通过投加镁盐形成鸟粪石沉淀，污泥消化液中过量的氮磷得到去除和回收，以提高污泥消化液的碳氮比。
To increasing the ratio of carbon to nitrogen in the sludge fermentation liquid , the excess ammonia and phosphate was recovered by adding Mg2 + to form the deposition of strive .
盐石