水稻秸秆添加对污水处理厂污泥好氧堆肥效果的影响

Effects of Rice Straw Addition on Aerobic Composting of Sludge from Sewage Treatment Plant

探讨污水处理厂污泥与水稻秸秆堆肥的最佳混合比,为水稻秸秆资源化提供理论参考。共设1.0∶0.5、1.0∶1.0、1.0∶1.5和1.0∶2.0这4组污泥和水稻秸秆比例,分别在第1、4、7天时测定各体系内含水率,pH、有机碳、总氮和总磷,同时记录每日堆肥温度变化。研究结果表明,污泥秸秆配比为1.0∶1.0和1.0∶1.5的体系含水率较好。温度均呈先升高再下降的趋势,其中1.0∶1.0配比下温度达到最高,为56.7℃。所有条件中pH变化均在适宜范围6.5~8.2。各体系有机碳含量均为下降,1.0∶1.0体系的降解速度最快,下降率为26.64%。总氮总体呈下降趋势,而总磷呈上升趋势。综合考虑,污泥与水稻秸秆比例为1.0∶1.0时最为适宜。

We discussed the optimal mixing ratio of sludge in sewage treatment plant and rice straw compost,which provided a theoretical reference for rice straw resource utilization.The ratios of sludge and rice straw in four groups of 1.0∶0.5,1.0∶1.0,1.0∶1.5 and 1.0∶2.0 were set in the experiment.The water content,pH,organic carbon,total nitrogen and total phosphorus in each group were measured at 1,4 and 7 days respectively,and the composting temperature changes were recorded daily.The results showed that the water contents in the system with the ratio of 1.0∶1.0 and 1.0∶1.5 were better.Temperature increased initially and then decreased,and the ratio of 1.0∶1.0 reached the highest temperature of 56.7℃.The pH change in all conditions was in the range of 6.5-8.2 appropriately.Organic carbon content of each system was decreasing,and the 1.0∶1.0 system was reduction maximally in all systems which was 26.64%.Total nitrogen decreased and total phosphorus increased in all conditions.Considering comprehensively,it is most suitable when the ratio of sludge to rice straw is 1.0∶1.0.