两级完全混合发酵工艺开发碳源试验研究

采用两级完全混合发酵工艺进行碳源开发试验,研究了水力停留时间(HRT)和污泥停留时间(SRT)对工艺开发碳源效果的影响.研究表明,固定SRT为4d,污泥回流比为1,HRT在32~36h,系统出水的溶解性COD(SCOD)可维持在1090~1180mg/L,且浓缩池泥水分离效果较好,出水的SS保持在50~80mg/L.保持系统的HRT为32h,污泥回流比为1,SRT在4~7d时,可实现厌氧系统中产酸菌与产甲烷菌的分离,系统能够保持良好的产酸效果,此时系统出水的SCOD值基本稳定于980~1179mg/L.碱度可以作为衡量水解酸化系统是否有效运行的重要参数.HRT为32h,SRT为4d的工况下,初沉污泥酸化发酵系统对氨氮和磷的释放率分别为3.88 mgN/gVSS和0.27mgP/gVSS.

Developing carbon resource with two-stage complete mixing ferment process

Two-stage complete mixing ferment process was used for developing carbon source. Influence of HRT and SRT on the ferment system were studied. Effective HRT of the process was between 32 to 36 h, when SRT was 4 d and sludge recycle rate was 1, average SCOD of effluents was in the range of 1090~1180 mg/L, while separation effect of the sludge thickener was very well, and MLSS of supernatant was in the range of 50~80 mg/L; In the condition of HRT was 32 h and sludge recycle rate was 1, effective SRT of the process was in the range of 4~7d, and average SCOD of effluents was between 980~1179 mg/L, acidogenic bacteria and methanogenic bacteria could be separated effectively. Alkalinity was an important parameter of the primary sludge ferment system. In the process of primary sludge hydrolysis and acidification, ammonia nitrogen and phosphorus would be released. In the conditions of HRT was 32 h and SRT was 4 d, the release rate of ammonia nitrogen and phosphorus were 3.88 mgN/gVSS and 0.27 mgP/gVSS.