Treatment technology for small runoff and heavily-polluted river branches

Abstract

The invention discloses a treatment technology for small runoff and heavily-polluted river branches. The technology is characterized by the processes of: blocking a river to set a drop dam, in front of which a dirt accommodating pit is digged, and the dirt accommodating pit is in connection with the drop dam; determining a certain distance in front of the dirt accommodating pit for hanging and immersing a slow release medicine package on the basis of a large flocculating unit forming before currents arriving the drop dam, and installing a spoiler between the slow release medicine package hanging and immersing point and the dirt accommodating pit for perturbing the currents so as to improve the flocculation efficiency, so that pollutant colloids, dissolved phosphorus or solid pollutants in the water body can be flocculated before reaching the drop dam and the generated flocculating unit, when blocked by the drop dam, sinks to the dirt accommodating pit so as to be removed at a fixed point, leaving the upper clear water that undergoes flocculation to overflow the drop dam and move ahead. And the forward moving currents also provide a water body oxygen enriching function. The technology of the invention can obviously improve the water quality and greatly reduce the river branch treatment cost.

Description

technical field [0001] The invention relates to a treatment process for small runoff and heavily polluted river surges. Background technique [0002] River management is an international environmental protection problem. Just take the Guangzhou river management project as an example: since 2008, it has spent 48.6 billion yuan, and the results are not good. Currently, it is planned to invest 87.2 billion in five years to treat it. There are basically two prerequisites for existing successful cases at home and abroad: 1. Large runoff or water diversion projects to wash away sludge; 2. Realization of sewage interception and treatment projects. On this basis, methods such as biological embankment, biological floating island, aeration, and microbial restoration can further improve the water quality. Because water diversion will bring pollution sources to the downstream, there are still disagreements on whether the method is scientific, and the cost of water diversion is quite hi...

AI Technical Summary

Problems solved by technology

Due to the weak scouring force of the water body, the accumulation of river silt is usually serious; due to the low biomass and low dissolved oxygen, the self-purification ability of the water body is poor; due to the large amount of construction and the small space, it is difficult to effectively lay conventional sewage interception pipe networks; Huge and difficult to plan

Small runoffs and heavily polluted rivers and gushes currently lack successful treatment cases in China, and often can only be transformed into underdrains, but correspondingly there is a problem of clogged underdrains that are difficult to clean

This type of stream can not be treated only by conventional biological methods. A typical case is Chigang Chung in Guangzhou, which is a typical small runoff and heavily polluted stream. Although biological embankments and wetlands have been used in recent river management, biofilm , sediment treatment and other methods, and the organisms of these methods are in good condition, but at present, the river is still black, smelly and inferior to category 5 water quality, which proves that conventional biological technology can only slightly reduce pollution

Although it is theoretically possible to lay a large number of aeration pumps to increase the biomass, it will bring about huge costs and difficult management problems.