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A New Focus —— Photovoltaic Wastewater Treatment

Time: 2023-09-01

There are many equipment in the wastewater treatment plant and the operation time is long, so it is a large electricity consumer. According to statistics, the average power consumption of urban sewage treatment plants in my country is 0.292 KWh/m³, and power consumption has gradually become one of the key factors for cost control of sewage plants.

China has issued a document to encourage sewage treatment companies to make comprehensive use of site space and adopt the model of "spontaneous self-use and surplus to the grid" to build photovoltaic power generation projects.


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However, due to problems such as long spans of sewage treatment plant pools, many underground pipelines, high obstacles, and construction difficulties, the "sewage plant + photovoltaic" project has not been implemented on a large scale.

Under the double carbon target, energy conservation and consumption reduction of sewage treatment plants are put on the agenda. Professionals believe that if more than 4,000 sewage treatment plants across the country can build an average of 5 megawatts of photovoltaic power stations in each sewage plant, then these sewage plants can be built The scale of photovoltaic power plants will exceed 20 billion watts.

In order to improve the efficiency and water quality of sewage treatment, more and more sewage plants have begun to explore the mode of photovoltaic power generation, and the partnership of sewage treatment plants + photovoltaic power plants is also increasingly appearing in the public's field of vision.

Composition characteristics of photovoltaic wastewater

The existence of a large amount of wastewater will cause serious pollution to the ecological environment, and at the same time restrict the sustainable and rapid development of enterprises in the industry. Photovoltaic industrial wastewater is characterized by strong acid and alkali corrosion and high content of suspended solids in water. The low pH value can be less than 2, showing high acidity; the high value can be greater than 12, showing high alkalinity; and the water contains a lot of suspended solids, and the suspended solids content in the water.

At the same time, because the industrial wastewater is rich in polymer polyethylene glycol, the COD content of the wastewater is high, showing that the water body is highly polluted by organic matter.


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The concept of photovoltaic wastewater treatment

Carry out classification pretreatment and pH adjustment treatment for various types of wastewater according to their respective characteristics, remove suspended solids in industrial wastewater, eliminate acid-base corrosiveness of wastewater, and reduce COD content of wastewater, so that the pH value and suspended solids of wastewater Indexes such as content and COD value meet the requirements of subsequent biochemical system treatment of wastewater.

Comprehensive water quality characteristics, pretreatment of acidic wastewater, alkaline wastewater, etc., using a pretreatment process combining natural sedimentation and plate-and-frame filter press separation, and using wastewater mixing pH adjustment technology to purify water and adjust water pH. Eliminate the impact on wastewater treatment due to differences in wastewater quality.

According to different types of waste water, it can be mixed evenly according to the needs to improve the water quality of the waste water, so that the water quality of the waste water is stable and the acid-base corrosion of the waste water is reduced. Due to the high salinity and high content of organic matter in the wastewater, and considering the refractory properties of polymers in the wastewater, the aeration air flotation and flocculation sedimentation treatment process is used to pre-treat the wastewater before entering the biochemical system, and the wastewater is mixed with other wastewater Finally, physical and chemical flocculation and sedimentation are carried out as a pretreatment measure before entering the biochemical system.



According to data from the Ministry of Housing and Urban-Rural Development of China, China has built more than 5,000 urban sewage treatment plants (excluding township sewage treatment plants and industries), with a sewage treatment capacity of 210 million cubic meters per day. According to the estimation of professional institutions, according to the estimation of the average photovoltaic capacity of 5MW that can be built in each sewage treatment plant, the scale of photovoltaic power stations that can be built in sewage treatment plants in China will exceed 25GW. From this point of view, the market prospect of water quality monitoring industry is broad.

The treatment of photovoltaic wastewater depends on the measurement of COD and suspended solids in water. COD sensors and suspended solids sensors of Chemins Technology can monitor relevant data in water bodies in real time, and can provide efficient and fast water body monitoring services for the "photovoltaic + water affairs" industry. The two sensors can effectively meet the test of water treatment results and see the effect of water treatment.