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The Waste Water Treatment Generally Can Be Divided Into Three Grades

  According to the treatment degree, the waste water treatment generally can be divided into three grades.

  The task of level a processing is to remove solid contaminants from the waste water that are suspended. To this end, more use of physical treatment. Generally after first-order treatment, the removal rate of suspended solids is $number, and the removal rate of biochemical oxygen demand (BOD) is only about $number, and the purification degree of wastewater is not high.

  The two-level processing task is to significantly remove the organic pollutants in the waste water, taking bod as an example, generally through two-stage treatment, the waste water bod can be removed $number, such as urban sewage treatment after water bod content can be less than 30 mg/L. Most of the processing units of aerobic biological treatment can meet this requirement.

  The task of level three processing is to further remove contaminants that have not been removed by level two treatment, including organics, phosphorus, nitrogen and soluble inorganic compounds that have not been degraded by microorganisms.

  Level three processing is synonymous with advanced processing, but the two are not identical. Level three processing is processed by two, in order to remove a particular pollutant, such as phosphorus and nitrogen, from the waste water, and add one or more of the processing units; advanced treatment is often used for waste water recovery, reuse for the purpose, after the two-level treatment of the additional processing units or systems. Three-level processing is costly and management is complex, but it can make full use of water resources. A few countries have built some three-level sewage treatment plants.

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