Coal mine sewage treatment and recovery technology

Abstract

The invention discloses a coal mine sewage treatment and recovery technology. The technology comprises the following steps: 1, sewage enters a settling tank, and settles for 1-2 h, and 70-90 g of a flocculating agent is added to per cubic meter of wastewater in the settling process; 2, surface clear water is extracted into a biodegradation tank, and undergoes aeration treatment for 40-50 min; 3, obtained water is sequentially filtered through activated carbon and quartz sands, wherein the flow rate is controlled in the filtration process; 4, the filtered water settles secondarily for 50-60 min; 5, the obtained water is secondarily filtered, and the water flow is stirred in the filtering process; 6, the obtained water is sterilized at a high temperature of 120-150 DEG C for 20-30 min; and 7, the sterilized water is cooled, and then is discharged. The technology makes effluent water reach the reuse standards of reclaimed water.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a coal mine sewage treatment and recycling process. Background technique [0002] Coal accounts for more than 70% of my country's energy structure. Mining coal pollutes the groundwater with good water quality. A large amount of coal powder, rock dust, suspended solids, artificial pollution and microorganisms enter the water. Oxygen, sulfide and total hardness are higher. Therefore, if a large amount of sewage exceeding the standard is discharged directly without treatment, it will cause serious pollution to the environment and cause a lot of waste of water resources. Coal mine sewage is a kind of precious resource. How to deal with and reuse has done a lot of work over the years and achieved certain results. However, the treatment method currently used in China is still a traditional process. Although this process is effective in treating reused water, the process is b...

AI Technical Summary

Problems solved by technology

However, the treatment method currently used in China is still a traditional process. Although this process is effective in treating reused water, the process is backward, the equipment and facilities are complicated, the project investment is large, the floor area is large, the operating cost is high, and the operation and management are inconvenient.