关键词: 微波辐射, 污泥, 氮, 磷, 释放

Abstract: 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 supernatant 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 supernatant 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 supernatant 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.

Key words: microwave irradiation, sludge, nitrogen, phosphorus, release