General contracting of the construction project of the mine sewage treatment station in Shanyang Coal Mine
Example of domestic sewage treatment project
1. Introduction
Domestic sewage in mining areas mainly comes from organic wastewater from staff apartments, office buildings and restaurants, and the wastewater must be treated before discharge. The main difficulty in this project lies in the great difference of water quantity and quality in different periods of domestic sewage inflow in mining area. The treated water quality of this project meets the national and local pollutant discharge standards, which can ensure the long-term stable operation of the system. The domestic sewage treatment station is not associated with other buildings, but arranged independently, and unified fences are set on both sides of the permanent-temporary road, which shows the advanced planning of the design. In addition, the drainage measures inside and outside the site are well considered to ensure the drainage in rainy season.
2. Treatment solution
The domestic sewage in mining area is treated by A2O process. After being treated, the sewage enters the greening reuse water system in mining area, and the treated sludge is concentrated and transported outside after being dehydrated by filter pressing. Considering the problem of uneven inflow and water quality, flow devices are set on different sewage pipes to monitor the sewage flow in real time and adjust the subsequent treatment parameters in time. At the same time, a water collecting area and a regulating area are set at the front end of the sewage entering the treatment unit to fully regulate the water quantity and quality. Through the analysis of system operation data records, the optimization model of dosing concentration and dosage of the project is established, which is convenient for long-term operation, maintenance and management of the system.
3. Construction situation
The total construction period of the project is 180 calendar days, and the sewage treatment volume is 720m3/d-1200m3/d. The construction has completed 9 process ponds, 6 treatment workshops and 36 sets of equipment installation, with a total building area of 2350m2. This project includes engineering design, equipment and materials procurement, construction and system operation after completion, technical service and personnel training.
Figure 1 Mechanical grid Figure 2 Underground pump house
Figure 3 Dosing system
Figure 4 Sedimentation tank and A2O reaction tank
Figure 5 Disinfection system
Figure 6 Pressure filtration system
4. Achieved accomplishment
The quality of sewage before and after treatment in this project is shown in the following table. After treatment, the relevant indicators of water quality meet the relevant national drainage standards, and the sewage treatment facilities have passed the environmental protection acceptance of the relevant units, which eliminates worries for the domestic sewage discharged in the future production and operation of the mining area. The set-up pipeline flow monitoring device and the establishment of the optimization model of dosing concentration and dosage provide sufficient theoretical basis and technical support for the system operation, effectively reducing the cost in the system operation process and the later operation cost of the construction unit. After the implementation of the project, it has obvious economic and social environmental benefits. The optimization model established on the basis of relevant data during the operation period of the project has certain application value.
Table 1 Domestic sewage quality before and after treatment
Serial number | Item | Intake water quality | Effluent quality |
1 | CODcr | ≤400mg/L | ≤50mg/L |
2 | BOD5 | ≤180mg/L | ≤10mg/L |
3 | Suspended matter (SS) | ≤200mg/L | ≤10mg/L |
4 | Ammonia nitrogen (NH3-N) | ≤40mg/L | ≤8mg/L |
5 | pH | 6-9 | 6-9 |
6 | Petroleum category | ≤20mg/L | ≤1mg/L |
7 | Total p | ≤5mg/L | ≤0.5mg/L |
8 | Total coliform group | 10000 PCs /L | ≤3 PCs /L |
Figure 7 Renderings of the station area
Figure 8 Central control room
5. FAQ
Q1. What problems exist in the operation of A2O process adopted in this project? How is it solved?
A: The main problem is that the influence of the amount of returned sludge has great fluctuation on the treatment effect. Through theoretical calculation and many tests in actual operation, the parameters with good treatment effect are selected for adjustment.
Q2. There will be odor in the operation of domestic sewage treatment station. How to deal with it?
A: The domestic sewage treatment station of this project has a reasonable site selection and good ventilation. The corresponding ventilation system is provided in the station, and the plant area is afforested to minimize the influence of odor in the station.
Q3. What is the actual effect of the flow monitoring device set on the pipeline?
A: Monitor the sewage pipeline flow, adjust the treatment parameters timely and reasonably according to the different water quality in different periods, guide the operation and reduce the operation cost.
Q4. Is there any practical significance in establishing the optimization model of dosing concentration and dosage?
A: It has practical significance. Through the data collation and analysis of the actual operation process, the theoretical parameters are supplemented and revised to some extent. The established optimization model has passed the verification and is suitable for the dosing system of this project. It can be used for reference in other similar projects or establish a model suitable for its project.
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