基于鸟粪石法回收酱酒窖底水中氮磷的工艺研究OA

A novel resource recovery treatment process was proposed by coupling magnesium ammonium phosphate(MAP)precipitation with ceramic membrane separation to address the low efficiency and high costs of traditional treatment caused by the high organic load,high nitrogen and phosphorus contents,and high viscosity of pit bottom sewage from sauce-flavored liquor production.This study systematically investigated the effects of reaction pH,Mg/P molar ratio,and magnesium source dosing strategies on nitrogen and phosphorus recovery efficiency and precipitate purity,and evaluated the performance of ceramic membranes in enhancing the solid-liquid separation from a highly viscous media.Under the optimal conditions(pH 9.5,Mg/P=1.5,adjusted with NaOH and MgCl2),phosphate recovery exceeded 99.0%,and the recovered struvite achieved a purity of 92.2%after washing and drying.Ceramic membrane filtration not only exhibited efficient retention and separation of struvite precipitates,but also synergistically removed 27.6%of chemical oxygen demand(COD)and 46.6%of organic nitrogen from the filtrate.In addition,the residual liquid after nitrogen and phosphorus recovery achieved a specific denitrification rate of 12.21 mg·NO3-N·gVSS−1·h−1,which is comparable to that of sodium acetate.This residual liquid could serve as a high-quality alternative carbon source for municipal sewage treatment,further improving the utilization value of pit bottom water.These results provide theoretical insights and technical guidance for valorizing pit bottom sewage.