中文摘要：

在35℃和pH=10的条件下,考察剩余污泥在NaOH,Na3PO4,NaOH＋Na3PO4碱性条件下水解和产酸性能,以及剩余污泥发酵液中氨氮和正磷酸盐的回收情况,并计算回收剩余污泥中碳源和氮磷元素的成本。研究结果表明：剩余污泥在这3种碱性条件下具有较为相近的水解和产酸能力。但在NaOH＋Na3PO4碱性条件下,剩余污泥发酵液中的磷酸盐和氨氮的摩尔比最接近1：1,因此最适合以磷酸铵镁沉淀的方式回收。使用NaOH＋Na3PO4控制污泥的pH发酵,回收发酵液中的氨氮和正磷酸盐的效果与NaOH碱性条件下的相当,但剩余污泥中碳源和氮磷元素的回收成本在3种碱性条件下最低。因此,使用NaOH＋Na3PO4控制剩余污泥pH发酵,可以优化回收剩余污泥中碳源和氮磷元素的过程。

英文摘要：

The hydrolysis and acidification of waste activated sludge were investigated under three types of alkaline conditions,i.e.NaOH,Na3PO4and combination of NaOH and Na3PO4.Temperature and pH were controlled at 35 ℃ and 10 respectively for all alkaline conditions investigated.Then the recovery of ammonia and phosphorus from the three types of alkaline fermentation liquid was conducted.Finally,the cost for recovering carbon source,ammonia and phosphorus was checked.The results show that the hydrolysis and acidification abilities of WAS under the three types of alkaline conditions are similar.Whereas,the molar ratio of phosphorus and ammonia is close to 1：1 under the alkaline condition which is controlled by combination of NaOH and Na3PO4,which benefits ammonia and phosphorus recovery in the form of struvite.The ammonia and phosphorus recovery efficiencies are equivalent when pH values are controlled by NaOH and combination of NaOH and Na3PO4.However,the cost for recovering carbon source,ammonia and phosphorus is the least when pH is controlled by combination of NaOH and Na3PO4.The process of recycling carbon source,phosphorus and ammonia from waste activated sludge can be optimized by fermenting waste activated sludge at the combination of NaOH and Na3PO4condition.