环保罩吸清淤脱水工艺对河道水质影响的研究

Research on Impact of Environmental Enclosure Suction Dredging and Dewatering Techniques on River Water Quality

针对城市河湖“底部衬砌、硬质护坡、渠化河道、多闸坝调控、多水草、多垃圾”等特点,采用筛分、浓缩箱、压滤、尾水沉淀等环保罩吸清淤工艺对护城河河底淤泥进行清淤,对淤泥进行脱水干化。结果表明,河水清淤作业过程对河水水质的COD、NH+4-N和DO影响时间短,范围小,产生的尾水经处理后,水质满足《水污染物综合排放标准》(DB 11/307—2013)标准,该工艺可为城市河湖环保清淤提供参考和借鉴。

In response to the characteristics of urban rivers and lakes such as“bottom lining,hard slope protection,channelized waterways,multi-gate regulation,abundant aquatic plants,and excessive garbage”,this paper employs environmentally enclosure suction dredging techniques such as screening,concentration boxes,pressure filtration,and tailwater sedimentation to remove sediment from the riverbed of the urban river.Additionally,the dredged sediment is dewatered and dried.The results indicate that the water quality parameters such as COD,NH+4-N,and DO are minimally affected during the process of dredging operations,and the treated tailwater meets the standards specified in the Comprehensive Discharge Standards for Water Pollutants(DB11/307—2013).This process can serve as a reference and provide guidance for environmentally-friendly dredging in urban rivers and lakes.