In this project, the composite coagulant developed in advance was adjusted, based on the specific resistance to filtration during sludge dewatering and final water content of sludge cake. And the mixture ratio of the composite coagulant and its optimal dosage could be determined, which was applied for dewatering of sludge in mass production. The dewatered sludge was used for growth of landscape plants. Employing various ratios of sludge to soil, Loliumperenne L., Festuca arundinacea, Tagetes Patula L. and S...