What process is good for photovoltaic wastewater treatment? Kang Jinghui will talk to you about what process is good for photovoltaic wastewater treatment?
With the rapid development of the photovoltaic industry, the amount of wastewater generated by the photovoltaic industry has gradually increased, and the problem of photovoltaic wastewater treatment has become increasingly prominent.
As an emerging wastewater treatment technology, photovoltaic wastewater treatment has many advantages, but there are also some pain points and difficulties. Kang Jinghui will introduce the methods of photovoltaic wastewater treatment and their advantages and disadvantages in detail today, and put forward solutions and suggestions for its pain points and difficulties.
1. Difficulties in photovoltaic wastewater treatment.
1. The quality of wastewater fluctuates greatly.
Due to the characteristics of its discharge, the water quality of photovoltaic wastewater fluctuates greatly, which is difficult to control and control. In membrane separation technology, the size of the membrane pore size is difficult to adapt to the separation of substances of different sizes at the same time, and it is easy to have problems such as membrane blockage and pollution. In activated carbon adsorption, the adsorption effect of different substances varies greatly, and it is difficult to achieve the ideal adsorption effect. In electrochemical treatment, the electrochemical reaction conditions of different pollutant substances are quite different, and it is difficult to meet different treatment needs at the same time.
2. The cost of wastewater treatment is high.
Although photovoltaic wastewater treatment technology has been widely used, the equipment, materials, operation and maintenance costs required are relatively high. Due to the fact that the wastewater treatment equipment mostly uses imported equipment, the first is higher, and the wastewater treatment capacity is larger, so that the maintenance and replacement frequency of the equipment also increases accordingly, resulting in an increase in the cost of wastewater treatment.
3. The effect of wastewater treatment is unstable.
Due to the wide variety and uneven content of pollutants in photovoltaic wastewater, it is difficult to achieve the ideal treatment effect with a single treatment technology. In the actual operation process, it is often necessary to use a combination of different technologies to treat wastewater, which not only increases the equipment investment cost and treatment difficulty, but also easily leads to unstable treatment results.
2. Common processes for photovoltaic wastewater treatment.
Photovoltaic wastewater treatment adopts a combination of processes, including chemical precipitation, redox method, adsorption method, membrane separation method, etc. Among them, chemical precipitation and redox are the main methods for treating photovoltaic wastewater.
The chemical precipitation method is to add chemicals to the wastewater, so that the heavy metal ions in the wastewater and the chemicals undergo a chemical reaction to form a water-insoluble precipitate, so as to separate the heavy metal ions from the wastewater. Commonly used agents include lime, sulfate, hydroxide, etc.
The redox method is to add oxidants or reducing agents to the wastewater to make the heavy metal ions in the wastewater oxidize or reduce the reaction, so as to separate the heavy metal ions from the wastewater. Commonly used oxidants include chlorine, permanganate ions, hypochlorite ions, etc., and commonly used reducing agents include ferrous sulfate, nitrite, etc.
The adsorption method uses the adsorption of adsorbents to separate heavy metal ions from wastewater. Commonly used adsorbents include activated carbon, zeolite, diatomaceous earth, etc.
The membrane separation method uses the osmotic effect of the membrane to make the heavy metal ions in the wastewater be intercepted on one side of the membrane through the filtration effect of the membrane, so as to realize the separation of heavy metal ions. Commonly used membrane separation technologies include reverse osmosis, electrodialysis, etc.
These processes have their own advantages and disadvantages, and should be selected and combined according to the actual situation to achieve good treatment results. At the same time, photovoltaic wastewater treatment should also consider factors such as the amount of wastewater, water quality, and treatment cost, and select appropriate treatment processes and technologies.
What process is used for photovoltaic wastewater treatment?
For different types of wastewater, mix and evenly improve the water quality of wastewater according to needs, so that the water quality of wastewater is stable and the acid and alkali corrosiveness of wastewater is reduced. Due to the high salt content and high organic matter content in the wastewater, and considering the refractory degradability of the polymers in the wastewater, the aeration air flotation and flocculation and sedimentation treatment process was selected to pre-treat the wastewater before entering the biochemical system, and the physicochemical flocculation and precipitation were carried out after the wastewater was mixed with other wastewater as a pretreatment measure before entering the biochemical system.
After the wastewater is pretreated and flocculated and precipitated, the SS value and salinity are greatly reduced, but the concentration of organic matter in the wastewater is still very high, and the polymer is difficult to degrade, coupled with the unbalanced nutrition of the wastewater, the use of anaerobic bacteria and aerobic bacteria in the activated sludge to degrade and remove the organic matter in the wastewater, the use of multi-stage biochemical treatment process, the photovoltaic wastewater pretreatment combined with evaporation and concentration process, can better reflect the reliability and economy of the technology.
Countermeasures for the difficulties of photovoltaic wastewater treatment
A combination of different technologies is used to treat wastewater to achieve comprehensive treatment of a variety of polluting substances; Different treatment technologies are selected for the combination of specific pollutants in photovoltaic wastewater; Establish an intelligent control system to realize the automatic control and intelligent management of the wastewater treatment process; Strengthen the monitoring and data analysis in the wastewater treatment process, adjust the treatment process parameters in time, and improve the stability of the treatment effect.