臭氧灭菌技术处理猪场沼液粪大肠菌群的应用研究

Ozone Sterilization Technology Treating Fecal Coliform in Biogas Slurry

沼液是沼气工程发酵后的产物,可作为肥料在大田中消纳,但中国大部分猪场缺乏足够的土地用于沼液的贮存和消纳。文章重点研究利用臭氧灭菌技术杀灭沼液中的粪大肠菌群,使经过处理的沼液中粪大肠菌群数降低至可接受的水平,达到回冲猪舍标准,节约水资源同时实现沼液二次利用的目标。研究结果表明,当臭氧溶水浓度达5 mg·L-1时,灭菌率增长迅速,且灭菌效果与臭氧溶水浓度之间存在滞后现象。采用5 g·h-1和20 g·h-1的臭氧发生器分别处理20 L和50 L沼液,作用60 min后,可分别杀灭沼液中95.74%和75.93%的粪大肠菌群。该研究可为沼液的无害化处理提供参考。

Biogas slurry is the product of biogas engineering after fermentation, which could promote crop growth and con- trol disease in the field of agricultural production. But most of the large scale biogas engineering are lack of land to accept the biogas slurry in China. It was focused in this paper on the using of ozone sterilization technology to kill the fecal coli- form in biogas slurry so that the treated biogas slurry could meet the water requirement for pig house flushing. The results showed that the sterilization rate increased rapidly when the ozone solute was up to 5 mg ·L^-1, and there was a hysteresis phenomenon between the sterilization efficiency and ozone solute concentration. Adopting S g ·h^-1 ozone generator treating 20L of biogas slurry for 60 rain obtained 95.74% of sterilization efficiency, and it was 75.93% when 20 g ·h^-1 ozone generator adopted treating 50 L of biogas slurry for 60 min.