Application of Water Treatment in Environmental Protection

1. Background.

Today’s society not only pays attention to economic construction but also focuses on the unity between economic construction and ecological environment development. Environmental protection engineering is the premise and foundation to achieve the goal of sustainable development. Reverse osmosis, as a special technology, has been widely used in all aspects of environmental protection and plays a very important role in the process of pure water production.

In environmental protection engineering, reverse osmosis technology is mainly used to control water pollution. Under the background of effectively improving the level of economic development, environmental protection has an increasing demand for the practical application of reverse osmosis technology. To cope with the current trend, NEWater company has put forward an effective method of technical optimization based on its full understanding and understanding of the application principle of RO technology.

Figure1 Water of Nature.

2. Advantages of Using Reverse Osmosis Technology for Water Treatment.

  • When reverse osmosis technology is applied, the device and equipment are small and they will not occupy a too large area. Moreover, the equipment operation is simple and easy to learn;
  • Less energy consumption. Reverse osmosis technology mainly uses osmotic pressure to effectively separate organic matter and water. When pressure is reduced or applied, water can be separated, and the energy consumption is much less than that of other technologies in the whole operation process;
  • No pollution. Reverse osmosis technology belongs to physical reaction and it will not cause environmental pollution when used, which is consistent with the tasks and objectives formulated in environmental protection engineering;
  • No heating and no phase transition. In the operation process, no heating instrument or water is required, and the whole operation process is relatively simple. In this case, the actual use-value of the technology can be improved.

Three kinds of RO water treatment equipment developed by NEWater have made substantial development in environmental protection applications such as heavy metal wastewater treatment, waste leachate treatment, and printing and dyeing wastewater treatment. The following describes how they promote the improvement of the water treatment effect and the realization of energy conservation and environmental protection.

3. Application of Reverse Osmosis Water Treatment in Environmental Protection.

3.1. Treatment of Heavy Metal Wastewater.

When reverse osmosis technology is applied in environmental protection, heavy metal wastewater treatment is a key content. In the treatment of heavy metal wastewater, ultra-low pressure reverse osmosis membrane separation is usually used, and the chromium ion and copper ion in the solution can also be diluted. After reverse osmosis treatment, the ion interception will be affected by the feed pressure. When the feed pressure increases, the ion interception will also increase. When the pressure reaches a certain value, the ion interception rate is more than 99%.

The application of this technology in environmental protection has promoted the continuous development of environmental protection projects. The wide application of reverse osmosis technology makes the overall efficiency of sewage treatment higher in sewage treatment. The treatment process of reverse osmosis technology in heavy metal wastewater is as follows:

  • Heavy Metal Wastewater → Chemical Treatment And Sedimentation Tank → Process Treatment Circulating Tank → Reverse Osmosis Concentration System → Permeate → Water Quality Adjustment Tank → Discharge To Wastewater → Return To The Original Water Inlet.
  • Nanofiltration Concentration System (Permeate can be from Nanofiltration Concentration System → Chemical Treatment and Sedimentation Tank) → Nanofiltration Process Circulating Tank (Concentrate from Process Treatment Circulating Tank → Nanofiltration Process Circulating Tank) → Concentrate → Metal Extraction Equipment.
  • It includes two circulation processes: Process Circulation Tank → Reverse Osmosis Concentration System → Circulating Concentrate → Process Circulation Tank; Nanofiltration Concentration System → Nanofiltration Process Circulating Tank → Nanofiltration Concentration System.

Figure2 Treatment process of reverse osmosis technology in heavy metal wastewater.

If the pressure difference of the heavy metal wastewater reverse osmosis water treatment equipment developed by NEWater is higher than a certain value and the temperature is 20 ~ 30 ℃, the concentration of the solution can reach ten times, or even more than ten times. After treatment, the sewage can be used for toilet flushing and greening plant irrigation, which has obvious environmental protection effects.

Figure3 Heavy metal wastewater reverse osmosis water treatment process equipment.

3.2. Waste Leachate Treatment.

The water quality of leachate produced by municipal solid waste is complex, and the water volume changes greatly. Generally, the concentration of harmful pollutants is high, especially the problem of high metal content and ammonia nitrogen content. At present, biological treatment technology is used in the treatment of municipal solid waste leachate at home and abroad. Reverse osmosis technology can achieve efficient interception of dissolved organic pollutants in water. Therefore, it has been widely used in recent years.

Figure4 Reverse osmosis process flow of waste leachate treatment.

The reverse osmosis process flow of landfill leachate treatment is as follows: Leachate Collection → Regulating Tank → Comprehensive Pretreatment → Denitrification Tank → Nitrification Tank → Ultrafiltration Host → Ultrafiltration Water Tank → Nanofiltration Host → Nanofiltration Water Tank → Reverse Osmosis Host → Clean Water Tank → Clean Water Discharge up to Standard, in which there is a Sludge Tank in the middle of Denitrification Tank → Nitrification Tank, including Sludge Treatment System. There is a Concentrated Liquid in the middle of the Nanofiltration Host → Nanofiltration Water Production Tank, including Concentration Treatment System.

Figure5 Reverse osmosis equipment for waste liquid treatment.

The landfill leachate treatment reverse osmosis equipment developed by NEWater can effectively treat and test the leachate scientifically. When the leachate concentration increases, the infiltration will be greatly reduced. When the operating pressure is increased, the removal rate can reach 98%, and the environmental protection effect is better.

3.3. Treatment of Printing and Dyeing Wastewater.

Printing and dyeing wastewater has a large amount of water, complex components, and high chromaticity. Generally, there are acid-base, dye, auxiliary, fiber, inorganic matter, etc. in printing and dyeing wastewater. Amine compounds, nitro compounds, zinc, copper, and other heavy metals in fuel belong to biological toxins. If these substances are discharged directly, the environmental pollution problem will be more serious.

The process of reverse osmosis desalination system for printing and dyeing wastewater is as follows: Secondary Treated Effluent → Ozone Contact Tank → Sand Filter → Self Backwashing Filter → UF Concentrated Water → UF Pretreatment Unit → Compressed Air → Intermediate Water Tank → Non-Oxidizing Bactericide → Scale Inhibitor& Reductant → Security Filter → Reverse Osmosis Membrane System Unit → Reverse Osmosis Concentrated Water → Reverse Osmosis Production Tank → Water Distribution Pipe Network. The circulating process is from UF Pretreatment Unit to Intermediate Water Tank.

Figure6 Process flow of reverse osmosis desalination system for printing and dyeing wastewater.

Reverse osmosis technology is more suitable for the separation of ions and macromolecules in printing and dyeing water. At present, the reverse osmosis equipment for printing and dyeing wastewater developed by NEWater has been used in the treatment of dyeing wastewater of synthetic fiber and cotton spinning mixture. When treating the wastewater, it is necessary to use aluminum coagulation, adjust the pH, and then use cross-flow microfiltration equipment to separate the wastewater.

The primary separation membrane can treat brackish water, the separation rate can be higher than 96%, the color separation rate can reach 90%, and the carbon separation rate can reach 87%; The secondary separation rate is higher than 98% and color separation rate can reach 94%. Therefore, the environmental protection performance has been greatly improved.

Figure7 Printing and dyeing wastewater reverse osmosis equipment.

4. Benefits of NEWater Reverse Osmosis Water Treatment System.

• Purifying Wastewater and Protecting Environment.

The direct discharge of domestic or industrial wastewater is very harmful to the natural environment. The wastewater contains a large number of harmful chemicals and particulate impurities. Direct discharge must create a vicious circle and lead to water pollution. Therefore, all wastewater cannot be discharged if it does not meet the specified discharge standards for environmental protection.

NEWater’s reverse osmosis water treatment system can effectively remove most impurities and organic pollutants in the wastewater so that the wastewater can meet the discharge standard. At the same time, after the wastewater is treated by a multi-stage reverse osmosis system, it can meet the drinking water standard. It can not only purify the sewage and protect the environment but also improve the utilization rate of water.

Figure8 Wastewater treatment plant.

• Saving Cost and Strengthening Economy.

At present, the global annual expenditure on environmental projects is as high as US $100 billion, and the amount has been rising. In contrast, hundreds of billions of cubic meters of wastewater are directly discharged worldwide every year, polluting the environment and causing the cost of environmental projects to continue to rise.

NEWater’s reverse osmosis water treatment system can purify wastewater, reduce environmental pollution and reduce the cost of environmental projects. In contrast, if the reverse osmosis system can be put into use, it can provide a large number of jobs and strengthen the economy. In addition, it will also strengthen the economic development of surrounding industries, such as the ecological home industry, water purification system industry, etc. Hence the reverse osmosis system can not only save costs but also promote the development of a virtuous economic cycle.

• Provide Electric Energy, Reduce Emissions and Reduce Carbon.

At present, many countries or regions in the world still focus on thermal power generation, which will lead to air pollution. The key is that thermal power plants mainly burn coal, and it is difficult to eliminate sulfur dioxide. In consequence, clean energy is urgently needed to replace thermal power generation. Among them, water is clean energy and inexhaustible. Compared with thermal power generation, it has natural advantages.

NEWater’s reverse osmosis water treatment system can rely on its power auxiliary system generated in the water treatment process to reduce power consumption. Meanwhile, if the water treatment plant makes rational use of terrain and other factors, the power generated by the reverse osmosis system can be used by itself, as well as selling the remaining power to the State Grid for public use.

Figure9 Thermal power.

The application of reverse osmosis water treatment has greatly improved people’s production and life. At present, energy conservation and environmental protection is a topic of concern. The application of reverse osmosis water treatment can promote the realization of energy conservation and environmental protection. In environmental protection engineering, the application of reverse osmosis water treatment can promote the improvement of the water treatment effect, which is more cutting-edge than the traditional water treatment technology.

If you have any water treatment needs in environmental protection projects, NEWater will work with you to plan and provide the most adequate reverse osmosis water treatment scheme, to contribute to the long-term development of environmental protection projects, protect the earth’s resources and achieve the goal of sustainable development.

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