温度对厨余垃圾和人粪尿污水混合液的水解酸化影响

Temperature Influence on Hydrolysis and Acidogenesis of Kitchen and Toilet Waste Mixture

文章考察了4个温度条件(25℃,35℃,45℃,55℃)对厨余垃圾和人粪尿污水混合液水解酸化的影响。结果表明:水解36 h后,温度越高,水解液中氨氮浓度越高,至96 h,55℃处理氨氮浓度达到1700 mg.L-1;不同温度条件下,水解酸化速率不同,VFA的产量也不同,45℃,55℃的VFA产生速率较快,24 h便达到最高峰,分别为101.7 mmol.L-1和78.5 mmol.L-1,但VFA最大产量在35℃处理96 h获得,达到139.8 mmol.L-1;35℃处理混合液MLSS降解率最高为30.44%,但对粪大肠菌群无灭杀作用,55℃温度下粪大肠菌群去除率最高,去除率达99%。以上结果表明,35℃是厨余垃圾和家庭污水混合液酸化水解的最佳温度,但要解决后续灭菌消毒的问题。

Influence of different temperature（25℃,35℃,45℃ and 55℃） on hydrolysis and acidogenesis of the mixture of kitchen waste and toilet waste were studied.The results showed that the NH＋4-N concentration increased with the temperature increase after 36 h hydrolysis,and the NH＋4-N was up to 1700 mg·L-1 after 96 h hydrolysis under 55℃.The hydrolysis rate and VFA content were different with temperature.The peak of VFA content were reached only after 24 h reaction at 45℃and 55℃,which were 101.7 mmol·L-1 and 78.5mmol·L-1 respectively.However,the maximum VFA content was 139.8 mmol·L-1 at 35℃ after 96 h reaction.The highest suspended solid（SS） degradation rate was 30.44% at 35℃ with no removal efficiency of fecal coliform.And the highest fecal coliform removal rate was 99% at 55℃.The above results showed that the optimal temperature for hydrolysis and acidogenesis of kitchen wastes and toilet wastes mixture was 35℃,but the post-disinfection treatment was needed..