利用厌氧消化技术处理病死猪的工程应用

Case study on disposal of dead pigs using anaerobic digestion

病死猪的无害化处理是大型养猪场面临的一大难题,该文以天津某生猪养殖场沼气工程为例,通过监测发酵原料中加入病死猪前后的沼气工程运行情况,探讨了利用厌氧消化技术处理病死猪的可行性问题。该工程日处理TS为3%的粪污约500 m^3,处理猪场病死猪20~30头,鲜重为1.0~1.5 t。通过监测发现,病死猪作为发酵原料与猪粪污水混合后,系统运行稳定。与纯猪粪污水发酵相比：沼气日均产气量没有明显变化;沼气中甲烷含量提高约9%,达到67%左右;而沼气中硫化氢含量高出近一倍,达到0.67%左右,通过生物脱硫技术可降至0.01%左右。混合原料的发酵残渣经固液分离,沼渣中有机质含量为67.4%、总养分含量为12.6%,均高于国家有机肥标准。

The harmless disposal of dead pigs was a big problem faced by the large-sized pig farms. Taked the biogas engineering in Tianjin as an example, this paper discussed the feasibility of dead-pig disposed via the way of anaerobic digestion by monitoring the biogas engineering running data after and before adding dead pigs in the biogas fermentation materials. The biogas plant disposed about 500 m3 wastewater with 3% TS and 20~30 dead pigs about 1.0~1.5 t every day. It was found that biogas fermentation system ran steadily after adding dead pig to wastewater as mixed material. Compared to fermentation with wastewater alone, the mixed material fermentation had following characteristics： there was no obvious change for average daily production of biogas;methane content in biogas increased by 9% and reached an average of 67%;hydrogen sulfide content in biogas nearly doubled, reached about 0.67% which could drop to 0.01% through biological desulfurization technology. After solid-liquid separation of mixed fermentation residue,the content of organic in biogas residue can be up to 67.4% and the total nutrient content can be as high as12.6%, which were both higher than the national organic fertilizer standard.