不同类型雨水箅子内垃圾量调查及对水质影响变化分析

Investigation and analysis of garbage accumulation in different types of rainwater grates and its impact on water quality

近年来,随着城市积水内涝频发,为解决雨水口堵塞造成的积水问题,雨箅子“平立结合”改造被广泛采纳。平立结合式雨水箅子增加过流能力同时,也增加了垃圾进入雨水口的可能性。为掌握不同类型雨水箅子垃圾收集情况,选择分布平箅子和平立结合箅子2种类型的道路作为调查对象,探讨雨水井内垃圾对排口水质及河道水质的影响。研究表明:平立结合雨水箅子下方雨水井内的垃圾量高于平箅子,垃圾厚度前者约是后者的1.4~1.7倍,填满度约是1.75~2.00倍,排口水质及河道水质与雨水井中垃圾状态密切相关,降解后的垃圾各项污染物数值明显偏高,对排口水质影响更突出,进而影响河道水质,且淤积现象更显著。本研究可为雨水箅子平立结合改造及后续日常管理提供依据。

In recent years,with the frequent occurrence of urban waterlogging,the"horizontal-vertical combination"of rain grate has been widely adopted to solve the problem of waterlogging caused by stormwater inlet blockage.While the horizontal-vertical combination rain grate increases the capacity of overflow,and also raises the likelihood of garbage entering the stormwater inlet.To understand the garbage collection situation in different types of rainwater grates and to further explore the influence of garbage in rainwater wells on the water quality of drains and rivers,two types of roads with flat grates,vertical and combined grates were selected as investigation objects.The research showed that the amount of garbage in rainwater well under the horizontal-vertical combination rain grate was higher than that of the flat grate,moreover,the thickness and the filling degree of the former was about 1.4-1.7 times and 1.75-2.00times higher than the latter.The water quality at discharge outlets and in rivers was closely related to the status of garbage in stormwater wells.Moreover,the value of various pollutants in degraded garbage was obviously higher,which had a more prominent impact on the water quality of drains and then affected the water quality of river channels,and induced the significant siltation phenomenon.It is suggested to optimize the existing horizontal-vertical combination rain grate structure,and to add a filter screen at the opposite grate in the subsequent horizontal-vertical combination renovation.This study can provide a basis for the horizontal-vertical combined renovation of rainwater grate and subsequent daily management.