氮磷无机化反应器应用于农村生活污水资源化预处理工程示范

Engineering Project Demonstration of Nitrogen-Phosphorus Inorganic Reactor Applied in Pretreatment for Reclamation of Rural Domestic Sewage

为改变农村生活污水传统的"处理"模式,实现资源化利用,针对污水直接灌溉存在的土壤退化及植物烂根等隐患,在安徽农村地区构建25 t/d的新型一体化氮磷无机化反应器(SNPIR)示范工程对农村生活污水进行处理。分别对厌氧池和短程好氧生物滤池在不同季节的关键运行参数进行优化研究,在此基础上,考察不同季节SNPIR的氮磷无机化效能及大肠杆菌指标。试验结果表明:SNPIR分别在不同季节对应的最适宜条件下运行,平均有机氮无机化率(ηN)达到24%~32%,平均有机磷无机化率(ηP)达到86%~96%,均能为后续资源化利用提供无机氮肥、磷肥。除冬季外,夏、秋季反应器出水CODCr浓度均能达到《农田灌溉水质标准》(GB 5084-2005)中CODCr指标的最高限制要求(50mg/L),各季节粪大肠菌群数量符合该标准中相应要求的概率为95.9%,可为农村生活污水的资源化利用提供参考和理论依据。

There were some hidden dangers in direct sewage irrigation,such as soil degradation and root rot.In order to change the traditional atreating"mode of rural domestic sewage and to realize resource utilization,the 25 tons per day integrated short-range nitrogen-phosphorus inorganic reactor(SNPIR)demonstration project was proposed in rural areas of Anhui Province.The key operational parameters of anaeroblc and aerobic filters in different seasons were optimized.On the basis of this,the nitrogen and phosphorus mineralization efficiency and E.coli index of SNPIR in different seasons were studied.The experimental results showed that when SNPIR operated under the most suitable conlitions in different.seasons,the average organic nitrogen mineralization rate(η_N)reached 24%~32%,and the average organic phosphorus mineralization rate(t7 p)reaches 86%~96%,which could provide inorganic nitrogen fertilizer and phosphate fertilizer for subsequent resource utilization.Except for winter,the CODCr concentration of the effluent in the summer and autumn reactors was below 50 mg/L,which met the highest limit of COD index of Standars For Irrigation Water Quality(GB5084-2005).In each season,the probability that the number of fecal coliforms met the corresponding requirements in this standard was 95.9%.It can provide reference and theoretical basis for the resource utilization of rural domestic sewage.