不同氮源对猪粪废水厌氧发酵中氨抑制效果的影响  

Ammonia inhibition effect of different nitrogen sources in anaerobic fermentation of swine manure wastewater

作　　者：张寓涵 潘云霞[1] 贺亚清 刘思琪 ZHANG Yuhan;PAN Yunxia;HE Yaqing;LIU Siqi(College of Engineering and Technology,Southwest University,Chongqing 400715,China)

机构地区：[1]西南大学工程技术学院,重庆400715

出　　处：《环境工程学报》2020年第4期955-962,共8页Chinese Journal of Environmental Engineering

基　　金：中央高校基本科研业务费重点项目(XDJK2017B059);重庆市社会事业与民生保障科技创新专项项目(cstc2017shmsA20018)。

摘　　要：为明确不同氮源在猪粪废水厌氧发酵过程中的氨氮释放规律及其对厌氧发酵的抑制作用,以尿素和氯化铵为外加氮源,以固液分离后的猪粪废水为底物,在中温35℃条件下通过批式厌氧发酵,研究了不同总氨氮(total ammonia nitrogen, TAN)浓度的外加氮源对猪粪废水厌氧发酵的影响。结果表明:在猪粪废水厌氧发酵过程中,以尿素为氮源产生的游离氨(free ammonia nitrogen, FAN)、挥发性脂肪酸(volatile fatty acids, VFAs)和pH均明显高于以氯化铵为氮源的处理组,但二者对应的总氨氮(total ammonia nitrogen, TAN)没有明显的区别;以尿素为氮源(TAN≤500 mg·L-1)和以氯化铵为氮源(TAN≤1 500 mg·L-1)均能促进猪粪废水厌氧发酵产甲烷,但超过这一浓度后,均对产甲烷有抑制作用,尿素对猪粪废水厌氧发酵产生抑制的浓度(TAN>500 mg·L-1)远低于氯化铵(TAN>1 500 mg·L-1);相较氯化铵,以尿素为氮源对猪粪废水的厌氧发酵具有更强的氨抑制。以上结果可为高氨氮抑制厌氧发酵氮源的选择提供参考。In order to understand the ammonia nitrogen release and its inhibition on the anaerobic fermentation of swine manure wastewater with different nitrogen sources, the batch experiments of mesophilic anaerobic fermentation at 35 ℃ was conducted to study the effects of nitrogen addition with total ammonia nitrogen(TAN) concentration on the anaerobic fermentation of swine manure wastewater, in which urea and ammonia chloride were used as external nitrogen sources, respectively, swine manure wastewater after solid-liquid separation treatment was used as a fermentation substrate. The results showed that during the anaerobic fermentation process of swine manure wastewater, the free ammonia nitrogen(FAN) and volatile fatty acids(VFAs) contents, as well as pH when urea was an external nitrogen source were significantly higher than those when ammonia chloride was an external nitrogen source, but the TAN concentration had almost no significant difference. The extro-nitrogen source of urea(TAN≤500 mg·L-1) or ammonium chloride(TAN≤1 500 mg·L-1) could promote methane production during anaerobic fermentation of swine manure wastewater, but methane production could be inhibited when urea or ammonium chloride concentration exceeded above critical value. Ammonia inhibitory concentration of urea on anaerobic fermentation of swine waste water(TAN>500 mg·L-1) was much lower than that of ammonium chloride(TAN>1 500 mg·L-1). Compared with ammonia chloride, urea as nitrogen source resulted in stronger ammonia inhibition on anaerobic fermentation of swine manure wastewater. This study provides a theoretical basis for nitrogen source selection during anaerobic fermentation under high ammonia nitrogen inhibition conditions.

关 键 词：氯化铵 尿素 猪粪废水 厌氧发酵 氨抑制 

分 类 号：X703[环境科学与工程—环境工程]