图片名称
Shenhua Tarangole Coal Mine Mine Water Treatment Project

Shenhua Tarangole Coal Mine Mine Water Treatment Project

Project Description   The Tarangaole Coal Mine Mine Water Treatment Project of Shenhua Hangjin Energy Co., Ltd. is located in Ordos City, Inner Mongolia Autonomous Region, and its administrative divisions belong to Hangjin Banner and Dalat Banner. The project is EPC general contracted construction by Lexus Environmental Protection Co., Ltd. and Jiangsu Lexus Environmental Protection Engineering Co., Ltd.

Case description

Project Description
 
The Tarangaole Coal Mine Mine Water Treatment Project of Shenhua Hangjin Energy Co., Ltd. is located in Ordos City, Inner Mongolia Autonomous Region, and its administrative divisions belong to Hangjin Banner and Dalat Banner. The project is EPC general contracted construction by Lexus Environmental Protection Co., Ltd. and Jiangsu Lexus Environmental Protection Engineering Co., Ltd.
 
Project Overview
 
The designed influent water treatment scale of this project is 9600 m³/d. The sewage treatment adopts the process of "pretreatment + advanced treatment + membrane treatment". The pretreatment unit includes a pre-sedimentation tank and a conditioning tank, and the advanced treatment unit includes a high-density sedimentation tank. And V-type filter tank, membrane treatment unit includes ultrafiltration system and reverse osmosis system; sludge treatment adopts "mud storage tank + centrifugal dehydrator" process, and mud cake is transported out for disposal. After treatment, the effluent is reused for the production of supplementary water in the coal washing plant, underground fire fighting, water sprinkling, ground greening and farmland irrigation, domestic water in the mining area and water for underground equipment or discharge up to the standard.
   After treatment, the effluent of 3300 m³/d/d meets the "Water Quality Standard for Coal Washing" (GB50359-2005), and is reused for the production of supplementary water in the coal washing plant; (GB50383-2006), reused for underground fire fighting and watering; the effluent of 2000 m³/d meets the "Water Quality for Urban Wastewater Recycling and Utilization of Urban Miscellaneous Water" (GB 18920-2002) and "Water Quality for Farmland Irrigation for Urban Wastewater Recycling and Utilization" (GB20922 -2007), it is used for ground greening and farmland irrigation; the effluent of 2000m³/d meets the water quality requirements of "Drinking Water Sanitation Standard" (GB5749-2006), and is reused for domestic water in mining areas and underground equipment Water; the remaining effluent shall be discharged in compliance with the "Coal Industry Pollutant Discharge Standard" (GB20426-2006).
 
Design Brief
 
1. Project Overview
 
The designed influent water treatment scale of this project is 9600 m³/d.
 
Since the treated mine water has five different uses, the effluent needs to meet five different water quality indicators:
 
1) The effluent of 3300m³/d meets the "Water Selection Standard for Coal Washing" (GB50359-2005), and is reused for the production of supplementary water in the coal washing plant.
2) The effluent of 1892m³/d meets the "Water Quality Standard for Underground Fire Sprinkling in Coal Mine" (GB50383-2006), and is reused for underground fire fighting and sprinkling.
3) The effluent of 2000m³/d reaches the higher limit in "Water Quality for Urban Wastewater Recycling and Utilization of Urban Miscellaneous Water" (GB 18920-2002) and "Water Quality for Farmland Irrigation for Urban Wastewater Recycling and Utilization" (GB20922-2007). Greening and farmland irrigation use.
4) The effluent of 2000m³/d meets the water quality requirements of the "Drinking Water Sanitation Standard" (GB5749-2006), and is reused for domestic water in the mining area and water for underground equipment.
5) The remaining effluent shall be discharged in compliance with the "Coal Industry Pollutant Discharge Standard" (GB20426-2006).
 
2. Process route
 
Combined with the actual operation data and design experience of similar wastewater designed by our company, on the basis of ensuring the operation effect, and in line with the basic principles of "low investment, low operating cost and high treatment efficiency", the following process is determined: 
   
( 1) Pretreatment process: pre-sedimentation tank + conditioning tank. Through physicochemical treatment, SS, COD and other pollutants in sewage are removed.
 
Pre-sedimentation tank: There are many large-sized impurities and suspended solids in the mine water. The influent water is pre-precipitated to remove large-sized impurities and some suspended solids to ensure the safe operation of subsequent processes and equipment.
 
Adjustment tank: Since the output of mine water is greatly affected by production activities, changes in water volume will cause fluctuations in the system. Therefore, the adjustment tank plays a role in adjusting the water volume and at the same time enhances the shock load resistance of the entire system.
 
(2) Advanced treatment process: high-density clarifier and clean water tank in coal preparation plant + V-type filter tank and intermediate tank.
 
High-density clarifier: remove insoluble particles, suspended solids and heavy metal ions in sewage, and provide stable and good water quality conditions for subsequent treatment. The high-density clarifier can remove the organic and inorganic pollutants in the colloidal and micro-suspended state in the sewage. Through agglomeration, it becomes a floc with larger particles and is easy to precipitate, and then removed by precipitation to reduce the color and turbidity of the sewage. to make the system run stably. The high-density clarifier is a new-generation sedimentation process that integrates various theories such as coagulation, sludge circulation, inclined tube separation and sludge concentration, and is developed through reasonable hydraulic and structural design. .
 
Coal preparation plant produces clear water pool: The effluent of high-density clarifier flows to coal preparation plant to produce clear water pool, and the effluent from coal preparation plant clear water pool is used for coal preparation water.
 
V-type filter: to further remove SS in the sewage to ensure that the effluent is discharged or reused up to the standard.
 
Intermediate pool: The effluent from the V-type filter is disinfected here, and is used as a reservoir for up-to-standard discharge, water for underground fire fighting, and water for greening irrigation.
 
(3) Membrane treatment process: plate heat exchanger + multi-media filter + intermediate water tank + self-cleaning filter + ultrafiltration + reverse osmosis + domestic water tank process. The domestic water in the mining area and the water used for underground equipment have high water quality requirements. Through membrane separation technology, it can not only ensure the discharge up to the standard, but also has many advantages such as convenient operation and management, and small footprint.
 
Plate heat exchanger: Heat the incoming water to ensure that the subsequent membrane treatment system operates at a suitable temperature and maintain the normal and stable operation of the system.
 
Multi-media filter: After primary filtration, part of SS in mine water is removed.
 
Intermediate water tank: Considering that the pressure inside the multi-media filter should not be too large, in order to protect the filter layer from being broken, an intermediate water tank is set after the water is discharged, and the water from the intermediate water tank is lifted by the lift pump and then enters the self-cleaning filter.
 
Self-cleaning filter: The content of SS in mine water is relatively high. It can be filtered through a multi-media filter in the first stage and then through the self-cleaning filter in the second stage to ensure the safe operation of the membrane treatment system and prolong the use of the membrane system. life.
 
Ultrafiltration + reverse osmosis: remove soluble metal salts, organic pollutants, bacteria, colloidal particles, and heating substances. After membrane separation, the desalination rate is greater than 99%, and the removal rate of COD can reach more than 95%. The effluent quality Stablize.
 
Domestic water pool: The reverse osmosis effluent is weakly acidic, and after adjustment of PH and disinfection, it enters the domestic water pool and is reused up to the standard.
 
(4) Sludge treatment process: sludge storage tank + sludge dewatering process. The sludge in the pre-sedimentation tank and the high-density sedimentation tank is discharged into the sludge storage tank, and after being dehydrated by the centrifugal dehydrator, the sludge is transported out for disposal.
 
(5) Concentrated water treatment: Concentrated water pool. The concentrated water from ultrafiltration and reverse osmosis is discharged into the concentrated water tank, and after being lifted, it is mixed with the high-density clarifier and the effluent from the clean water tank produced by the coal preparation plant as coal preparation water.
 
(6) Thermal insulation and heating design. The adjustment pool, intermediate pool, living and equipment pools, concentrated pools, etc. are all underground structures, so as to maintain the water temperature under low temperature conditions. The rest of the process facilities and equipment are placed in the comprehensive workshop and membrane treatment workshop, and ventilation and heating are designed in the workshop. equipment to ensure the normal operation of the entire system.
 
The flow chart of mine water treatment process in this project is as follows:

Reverse osmosis process equipment
 

 
Live photos
 

 
现场照片
 

 Inclined tube sedimentation tank