利用保水剂调节污泥发酵起始水分的研究

发布时间：2018-06-13 14:05

本文选题：生活污泥 + 好氧堆肥　；参考：《农业环境科学学报》2017年12期

【摘要】：为解决生活污泥资源化利用中好氧堆肥的水分过高问题,采用添加保水剂的方法对堆体的初始水分进行调节。试验将生活污泥和木屑按C/N为16∶1混合后,通过添加不同量的保水剂,设置成理论初始含水率分别为46%、54%、56%、58%和68%的5个处理。在堆肥过程中,对堆体温度、p H值、EC值、有机质、总氮、铵态氮、硝态氮以及产物的腐熟度指数(GI)等指标进行了测定。实验结果表明:通过添加保水剂调节污泥堆肥的起始水分含量对促进堆肥的好氧发酵过程是完全可行的;适宜的起始堆体含水率有利于发酵过程温度的升高和养分的转化,也有利于产品各项理化指标和养分指标的实现;根据原料和辅料的碳氮比确定混合配比后,可依据拟采用的保水剂在污泥中的吸水倍率,通过理论计算得到将混合原料起始含水率调整到适宜值时所需添加的保水剂量。根据本试验结果得出,在利用保水剂调节污泥堆肥起始水分时,将理论初始含水率设定在54%左右是较为合适的。
[Abstract]:In order to solve the problem of excessive moisture content in aerobic compost during the reuse of domestic sludge, the initial moisture content of the reactor was adjusted by adding water retention agent. After mixing domestic sludge and sawdust with C / N at 16:1, five treatments with theoretical initial moisture content of 46 ~ 54 ~ 5656 ~ (58%) and 68% ~ 68% were obtained by adding different amount of water retaining agent. In the process of composting, the values of EC, organic matter, total nitrogen, ammonium nitrogen, nitrate nitrogen and the maturity index of the product were determined. The results show that it is feasible to adjust the initial moisture content of sludge compost by adding water retaining agent to promote aerobic fermentation process of compost, and the suitable moisture content of initial reactor is beneficial to the increase of temperature and nutrient conversion during fermentation process. It is also beneficial to the realization of physical and chemical index and nutrient index of the product. After determining the ratio of carbon to nitrogen of raw material and auxiliary material, the ratio of water absorbent in sludge can be determined according to the absorbency of the water-retaining agent to be used. Through theoretical calculation, the amount of water-retaining agent needed to be added when the initial moisture content of mixed raw material is adjusted to the appropriate value is obtained. According to the results of this experiment, it is more appropriate to set the theoretical initial moisture content at about 54% when adjusting the initial moisture content of sludge compost by using water retaining agent.
【作者单位】：江苏省(扬州)农业环境安全技术服务中心;江苏省有机固体废弃物资源化协同创新中心;
【基金】：国家重大基础研究发展计划项目(2013CB127404) 国家自然科学基金项目(41301308,31272228,31000934)~~
【分类号】：S141.4;X703

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