Method for blocking water through artificial bend at river canal estuary sewage treatment facility grit basin

Abstract

The invention provides a method for blocking water through an artificial bend at a river canal estuary sewage treatment facility grit basin, belongs to the technical field of sewage treatment and an urban-rural fringe zone estuary river channel sediment treatment method and relates to a grit basin replacement process. The method is characterized in that a rolling stone dam is built in the place where water flow becomes from narrow to wide in the water flowing direction; the rolling stone dam is arranged in the widest place of the water flow at the river canal estuary; the ratio of the flow-passing surface of the widest place to the narrowest place of the river canal estuary is greater than or equal to 2; the water flow forms the bend at the rolling stone dam; the width of water flowing into the bend and the width of the water flowing out of the bend are equal; the width of the flow-passing surface is calculated according to the measured peak water flow of a river channel; and it is ensured that the distance from the water surface where the peak flow passes to the upper edge of the rolling stone dam is 10 cm or more. According to the method, water and sand go separate ways, clean water is led into the estuary and simultaneously sediment is cleared away mainly through rational utilization of the favorable terrain and the proper engineering layout.

Description

technical field [0001] The invention belongs to a method for treating mud and sand in an estuary channel in an urban-rural junction, belongs to the technical field of sewage treatment, and relates to a grit chamber replacement process, mainly through rational use of favorable terrain, proper engineering layout, so that water and sand can go their own way, and clean water can be separated. Introduce the water inlet and remove the mud and sand at the same time. Background technique [0002] Sewage will inevitably be mixed with mud and sand in the process of migration, flow and collection. Inorganic particles in sewage will not only wear out equipment and pipelines, reduce the activity of activated sludge, but also accumulate at the bottom of the reaction tank to reduce the effective volume of the reactor and affect the operation of subsequent treatment equipment. Therefore, the grit chamber is a very important structure in the sewage pretreatment stage. [0003] The grit cha...

AI Technical Summary

Problems solved by technology

However, the biochemical treatment system is located in the exposed system at the end of the river and the estuary, which is greatly affected by external factors.

Due to the incomplete water and soil conservation facilities on both sides of the middle and upper reaches of the river, and the large water level drop in the Dingsi Bridge section, the accumulation of mud and sand during the rainy season in July and August will cause mud and sand deposition and fill blockage, which will have an impact on the subsequent biological pools and make sewage treatment The effect becomes worse

[0009] The surface erosion sewage of the Second Drainage has a lot of displacement, and is restricted by land occupation. It is difficult to build a secondary biological treatment facility by using the original flood discharge ditches.

In foreign countries, the treatment of river water is generally terminal treatment, and the design of grit chambers at the bottom of the pond and the design of mud and sand treatment in the middle of the river area are rarely reported at home and abroad, and there is no reference for the treatment of the second row of Wenyu River.

Images