Exploring the application of river ecological dredging and sludge treatment and disposal technology
Aims:This paper aims to study the ecological dredging scheme and sludge dewatering treatment and disposal methods for urban rivers.Methods:Based on the environmental characteristics and construction difficulties of river channels,as well as the characteristics of the silt,a comprehensive analysis was conducted on different ecological dredging techniques and methods for the utilization of silt resources.Results:Ecological and landscape rivers were desilted by intelligent sweeping and suction dredging technology.Comprehensive and industrial rivers were desilted by cutter suction dredging process.It was found that the flocculation chemicals formulated with 2‰ cationic polyacrylamide,3% polymeric aluminum chloride and 1.5‰ anionic polyacrylamide had a better flocculation effect.The plate and frame filter press dewatering method could the high-pressure belt filter press dewatering method could reduce the moisture content of the dewatered sludge to 30% ～50% .The dewatered sludge could be used as nutrient soil,substrate material for planting,mulch,backfill soil as well as the material for sintered bricks and ceramsite.Conclusions:The ecological dredging scheme can effectively deal with the siltation problem of different urban rivers and further provide a feasible scheme for the resource utilization of silt.
国家科技期刊平台
NSTL
万方数据
