Engineering Design on the Treatment and Reuse of Coal Mine Drainage
|Keywords||Coal mine drainage Project design Recycle Investment estimate|
Water shortages in colliery is already a general phenomenon in China, especially in the northern colliery.Lacking water not only has restricted the sustainable development of economy in the colliery, but also has influenced coal miner’s daily life. A great quantity of coal mine drainage is discharged with the coal mining. According to statistics, emissions of coal mine drainage is about 42 hundred million cubic meters one year,in China, in recent years, however, the recovery and utilization rate of it is less than thirty percent. Discharged of untreated mine drainage has polluted the environment and broken the ecological balance around the mining areas, meanwhile, has lead to a shocking waste of water. According to these problems, treatment and utilization of coal mine drainage, which on the one hand, can decrease environment damage and pollution, on the other hand, can bring us great economic returns is thought to be the best choice to solve the problem of water shortage in coal mine. Therefore, treatment and utilization of coal mine drainage achieve both environmental benefits social benefits and much huge economic efficiency.The design scale of this project is 1200m3/d. The influent parameter was determined depend upon the similar water quality index.A conventional sewage treatment process which is basically about physical method and chemical methods and a sludge treatment process, disposal project was selected at last by learning, analysing and comparing common mine water treatment process at home and abroad and combining with the wastewater quality and extraction requirements.A part of the effluent is reused for pouring under the shaft in coal mine and the rest part is drained. Reuse water carry out the Code for the colliery design of coal mining industry fire protection and watering dust prevention standards under the shaft of (GB50215—2005). discharge water meet the Emission standard for pollutants from coal industry emission standards of (GB 20426—2006)Comparison and selection of sewage and sludge treatment process equipment was discussed. An outline of them also was given in this paper. Process, structural, architectural, electrical, automatic control and general layout for sewage and sludge treatment structures and accessory building was designed. Main process diagram was drawn too. Project investment estimation and operation cost analysis were discussed in the paper.This treatment procedures has a lot of advantage such as:stable operation, advanced technology, automation degree high, simple operation, simple to administer, less in vestment, lower operation cost, As a consequence this technology have great value in both theory and utility, and can be used in treating the same kind of water.