电渗析工艺处理鸡粪沼液的小试和中试研究

Small test and pilot-scale test on treatment of chicken manure biogas slurry by electrodialysis process

以经过超滤处理后的鸡粪沼液为研究对象,采用电渗析工艺对其进行浓缩,研究了循环流量、电压、pH、膜的种类等因素对沼液中磷酸盐浓度和氨氮浓度的影响。通过Box-Behnken响应曲面法对反应条件进行优化,建立了基于磷酸盐和氨氮浓缩率的二次函数预测模型,具有较好的回归性。得到了实验室采用电渗析处理沼液的最佳工艺条件:循环流量为40 L/h、电压为14 V、pH为8、AlSL膜。中试总实验用水为5 m^(3),得到的中试最佳工艺条件为:电压120 V、pH 7.5、循环流量4 m^(3)/h。

Chicken manure biogas slurry after ultrafiltration treatment is concentrated by electrodialysis process,and the influences of circulating flow,voltage,pH,membrane type on the concentrations of phosphates and ammoniacal nitrogen are studied.The reaction conditions are optimized by means of Box-Behnken response surface method,and a quadratic function prediction model based on the concentrating rates of phosphates and ammoniacal nitrogen is established,which shows a good regression.The results indicate that the optimal conditions for treating with biogas slurry by electrodialysis are determined as follows:the circulating flow is 40 L·h^(-1),voltage is 14 V,pH is 8,and AlSL membrane is employed.The pilot test uses 5 m^(3)of water in total,and the optimal process conditions are as follows:voltage is 120 V,pH is 7.5,and the circulating flow is 4 m^(3)·h^(-1).