Coconut industry wastewater mainly comes from various links of coconut processing industry. The wastewater of this project comes from the effluent of the previous water treatment system. The wastewater has poor biodegradability, high oil and grease content, high concentration of nitrate and phosphate, and a certain amount of ammonia and surfactant.
If these wastewaters are discharged directly without treatment, they will cause serious pollution to the water quality of the receiving water bodies and cannot be recycled.
Entrusted by an overseas client company, Shanqing Environment is responsible for scheme design, equipment selection, installation guidance, commissioning, training and other work in this project to ensure that the effluent meets the relevant standards and that the treated water can be reused for process and product water, direct cooling water, open circulating cooling water system make-up water, washing water and other purposes.
一、Design conditions
1.1 Design water volume
According to the relevant information provided by the customer, the treatment capacity of the sewage treatment facility of this project is 40 gpm, that is: 10 tons/hour, 220 tons/day.
1.2 Influent water quality
The source of sewage is the effluent from the coconut industry after pretreatment. Combined with the relevant information provided by the customer , the inlet water quality parameters are as follows.
1.3 Outlet water quality
According to the relevant standards in "Water Quality for Industrial Water Use in Urban Wastewater Recycling" (GB/T 19923-2005), the effluent can be reused for process and product water, direct cooling water, make-up water for open circulating cooling water systems, washing water, etc.
2. Process
The wastewater of this project comes from the effluent of the existing coconut wastewater treatment system. It is planned to treat the wastewater with zero discharge for reuse. In view of the characteristics of the water quality, Shanqing Environment will send the wastewater through the collection pipe to the regulating tank. After the water quality is homogenized, it will enter the ozone oxidation tower through the regulating tank lifting pump. The wastewater in the ozone catalytic tower contains a large amount of hydroxyl free radicals, which have extremely strong oxidizing properties and can break the chains of high-molecular organic pollutants, reduce COD indicators, and achieve integrated influent biochemical indicators.
After the wastewater has completed the integrated biochemical reaction, the effluent passes through a quartz sand filter to remove remaining suspended matter, and then is disinfected to meet the reuse water standards.
Figure 1 Process flow chart
2.1 Process description:
(1) In view of the water quality of the wastewater inlet of this project, the sewage will be introduced into the equalization tank for equalization and regulation before entering the main treatment body, so that its water volume and water quality are relatively stable, so as to provide a stable and optimized operating condition for the subsequent water treatment system.
(2) Ozone oxidation tower
Ozone advanced oxidation technology can decompose and oxidize organic matter that is difficult to treat by traditional biochemical methods.
Ozone destroys the complex chemical structure of these substances through oxidation, converting them into small molecular organic compounds that are easier for microorganisms to degrade, thereby improving their removal efficiency in subsequent biochemical treatments while ensuring the normal operation of biochemical treatments.
(3) Biological contact oxidation pond
The biological contact oxidation tank can remove residual organic matter and ammonia nitrogen in the water in a relatively short time. After the wastewater is treated with ozone oxidation, it enters the biological contact oxidation tank, where organic substances such as oils and sugars in the wastewater can be efficiently degraded, thereby reducing the concentration of COD, oils, ammonia nitrogen, etc. in the wastewater. The biological contact oxidation tank and the secondary sedimentation tank are combined into an integrated device.
(4) Quartz sand filter
The quartz sand filter is a water treatment device that uses quartz sand as the main filter medium and is used to remove impurities such as suspended matter, colloids, and silt in water. After biochemical treatment, the wastewater enters the quartz sand filter, which can effectively remove solid suspended matter in the wastewater, and further remove the organic matter content in the wastewater, reducing the COD value, ammonia nitrogen and sulfate concentrations.
(5) Sodium hypochlorite generator
Sodium hypochlorite generator is a water treatment disinfection and sterilization equipment. It uses salt water as raw material and produces sodium hypochlorite solution through electrolysis reaction. Sodium hypochlorite has strong oxidizing properties and can be hydrolyzed to produce hypochlorous acid with strong oxidizing properties, which can effectively kill bacteria in treated water and ensure the quality of recycled water.
Shanqing Environment uses the above process to make the treated wastewater meet the discharge standards and be reused . The above cases and processes are for reference only. If you have other wastewater treatment related needs, please feel free to contact us for consultation. Shanqing Environment can provide you with more mature, reliable, efficient, energy-saving, low investment, low operating cost, and low secondary pollution water treatment processes and equipment.
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