干清猪粪半干法厌氧发酵关键技术参数优化

Optimization of Key Fechnical Parameters of Fresh Pig Dung

为解决干清猪粪的污染问题,实现规模化猪场干清粪污水的无害化、资源化利用,通过干清猪粪进行半干法厌氧发酵试验,并对其关键技术参数进行了优化,确定了一种适用于干清猪粪半干法厌氧发酵产沼气的工艺。通过对发酵系统的接种物比例、搅拌方式等进行研究,得到的结果表明:发酵温度设为中温35℃,接种比例为50%时,干清猪粪的厌氧产沼气效果最好,原料产气率可达471.4 mL·g^(-1)TS;在不同搅拌参数对干清猪粪厌氧发酵影响试验中,当搅拌间隔2 h,搅拌转速为30 r·min^(-1),搅拌时长为4 min的条件下,干清猪粪半干法厌氧发酵产沼气效果较好。研究表明,干清猪粪半干法厌氧发酵具有节水节能的优点又具备良好的产沼气能力可获得清洁能源,对干清猪粪的资源化利用有很好的指导意义,并对指导工程实践也具有重要意义。

In order to solve the pollution problem of fresh pig dung and realize the harmless and resource utilization of large-scale pig farm,this paper carried out semi-dry anaerobic fermentation test of fresh pig dung and optimizes the key technical parameters,and determines a process suitable for anaerobic biogas production of fresh pig dung.By studying the proportion of inoculants and mixing method of the fermentation system,the results show that the fermentation temperature is 35℃,and the inoculation ratio is 50%,the anaerobic biogas yield of fresh pig dung is the best,and the raw gas yield can reach 471.4 mL·g^(-1)TS.In the test of anaerobic fermentation of different mixing parameters,when the mixing speed is 30 r·min^(-1)and the stirring time is 4 min.The study shows that the semi-dry anaerobic fermentation of fresh pig dung has the advantages of water saving and energy saving and has a good biogas production capacity to obtain clean energy,which has a good guiding significance for the resource utilization of fresh pig dung,and is also of great significance for guiding the engineering practice.