Coal mine wastewater treatment system
By combining magnetic separation and air flotation devices with PAC and PAM dosing devices, the problem of large footprint and high cost in coal mine wastewater treatment systems has been solved, achieving efficient and low-cost wastewater treatment. This method is suitable for projects with limited land use in both underground and above-ground mining areas.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-26
- Publication Date
- 2026-03-27
AI Technical Summary
Existing coal mine wastewater treatment systems are large in area, expensive, and have poor treatment effects. In particular, traditional mine water treatment systems require backwashing systems, which increases the scale of construction and costs.
A combined process of magnetic separation and air flotation is adopted to first remove large particulate matter, then small particulate matter, eliminating the need for backwashing and optimizing the treatment process using PAC and PAM dosing devices.
It achieves efficient treatment of coal mine wastewater with a small footprint and low cost, reducing the suspended solids content to below 10mg/L after treatment. It is suitable for wastewater treatment projects in underground and above-ground mining areas with limited land.
Smart Images
Figure CN224047178U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to the technical field of wastewater treatment, and particularly relates to a coal mine wastewater treatment system. BACKGROUND
[0002] In coal mining operations, all the water that seeps into the underground mining space, or a small amount of surface water that seeps in, is mine water. The national requirement for mine water treatment is recycling and prohibiting discharge, and mine water is used as a kind of unconventional water resource for production in the mining area and surrounding enterprises. Mine water mainly contains suspended solids mainly composed of coal dust and rock powder, and can be used as underground production water or daily domestic water after treatment. At present, mine water treatment mostly adopts the traditional "coagulation sedimentation + filtration" process system. In the traditional mine water treatment system, a filter tank or a multi-medium filtration device is added after the magnetic separation process, but these devices all need to be configured with a backwashing system, and the backwashing water also needs to be returned to the system, which increases the construction scale and cost of the system. The entire system equipment has the disadvantages of large land occupation, long hydraulic retention time, insufficient treatment effect and capacity, and certain constraints in mine water treatment. SUMMARY
[0003] To solve the problems in the prior art, the utility model provides a mine water treatment system, which can treat coal mine wastewater with less land occupation and lower cost, and recycle the treated wastewater.
[0004] The technical scheme of the utility model is as follows:
[0005] A coal mine wastewater treatment system comprises a regulating tank, a regulating tank lifting pump, a magnetic separation device, an intermediate water tank, an intermediate water tank lifting pump, a flotation tank, a clean water tank, and PAC, PAM dosing devices, a sludge tank, a sludge pump and a plate-and-frame filter press connected in sequence.
[0006] The outlet of the regulating tank is connected with the regulating tank lifting pump, the inlet of the regulating tank lifting pump is connected with the inlet of the magnetic separation device, the outlet of the magnetic separation device is connected with the inlet of the intermediate water tank, the sludge outlet of the magnetic separation device is connected with the inlet of the sludge tank, the outlet of the intermediate water tank is connected with the inlet of the intermediate water tank lifting pump, the outlet of the intermediate water tank lifting pump is connected with the inlet of the flotation tank, the outlet of the flotation tank is connected with the inlet of the clean water tank, the sludge outlet of the flotation tank is connected with the inlet of the sludge tank, the outlet of the sludge tank is connected with the inlet of the sludge pump, and the outlet of the sludge pump is connected with the inlet of the plate-and-frame filter press.
[0007] Preferably, the magnetic separation device is a general sewage treatment magnetic separation device on the market, which is connected with the PAC and PAM dosing devices.
[0008] Preferably, the flotation tank is provided with a flotation device.
[0009] Preferably, a sludge mixer is installed in the sludge tank.
[0010] Preferably, the PAC and PAM dosing devices are connected to the inlet of the coagulation reaction tank of the magnetic separation device and the dosing port of the air flotation device via dosing pipelines.
[0011] This utility model has the following beneficial effects:
[0012] This invention first uses a magnetic separation device to remove large suspended solids from mine water, and then uses an air flotation device to remove the remaining small particles and difficult-to-settle suspended particles. The suspended solids content of the magnetically separated water is generally around 50 mg / L. Then it enters the air flotation device, and after passing through the ion air flotation device, the suspended solids content can be reduced to below 10 mg / L. Compared with traditional mine water treatment systems, this invention adopts a magnetic separation plus air flotation process, which does not require backwashing. The whole process is simple, low-cost, and has the characteristics of small footprint and stable treatment effect. It can be used for sewage treatment projects in underground or above-ground mining areas where land is scarce. Attached Figure Description
[0013] Figure 1 This is a process flow diagram of the mine wastewater treatment system of this utility model. Detailed Implementation
[0014] The following will be combined with the appendix Figure 1 The technical solution of this utility model is clearly and completely described. A coal mine wastewater treatment system includes an equalization tank, an equalization tank lift pump, a magnetic separation device, an intermediate water tank, an intermediate water tank lift pump, an air flotation tank, and a clear water tank connected in sequence. It also includes a PAC and PAM dosing device, a sludge tank, a sludge pump, and a plate and frame filter press.
[0015] The outlet of the equalization tank is connected to the equalization tank lift pump, the inlet of the equalization tank lift pump is connected to the inlet of the magnetic separation device, the outlet of the magnetic separation device is connected to the inlet of the intermediate water tank, the sludge outlet of the magnetic separation device is connected to the inlet of the sludge tank, the outlet of the intermediate water tank is connected to the inlet of the intermediate water tank lift pump, the outlet of the intermediate water tank lift pump is connected to the inlet of the dissolved air flotation tank, the outlet of the dissolved air flotation tank is connected to the inlet of the clear water tank, the sludge outlet of the dissolved air flotation tank is connected to the inlet of the sludge tank, the outlet of the sludge tank is connected to the inlet of the sludge pump, and the outlet of the sludge pump is connected to the inlet of the plate and frame filter press.
[0016] The regulating tank is made of steel or reinforced concrete and is used to regulate water quality and quantity.
[0017] The magnetic separation device is a commercially available magnetic separation device for wastewater treatment. In this case, the magnetic separation device produced by China Construction Environmental Energy Technology Co., Ltd. is preferred. It is equipped with a coagulation reaction tank connected to PAC and PAM dosing devices.
[0018] The air floatation tank is provided with an air floatation device, and the air floatation tank is a tank for separating solid and liquid by using a large amount of micro-bubbles to capture and adsorb small particle adhesives to make them float.
[0019] The sludge tank is provided with a sludge agitator.
[0020] The PAC and PAM dosing device is connected with the water inlet of the coagulation reaction tank of the magnetic separation device and the dosing port of the air floatation device through a dosing pipeline.
[0021] The utility model discloses a magnetic separation device is removed the suspended matter of big particle in mine water first, then through air floatation device removes the small particle of remaining, difficult settlement suspended particle, and the suspended matter content of magnetic separation water is about 50mg / L generally, then enters air floatation device, after ion air floatation device, the suspended matter content can reduce to 10mg / L below.
[0022] The above is only the preferred embodiment of the utility model, and it should be pointed out that for ordinary skilled person in the art, on the premise of not departing from the principle of the utility model, a number of improvements can be made, and these improvements should also be regarded as the protection scope of the utility model without paying the creative labor.
Claims
1. A coal mine wastewater treatment system, characterised in that: It comprises a regulating pool, a regulating pool lifting pump, a magnetic separation device, an intermediate water pool, an intermediate water pool lifting pump, a air floatation pool and a clear water pool connected in sequence, and further comprises a PAC, PAM dosing device, a sludge pool, a sludge pump and a plate-frame filter press. The outlet of the regulating pool is connected with the regulating pool lifting pump, the inlet of the regulating pool lifting pump is connected with the inlet of the magnetic separation device, the outlet of the magnetic separation device is connected with the inlet of the intermediate water pool, the sludge outlet of the magnetic separation device is connected with the inlet of the sludge pool, the outlet of the intermediate water pool is connected with the inlet of the intermediate water pool lifting pump, the outlet of the intermediate water pool lifting pump is connected with the inlet of the air floatation pool, the outlet of the air floatation pool is connected with the inlet of the clear water pool, the sludge outlet of the air floatation pool is connected with the inlet of the sludge pool, the outlet of the sludge pool is connected with the inlet of the sludge pump, and the outlet of the sludge pump is connected with the inlet of the plate-frame filter press.
2. The coal mine wastewater treatment system of claim 1, wherein: The magnetic separation device is provided with a coagulation reaction box connected with the PAC, PAM dosing device.
3. The coal mine wastewater treatment system of claim 1, wherein: The air floatation pool is provided with an air floatation device.
4. The coal mine wastewater treatment system of claim 1, wherein: The sludge pool is provided with a sludge agitator.
5. The coal mine wastewater treatment system of claim 1, wherein: The PAC, PAM dosing device is connected with the water inlet of the coagulation reaction pool of the magnetic separation device and the dosing port of the air floatation device through a dosing pipeline.