How to treat sewage from sugar refinery

In the production process of the sugar refinery, a large amount of wastewater will inevitably be produced. If the wastewater is directly discharged into the environment, it will have a serious impact on the surrounding ecological environment, and even pose a threat to people's life and health. Therefore, the sugar refinery needs to adopt a scientific sewage treatment process to treat the wastewater into a water quality that meets the discharge standards.

As a sewage treatment engineer, let us introduce the sewage treatment process of the sugar refinery:
primary treatment
The wastewater produced by the sugar refinery contains a large amount of suspended solids and impurities and needs primary treatment first. Generally, physical and chemical treatment methods are used to remove suspended solids and impurities in wastewater to make it more transparent.
Physical treatment usually uses a grid decontamination device to filter out large particles and impurities in the wastewater to prevent clogging of the next step of the equipment. Chemical treatment, on the other hand, uses coagulants to agglomerate tiny particles in wastewater into larger ones, making them easier to remove.

biochemical treatment
Biochemical treatment is the process of decomposing organic matter in wastewater into harmless substances. In the sewage treatment of sucrose refinery, the activated sludge method is generally used for biochemical treatment. The activated sludge method is to add activated sludge containing a large number of microorganisms to the wastewater, and through the metabolism of microorganisms, the organic matter in the wastewater is decomposed into harmless substances.
The key to biochemical treatment is to control the number and activity of microorganisms in the pool, as well as the control of oxygen supply. This requires strict control and adjustment of the temperature, pH value, and nutrients in the pool to achieve the best treatment effect.

Precipitation treatment
The sewage after biochemical treatment still contains a large number of tiny particles and colloids, which need further sedimentation treatment. Generally, the secondary settling tank process is adopted, and the sewage flows slowly in the secondary settling tank, and the suspended solids and colloids in the sewage are deposited to the bottom of the tank through gravity sedimentation to form a sludge layer, and the purified water flows out from the upper part.

Filtration
The sewage after sedimentation treatment still contains some tiny suspended matter, such as microbes and colloids, which need to be further filtered. Generally, a sand filter is used for filtration treatment, and the sewage is filtered through layers of filter media with different particle sizes to remove residual tiny suspended solids and colloids, making the water more clear and transparent.

Disinfection
The sewage treated by the above processes has met the discharge standards, but in order to ensure safer water quality, it needs to be disinfected. Generally, chlorine gas disinfection or ultraviolet disinfection is used to kill residual bacteria and viruses and ensure that the discharged water quality meets national standards.

Through the above treatment process, the wastewater from the sugar refinery can be safely and effectively disposed of, achieving the purpose of environmental protection.

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