基质投加方式对污泥碱性发酵性能的影响  

The effect of substrate adding method on performance of sludge alkaline fermentation

作　　者：金宝丹[1] 王淑莹[1] 邢立群[1] 彭永臻[1] 

机构地区：[1]北京工业大学北京市污水脱氮除磷处理与过程控制工程技术研究中心北京市水质科学与水环境恢复工程重点实验室,北京100124

出　　处：《中国环境科学》2015年第10期3010-3017,共8页China Environmental Science

基　　金：国家自然科学基金(51178007);北京市教委资助项目;第十三届研究生科技基金资助项目(ykj-2014-10608)

摘　　要：为了研究低温条件(15±2)℃下投加方式对剩余污泥碱性发酵的影响,将剩余污泥分别在Na OH、KOH、Ca(OH)2和混合碱(Ca(OH)2和KOH)4种碱性(p H=10±0.2)系统中进行发酵,并在系统稳定后依次改变污泥投加方式(1次投加污泥、平均2次投加和平均3次投加),分别对发酵体系的剩余污泥溶液化、溶解性蛋白质、溶解性多糖、挥发性脂肪酸(SCFAs)和关键酶(水解酶和辅酶420(F420))进行研究.研究发现,4种碱性发酵体系中,不同投加方式对剩余污泥的水解和酸化性能具有显著的影响,其中SCOD随着污泥投加次数的增加略有减小,但是发酵液中可溶性的蛋白质和多糖有增加趋势.水解酶活性随着污泥投加次数的增加而降低,但是在Na OH和KOH发酵体系中,辅酶420随着投加次数的增加而增大,混合碱发酵体系中其活性基本不变,而在Ca(OH)2发酵体系中其活性则降低.Na OH、KOH和混合碱发酵体系产酸能力随投加次数的增加而下降,但是Ca(OH)2发酵体系酸化能力则先增大后少量降低,由此发现,Ca(OH)2发酵体系水解及产酸能力较为稳定,同时该体系中乙酸/SCFAs最大,高于其他发酵体系的10%左右.In order to study the effect of adding method on the waste activated sludge（WAS） alkaline fermentation in the low temperature（15±2）℃. The WAS were fermented in the Na OH, KOH, Ca（OH）2 and mixed alkalis fermentation systems（p H=10±0.2）, and changed the dosing method of WAS after the fermentation system stability（a dosing, average two dosing, average three dosing）. Dissolution of organic matters, short volatile fatty acids（SCFAs）, soluble protein, soluble polysaccharide and key enzyme（hydrolase and coenzyme 420） were analyzed during sludge anaerobic fermentation process. The acetic acid in the SCFAs was also observed. The batch-mode results showed that the dosing method had a significant impact on performance of the hydrolysis and acidification. The soluble chemical oxygen demand（SCOD） decreased with WAS dosing times, where soluble protein and polysaccharide increased. The hydrolytic enzyme decreased with WAS dosing times. However, the coenzyme420 increased in the Na OH and KOH conditions, remained about the same in the mixed alkali condition, declined in the Ca（OH）2 condition. The activity of acidification declined with WAS dosing times in Na OH and KOH conditions, but the SCFAs increased in average two dosing and decreased in the average three dosing in the Ca（OH）2 condition. Acidification performance was stable relatively in the Ca（OH）2condition and the proportion of acetic acid in SCFAs was the optimal which was higher 10% comparing with other conditions.

关 键 词：碱性发酵 投加方式 水解酶 辅酶420 碱类型 

分 类 号：X703[环境科学与工程—环境工程]