光合菌与小球藻联合处理剩余污泥破解液优化研究

OPTIMIZATION STUDY ON DEGRADATION OF DISINTEGRATED EXCESS SLUDGE FILTRATE BY COMBINED PHOTOSYNTHETIC BACTERIA AND CHLORELLA

为提高剩余污泥破解液降解效果,采用光细菌(photosynthetic bacteria,PSB)和小球藻处理污泥破解液,考察PSB浓度、小球藻浓度及光照强度对处理效果的影响,并采用响应面法,确定PSB浓度、小球藻浓度及光照强度的最优参数。实验结果表明:随着PSB或小球藻浓度的增加,处理效果提高,最终溶解性化学需氧量(soluble chemical oxygen demands,SCOD)去除率可达80%以上;随着光照强度的提高或处理时间的延长,处理效果有所改善,最终SCOD去除率达到86%;以SCOD减少量为响应值,当PSB和小球藻浓度为10%,光照强度为1 500 lux时,SCOD减少量最大,达到1 121.33 mg/L。光照条件下PSB与小球藻联合具有良好的污泥破解液处理效果。

To improve the degradation effect of disintegrated excess sludge filtrate,the photosynthetic bactria( PSB) and chlorella were used to degrade the disintegrated excess sludge filtrate. The single factor' s influence of PSB concentration,chlorella concentration and illumination intensity on degradation effect was investigated. The response surface method was adopted to determine the optimal parameters of PSB concentration,chlorella concentration and illumination intensity. The results showed that the degradation effect was improved by the increasing of PSB concentration,and chlorella concentration and the final removal efficiency reached 80% above. The degradation effect was also enhanced by the increasing of illumination intensity and the extension of illumination time. The final removal efficiency arrived 86%. With the response value of SCOD,the response surface method calculated that the optimal illumination intensity was 1 500 lux. Under the optimal operation parameters,the SCOD decrement was 1 121. 33 mg/L. The combined PSB and chlorella under illumination was an effective method to degrade the disintegrated excess sludge filtrate.