微波辐射作用下城市污水处理厂污泥的氮磷释放特性

实验考察了常压和不高于100℃条件下城市污水处理厂污泥在微波辐射作用下的氮、磷释放特性. 结果表明，微波辐射可迅速将污泥中的氮、磷释放到液相中，且不需投加任何化学药剂. 当微波输入能量相同时，随污泥浓度提高，微波处理后污泥上清液中的氮、磷浓度均提高. 与低功率微波辐射相比，高功率微波辐射能更为迅速地将污泥中的氮、磷释放出来. 微波功率为900 W时仅用时100 s，污泥上清液中的总磷及总氮浓度分别从处理前的2.05和19.58 mg/L迅速提高到31.46和115.10 mg/L.

Release of Nitrogen and Phosphorus from Sewage Sludge Pretreated by Microwave Irradiation

Release of nitrogen and phosphorus from sewage sludge produced by a municipal waste water treatment plant was investigated in a microwave reactor under atmospheric pressure and T≤100℃. Phosphorus and nitrogen in the sludge were rapidly released into the supematant in the microwave irradiation process without any chemical agent addition. Under the same input of microwave energy, the concentrations of phosphorus and nitrogen in the supematant after microwave irradiation were increased along with the increase of sludge concentration. The higher the microwave power, the faster the release of phosphorus and nitrogen. The concentrations of total phosphorus and total nitrogen in the supematant increased from 2.05 and 19.58 mg/L before treatment respectively to 31.46 and 115.10 mg/L with only 100 s of 900 W microwave irradiation.