联合NaOH和Ca(OH)_2强化剩余污泥厌氧发酵生产挥发性脂肪酸

Enhanced volatile fatty acids production from waste activated sludge anaerobic fermentation using combined NaOH and Ca(OH)_2

以剩余污泥为研究对象,在序批式厌氧反应器中探究了Na OH和Ca(OH)_2联合作用对污泥厌氧发酵产挥发性脂肪酸(VFA)的影响。结果表明,相较于Na OH单独发酵,Na OH和Ca(OH)_2的联合作用能够进一步促进VFA的积累,且Na OH和Ca(OH)_2的质量比例为50∶50时,VFA的最大积累量为286 mg COD·g-1VSS。机理研究表明,Na OH和Ca(OH)_2联合作用能够促进污泥溶解过程,并且溶解性COD(SCOD)的最大含量为3 650 mg·L^(-1),同时Na OH和Ca(OH)_2联合作用能够促进胞外聚合物内部有机物向外部的转移。Na OH和Ca(OH)_2联合作用能够进一步遏制产甲烷古菌的活性,甲烷的最大积累量为165 m L,远小于Na OH单独影响下甲烷的积累量。研究结果对指导污泥厌氧发酵回收能源物质具有一定的指导意义。

The combined effects of NaOH and Ca （OH）： on the volatile fatty acids （VFA） production from sludge anaerobic fermentation were investigated in the anaerobic reactor with waste activated sludge as the re- search object. The results showed that the combined effect of NaOH and Ca（OH） 2 can further promote the accu- mulation of VFA and the mass ratio of NaOH and Ca （OH） 2 is 50 ： 50, the maximal accumulation of VFA was 286 mg COD · g-1VSS. Mechanism studies suggested that the combined effect of Ca（OH）2 and NaOH could ac- celerate the sludge dissolution process, and the maximal content of soluble COD （SCOD） was 3 650 mg· L-1, and NaOH combined with Ca（OH） 2 could also promote the transformation of organic matter in extracellular poly- mer from inside to outside. In addition, the combination of NaOH and Ca（OH）2 could further inhibit the activi- ties of methane archaea, and the maximal accumulation of methane was 165 mL, which was much lower than that of NaOH alone. The results of this study have some guiding significances for directing the anaerobic fermentation of sludge for energy recovery.