Sewage purifying method for coal conveying system

Abstract

The invention discloses a sewage purifying method for a coal conveying system. The method comprises the following steps: step 1, introducing conveyed coal washing water; step 2, treating sewage in a secondary sedimentation tank; step 3, treating sewage large-particle suspended solids; step 4, treating sewage small-particle suspended solids; step 5, absorbing and intercepting sewage filtered in a filtering area through a filtering layer, so that water flows into a clear water tank after being purified and rising to a clear water area, and sludge in a sludge concentration area is intermittently discharged into a primary sedimentation tank for sedimentation through a sludge discharging valve at the bottom of a water purifier. The sewage purifying method disclosed by the invention has the benefits that that a wastewater recycling system is brief in process, reliable in performance, relatively low in investment cost, relatively high in price performance ratio, small in area occupied by system equipment, relatively low in running cost, and obvious in environmental benefits and economic benefits.

Description

technical field [0001] The invention relates to a sewage purification method used in a coal conveying system, and belongs to the technical field of water purification methods. Background technique [0002] Circulating water is a closed-circuit circulating water system composed of the water supply and drainage systems of a factory, workshop or section. The waste water generated in the system is reused after proper treatment, and fresh water is not replenished or added in a small amount, and no discharge or a small amount of fresh water is added. The way of using water to discharge waste water; my country’s water resources are very poor, most of the country is short of resource water, and some areas are water short of water quality; the power industry is a pillar industry of the national economy, and it is also a large water user. Discharge of flushing water, gray water and other waste water is about 6 million m3 3 , the main pollution factors in wastewater are CODer, SS and oi...

AI Technical Summary

Problems solved by technology

[0002] Circulating water is a closed-circuit circulating water system composed of the water supply and drainage systems of a factory, workshop or section. The waste water generated in the system is reused after proper treatment, and fresh water is not replenished or added in a small amount, and no discharge or a small amount of fresh water is added. The way of using water to discharge waste water; my country’s water resources are very poor, most of the country is short of resource water, and some areas are water short of water quality; the power industry is a pillar industry of the national economy, and it is also a large water user. Discharge of flushing water, gray water and other waste water is about 6 million m3 3 , the main pollution factors in wastewater are CODer, SS and oil, etc., which not only bring certain pollution to my country's water environment, but more importantly, waste of water resources; therefore, it is necessary to carry out water recovery and recycling; it realizes recycling An important part of water use is water purification; water purification refers to the purification process of removing pollutants from raw water, the purpose of which is to achieve the effect of water purification through specific procedures and use water for different purposes; It is for human consumption; purified water can also be used for many other purposes such as medicine, pharmacology, chemistry and industry; purification methods include: ultraviolet light, filtration, hard water softening, reverse osmosis, ultrafiltration, molecular extraction, detoxification Ion and carbon treatment; however, the existing water purification process of the coal transportation system is relatively complicated, and the purification effect is not ideal