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综述了城市污水现状及回用的必要性,分析了污水回用的效益及难点,从多个角度论述了污水回用途径及污水热能利用,最后展望了污水回用前景。“,”To summary the necessity of city sewage reuse, analyze its benefit and difficulties, discuss the ways and uti-lization of sewage heat energy,finally look forward to the prospect of sewage reuse.