polyaluminum ferric sulfate(PAFCS),and anionic,cationic,and non-ionic polyacrylamides(APAM,CPAM,NPAM)as coagulants in the study.Firstly,the removal effect of a single flocculant was compared and analyzed,and then the compound coagulation test was carried out to select the best combination and dosage.The response surface method was used to optimize the flocculation conditions of the combination with the best treatment effect.The results showed that PFS+NPAM was the optimal combination,and its removal effect was significantly higher than that of a single flocculant.When the dosage of PFS and NPAM was 1 500 mg/L and 8 mg/L respectively,ammonia nitrogen and total phosphorus were removed effectively,and the removal rate was(73.81±0.20)%and(93.57±0.30)%respectively.The removal effect was obviously improved after the optimization of flocculation conditions.When the initial pH value was 7.0,the temperature was 35℃,and the stirring time lasted for 10 min,the removal rate of ammonia nitrogen and total phosphorus reached to 79.15%and 96.50%respectively,and the wastewater discharge shall meet the Pollutant Discharge Standard of Livestock and Poultry Industry(GB 18596-2001).