厌氧消化污泥的耐酸驯化培养

Acid Domestication of Anaerobic Digestion Sludge

为探寻一种合适的污泥驯化方法,快速提高餐厨垃圾厌氧消化系统的耐酸性和稳定性,提出对餐厨垃圾厌氧消化污泥进行分阶段耐酸驯化培养。试验分为两阶段进行,第一阶段(pH7.2～5.7),1#、2#、3#反应器的pH每次均降低0.5;第二阶段(pH<5.7),1#、2#、3#反应器的pH每次分别降低0.1,0.3和0.5。结果显示,第一阶段,3个反应器的总碱度、COD去除率和容积产气率变化相似;第二阶段,反应器1和反应器2变化总体相似,反应器3则明显不同。经过两阶段的驯化,1#、2#、3#反应器的耐酸值最终为4.1,4.0和4.7。采用逐级降低pH的方法对餐厨垃圾厌氧消化污泥进行耐酸驯化时,第一阶段(pH7.2～5.7)每次宜降低0.5,第二阶段(pH<5.7)每次宜降低0.3。

This paper proposed a two-phase acid domestication of anaerobic digestion sludge to explore a suitable domesticated method for rapidly improving the acid resistance and stability of a food waste anaerobic digestion system. In the first phase （pH 7.2--5.7）, pH was reduced by0.5 unit each time in Reactors #1 , #2 and #3. In the second phase （pHi5.7）, pH was reduced by 0.1, 0.3 and 0.5 unit each time respectively. The results showed that in the first phase, the ranges of the total alkalinity, the COD removal rate and the volume gas rate were similar in the three reactors. In the second phase, the related indicators of Reactors # 1 and # 2 were similar overall, while Reactor # 3 was obviously different from Reactor #： 1 and # 2. The final acid tolerant values in Reactor # 1, # 2 and # 3 are 4.1, 4.0 and 4.7 respectively. When the method of gradual reduction of pH was used for acid domestication of anaerobic digestion sludge, reduction by 0.5 pH unit each time was appropriate for the first stage （pH 7.2--5.7） and reduction by 0.3 pH unit each time was appropriate for the second stage （pHi5.7）.