不同环境温度下猪场沼液絮凝工艺参数的优化研究  

Optimization of flocculation process parameters of pig farm biogas slurry at different ambient temperatures

作　　者：方轲 王辉[1] 尹令实 FANG Ke;WANG Hui;YIN Ling-shi(College of Water Resource&Civil Engineering,Hunan Agricultural University,Changsha,Hunan 410128,China)

机构地区：[1]湖南农业大学水利与土木工程学院,湖南长沙410128

出　　处：《农业现代化研究》2024年第1期165-175,共11页Research of Agricultural Modernization

基　　金：湖南省战略性新兴产业科技攻关与重大科技成果转化项目(2020NK2003);国家自然科学基金项目(41471185)。

摘　　要：絮凝是一种高效、低廉的生猪养殖场沼液处理技术,其处理效果受环境温度影响显著。为深入研究环境温度对猪场沼液的絮凝效果及处理工艺参数影响,本研究通过室内模拟试验,优化了低温(2~9℃)、中温(11~17℃)和高温(29~36℃)3种环境温度条件下的絮凝工艺参数,并探寻最佳絮凝效果及最优工艺参数值。结果表明:随着环境温度升高,絮凝剂投加量及搅拌速度的最优取值越小,p H的最优取值越大;中温条件下的最佳絮凝效果优于低温和高温。3种环境温度条件下聚合氯化铝(PAC)投加量、聚丙烯酰胺(PAM)投加量、pH值和搅拌速度的最优值分别为,低温(7.24 g/L、96.91 mg/L、6.41、381.84 r/min),中温(5.12 g/L、77.61 mg/L、7.22、322.29 r/min),高温(2.93 g/L、21.99 mg/L、8.38、287.62 r/min),与原工艺相比,絮凝剂成本分别可降低6.57元/t、14.33元/t和20.88元/t。验证发现最优工艺对应的总磷、总氮和浊度去除率分别可达82.58%、86.81%和51.86%以上,研究结果可在不同环境温度条件下为猪场沼液絮凝处理工艺提供科学指导。Flocculation is an efficient and cost-effective technology for treating pig farm biogas slurry,with its effectiveness being significantly influenced by environmental temperature.In order to study the influence of ambient temperature on flocculation efficacy and processing parameters of biogas slurry in a pig farm,this study optimized the flocculation process parameters under three distinct temperature conditions(low:2~9℃,medium:11~17℃,and high:29~36℃)through indoor simulation tests,aiming to explore the best flocculation effect and optimal process parameter values.The results showed that with the increase in ambient temperature,the smaller the optimal value of flocculant dosage and stirring speed,as well as the larger the optimal value of pH;furthermore,the best flocculation effect was achieved under medium temperature conditions,surpassing those at low and high temperatures.The optimal values of the dosage of polyaluminum chloride(PAC),the dosage of polyacrylamide(PAM),the pH value,and the stirring speed under three ambient temperature conditions are as follows:low temperature(7.24 g/L,96.91 mg/L,6.41,381.84 r/min),medium temperature(5.12 g/L,77.61 mg/L,7.22,322.29 r/min),and high temperature(2.93 g/L,21.99 mg/L,8.38,287.62 r/min).Compared with the original process,the cost of flocculant can be reduced by 6.57 Yuan/t,14.33 Yuan/t,and 20.88 Yuan/t,respectively.It was verified that the removal rates of total phosphorus,total nitrogen,and turbidity corresponding to the optimal process could reach more than 82.58%,86.81%,and 51.86%.These findings provide scientific guidance for the flocculation treatment of pig farm biogas slurry under varying ambient temperatures.

关 键 词：猪场沼液 响应面法 絮凝 环境温度 工艺参数优化 

分 类 号：X713[环境科学与工程—环境工程]