酸碱预处理对常压微波辐射剩余活性污泥磷释放的影响

考察了污泥酸、碱预处理在常压微波处理过程中对碳、氮、磷释放的影响.结果表明，NaOH预处理将污泥磷释放率从28.8%提高到59.1%，但同时引起了碳、氮的大量释放.同碱预处理相比，硫酸预处理能够将常压微波辐射作用下污泥磷的释放率提高3倍，达到84.5%，并可达到选择性释放碳、氮、磷的效果（氮和COD释放少，而磷释放显著），有利于后续的磷回收.优化试验表明，pH为2.1～2.2是常压微波辐射作用下污泥磷释放的最佳硫酸预处理条件.

Effect of Acid and Alkali on Phosphorus Release from Sewage Sludge in the Microwave Treatment Process

Impacts of acid and alkali addition on phosphorus release from sewage sludge were investigated in a microwave reactor at atmospheric pressure. Results showed that in the microwave irradiation process, though NaOH pretreatment increased the release efficiency of phosphorus from 28.8% to 59.1%, large amounts of carbon and nitrogen were correspondingly released into the supernatant. Compared to the alkali pretreatment, pretreatment of H₂SO₄ not only resulted in the higher release efficiency of phosphorus by 3 times (up to 84.5%), but also sharply reduced the amount of carbon and nitrogen released into the supernatant. These results suggest that H₂SO₄ pretreatment of sewage sludge can selectively release carbon, nitrogen and phosphorus, which is more suitable for phosphorus recovery from sewage sludge. Meanwhile, the pH range of 2.1-2.2 was optimal for phosphorus release from sewage sludge in the microwave treatment process.