Urban open trench black and odorous water body treatment method

Abstract

The invention discloses an urban open trench black and odorous water body treatment method. The method combines sewage interception, a preposed pond, a grassed trench and dredging, and a rainwater regulating and storing pond is not built; on the basis of balance calculation of total incoming water amount and total pollutant of an open trench and water reducing amount and pollutant reducing amount of each measure, quality reachability of water flowing into a river is analyzed, and engineering amount is checked on the basis of water quality reachability; rainwater catchment area is divided on the basis of terrain on a topographic map and water flow direction of a current rainwater pipeline network, and catchment area of sewage is divided on the basis of a current sewage pipeline network and on-site detection. The preposed pond plays a role in regulating and storing rainwater and removing SS and a little of organic pollutant in the rainwater, and the grassed trench serving as an ecological diversion belt can intercept rainwater pollutant and can lower runoff peak value through infiltration and prolonging rainwater retention time when being used for rainfall flood transmission. Quality of rainwater flowing into the river from the open trench reaches standards higher than over-ground class-5 water in wet reasons.

Description

technical field [0001] The invention relates to the field of black and odorous water treatment, in particular to a method for treating black and odorous water in urban open ditches. Background technique [0002] As of February 16, 2016, more than 70% of the 295 prefecture-level and above cities across the country have detected black and odorous water bodies, and the total number of identified black and odorous water bodies is 1,861. The "Guidelines for the Remediation of Urban Black and Odor Waters" requires that the built-up areas of cities at and above the prefecture level across the country should have no large-scale floating objects on the river surface, no garbage on the river banks, and no illegal sewage outlets by the end of 2017; the treatment of black and odorous water bodies should be completed by the end of 2020 Target. The built-up areas of municipalities directly under the Central Government, provincial capital cities, and cities under separate state planning s...

AI Technical Summary

Problems solved by technology

However, due to the large dispersion and different degrees of pollution, it is impossible to build primary rain storage tanks for diversion rainwater ditches or culverts with a relatively small rainwater catchment area (200-500 hectares). If the storage pool is used, the investment cost is high and the demand for land is large

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