城市有机废弃物厌氧发酵沼液絮凝处理及其肥效研究

Flocculation treatment of organic municipal wastes anaerobic fermentation slurry and its fertilizer effect

文章利用聚合氯化铝(PAC)和聚丙烯酰胺(PAM)对厌氧发酵沼液进行絮凝处理,以絮凝率和COD去除率为评价指标,在单因素试验基础上,采用Box-Behnken响应面法,研究PAC投放量、PAM投放量和沼液pH值对絮凝率和COD去除率的影响,并建立数学模型,获得沼液处理的最优条件,最后开展沼液肥效的研究。研究结果表明:当沼液的pH值为6.92,PAC的投放量为912 mg/L,PAM的投放量为21.36 mg/L时,沼液絮凝率和COD去除率达到最大,分别为47.96%和45.1%,总氮去除率为51.1%,总磷去除率为44.3%,氨氮去除率为60.3%;处理后的沼液在低浓度下可促进辣椒幼苗的生长,而未处理的沼液对辣椒幼苗的生长有很强的抑制作用。

The digested slurry was treated with polyaluminium chloride(PAC)and polyacrylamide(PAM).The digested slurry flocculation ratio and COD removal ratio were used as evaluation indexes.Based on the single factor test,the Box-Behnken response surface method was used to study the effects of PAC dosage,PAM dosage and pH of the digested slurry on flocculation ratio and COD removal ratio,and established a mathematical model to obtain optimal conditions for the slurry treatment,then tested the fertilizer effect.The results showed that when the pH was 6.92,the dosage of PAC was 912mg/L,and the dosage of PAM was 21.36mg/L,the flocculation ratio and COD removal ratio reached the maximum,which were 47.96%and 45.1%,respectively.The total nitrogen removal ratio was 51.1%,the total phosphorus removal ratio was 44.3%,and the ammonia nitrogen removal ratio was 60.3%.The treated slurry can promote the growth of pepper seedlings at low concentration,while the untreated slurry has a strong inhibitory effect on the growth of pepper seedlings.