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Environmental Energy Technology Case Study

来源:给水排水 作者: 阅读:1712 网友评论0 Updated: 2019-10-31 10:46 Source: Water Supply and Drainage Author: Read: 1712 2010 0 comments

Sewage treatment plants have a very important role in water environmental protection. In the rapid development of cities, in order to improve the environmental functions of surface water bodies, the requirements of effluent water quality of sewage treatment plants have been continuously improved. At the same time, the improvement of effluent water quality has become another way to develop water resources, which can save water resources and expand water use. range.

The current urban drainage system has the following problems:

Domestic sewage is not included in the pipe network and directly discharged into rainwater pipes or ditches, which ultimately affects the water environment quality of the basin

A series of pipe network problems such as low sewage concentration in the sewage plant caused by rainwater and sewage pipe network due to damage, misconnection, external leakage, etc., leading to full-pipe operation, and high water storage in dry days.

The overflow discharge caused by the overload operation of the sewage plant, the treated water quality is not up to standard, and the sewage plant itself becomes a source of pollution

In the actual operation of urban sewage plants, there are usually the following problems to be solved: water quality needs to reach Grade A or Quasi-four, limited site, limited construction time, low operating cost, and scalability of technology. Based on this transformation idea, it is necessary to transform the secondary biological unit on the original biological treatment system and add a deep processing unit. Such as MBR process, MBBR process, multi-stage AO / improved A2O, magnetic precipitation, super magnetic separation, efficient clarification, filter cloth filter, ozone oxidation, denitrification deep bed filter, etc. The difficulty of upgrading is to remove nitrogen and phosphorus, and it is recommended to consider the possibility of future expansion and upgrading of total nitrogen. It is best to use denitrifying biological filters and reserve them in design.

Aiming at the problem of upgrading and upgrading in the municipal sewage treatment field, Environmental Energy Technology has proposed the illustrated technical route, forming a product sequence with core technologies such as high-efficiency pretreatment technology, magnetic media coagulation sedimentation process and denitrification deep bed filter process And has accumulated some successful cases.

The RID rainwater interception and storage system is a product suitable for urban source control interception, pipe network improvement, sewage treatment quality improvement and efficiency improvement. By reasonably setting up interception and storage facilities in the drainage system, there can be control of non-point source pollution, prevention and control of waterlogging disasters, enhancement of drainage system stability, improvement of sewage treatment efficiency, and increase of rainwater utilization.

ReCoMag's ultra-magnetic separation water purification technology is based on non-magnetic water pollutants, and solid-liquid separation by disk adsorption and salvage to achieve rapid purification of water. Its highly efficient flocculation reaction, high separation efficiency, small footprint, The characteristics of effluent water quality, low operating cost, and high degree of automation make it an advantageous application technology in the field of source control and interception. In addition, the combination with non-blocking aerated biological filter technology also has the characteristics of unit modularization and on-site assembly, which is suitable for municipal overflow sewage and rapid bidding scenarios.

After the sewage enters the sewage treatment plant, the efficient pretreatment system takes the inflow non-metal orifice grille as the core, and the reasonable configuration of the coarse grille and the middle grille optimizes the entire pretreatment filtration process to achieve the directional particle size grid residue. Interception, completely solve the problem of clogging and scum in the subsequent processing unit.

After the sewage is processed by the front-end secondary biochemical system, the secondary biochemical effluent first enters the magnetic medium coagulation and sedimentation tank, and the coagulant PAC is added in the reaction zone. At the same time, it is used as a chemical phosphorus removal agent, and the flocculant PAM and magnetic powder are added to strengthen Flocculation, chemical dephosphorization and flocculation reaction, and then enter the clarification zone for precipitation separation, so that the effluent TP <0.2 mg / l, SS can generally reach about 8-10 mg / l. MagCS magnetic media coagulation sedimentation technology products refer to a new type of complete set of water treatment equipment based on traditional flocculation sedimentation, adding specific magnetic media, combined with magnetic recovery and other processes to achieve efficient water quality purification. Its effluent SS can reach below 8mg / L, and TP can reach below 0.1mg / L. It has very significant advantages in removing SS (suspended matter), TP (total phosphorus), etc. It has great application prospects in China's existing sewage treatment plant upgrades and new sewage treatment plant advanced treatment, and has deep denitrification bed Combined use of filters, the effluent can stably meet the requirements of the ground surface Category IV, and can meet the customer's various requirements from the first level B standard to the first level A standard, and then to the surface level IV standard.

case analysis

Case 1 Upgrade of Wenzhou West District Sewage Plant

The design capacity of Wenzhou Xibian Sewage Treatment Plant in the first phase of 2014 is 100,000 m3 / d, and the effluent index is Grade B. With the continuous increase in the volume of water accepted by the pipe network, the average daily treatment scale has reached 114,000 m3 / d, which is in an overloaded operating state, and the quality of the effluent water can not meet the requirements of the Grade A standard.

Based on the increase in water volume and water quality requirements, the sewage treatment plant in the western part of Wenzhou began to implement the two parts of the first-phase engineering upgrade and the second-phase project expansion. The design scale of the first phase of upgrading and upgrading is 100,000 m3 / d, and the design scale of the second phase expansion project is 150,000 m3 / d, and the total scale is 250,000 m3 / d. During the construction of the first and second phases, advanced treatment was added, and the MagCS magnetic media coagulation and sedimentation process of environmental energy technology was used to further remove SS and TP in the water body, and reached the level A discharge standard.

Case 2 Upgrading of a sewage treatment plant in Quanzhou

A sewage treatment plant in Quanzhou is located in the downtown area, with a designed scale of 150,000 tons / day. In order to respond to the national environmental protection policy and meet the needs of urban development planning, the sewage treatment plant started a capacity expansion and upgrading project, and the effluent water quality requirements reached surface level IV water standards. As the treatment plant faces the problem of tight land use, it is required to adopt a sewage treatment process with a small footprint and high treatment efficiency. After in-depth demonstration, the combination of MagCS magnetic media coagulation and sedimentation tank + denitrification deep bed filter was used as the main process to achieve the goal of raising water to the standard and saving land. In addition, the treated sewage can ecologically replenish urban rivers and can also be used as municipal reuse water such as green irrigation, saving water resources and improving the water environment of the river basin.

Case 3 Upgrading of a sewage treatment plant in Jiangmen, Guangdong

The first-phase design scale of a sewage treatment plant in Jiangmen City was 80,000 tons / d, and it was formally put into operation in September 2013. The first phase of the project designed the water quality to implement the "Water Pollutant Discharge Standard for Urban Sewage Treatment Plants" (GB18918-2002), the first level B standard for water pollutant discharge, and the "Water Pollution Emission Limit" (DB44 / 26-2001) of Guangdong Province for the second period Strict requirements in first-level standards.

In order to fully implement the requirements of the State Council's "Ten Articles of Water" and "Guangdong Province Water Pollution Prevention Action Plan Implementation Plan", the sewage treatment plant started upgrading and upgrading projects at the end of 2016, using MagCS magnetic media coagulation and sedimentation systems and other facilities. The scale of treatment 8 10,000 m3 / d, raised the effluent standard to the national A level of A in the Pollutant Discharge Standard for Urban Sewage Treatment Plants (GB18918-2002), which significantly reduced COD, BOD, total nitrogen, total phosphorus and other pollutants Content, which provides a strong support for the improvement of the water environment in Jiangmen City, especially the comprehensive management of black and odorous water bodies.

Case 4 Hangzhou Hangzhou sewage treatment emergency upgrade

With the in-depth development of Yuhang's "five waters for common treatment, pollution control first" work, the amount of new sewage in Yuhang District has increased year by year. In order to improve the sewage treatment capacity in Yuhang District, and ensure that the sewage is discharged quickly. The project will upgrade the existing Qiaosi emergency sewage treatment point and build a new pumping station emergency sewage treatment point. The total sewage treatment capacity will reach 40,000 tons / day. This project adopts the ReCoMag ultra-magnetic separation water purification equipment + non-blocking aerated biological filter process of environmental energy technology, which effectively removes suspended matter, total phosphorus and ammonia nitrogen, and discharges after the effluent index reaches level B (without assessment of TN).

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