Waste water treatment plant is an important part of industrial wastewater treatment process. The waste water treatment plant can be divided into two parts: biological treatment system and physical treatment system. In the biological treatment system, the waste water will be treated by microorganism which can decompose organic matter in the waste water. After the biological treatment, the effluent will be sent to the physical treatment system. In this stage, the waste water will go through sand filter or gravel filter to remove solid particles. Then it will be discharged out to the environment after passing through the final sedimentation tank.

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