A system and a method for recycling coal mine drainage and power plant waste water with zero discharge

Abstract

The present invention discloses a system and a method for recycling coal mine drainage and power plant waste water with zero discharge. The system comprises a coal mine drainage low-speed decarbonization treatment system, a sludge utilizing system, a boiler blowdown water recycling system, a clean water utilizing system and a concentrated drainage utilizing system. The coal mine drainage low-speed decarbonization treatment system mainly comprises a low-speed decarbonization treatment device; the boiler blowdown water recycling system mainly comprises a disc filter, an ultrafiltration water purifier, a security filter and a reverse osmosis water purifier; and the clean water utilizing system comprises a clean water reservoir, a first stage cooling tower and a second stage cooling tower. The method comprises steps of: 1, coal mine drainage low-speed decarbonization treatment; 2, sludge utilizing; 3, boiler blowdown water treatment and recycling; 4, clean water untlizing; and 5, concentrated drainage utilizing. According to the invention, the system and the method are novel and reasonable in design with zero discharge of both solid waste and waste water, energy-saving, environmental friendly, very practical, and high in promotion value; and recycling of waste water and full utilization of sludge can be achieved.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a zero-discharge system and method for draining underground water and circulating treatment and utilization of power plant wastewater. Background technique [0002] In the zero-discharge system for the underground drainage water and power plant wastewater recycling treatment, the softening, filtration and sludge treatment of the drainage water discharged from the coal mine underground are the core of the system. Sewage treatment projects in the United States, Germany, Japan and other countries generally refer to the treatment of domestic sewage, construction sewage and industrial wastewater. Generally speaking, sewage treatment is divided into three steps: primary treatment (that is, physical treatment), the effluent of the primary sedimentation tank enters the biological treatment equipment, there are activated sludge method and biofilm method, (the reactor of the activa...

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Problems solved by technology

The advantage of this method is that the price is cheap and the supply of goods is sufficient; however, due to the small density of coal particles, the sedimentation speed of the formed alum flowers is relatively slow, and the coagulation and clarification effect is not good; Yanzhou Mining (Group) Co., Ltd. resources, transform and use the desalinated and purified coal mine drainage water as boiler feed water, but there is still no explanation for the discharge of waste water

Ye Zhi'an and Yuan Guoquan from Xi'an Institute of Thermal Engineering conducted some research on the process of slow decarburization water treatment; Xu Zhen and Yang Baohong conducted experimental research on slow decarburization lime treatment; Wang Jing and Mao Jin did water moral clarification and Purification treatment has been done to a certain extent, but there is no practical application of zero discharge in the circulation treatment of drained water discharged from coal mines.

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