Waster Water Treatment Commonly Used Pharmacy
Waster Water Treatment commonly used Pharmacy:
⑴ flocculant: sometimes called coagulant, can be used as a means to strengthen the solid-liquid separation, for the primary settling tank, Waster Water Treatment the second settling tank, flotation tank and three-level treatment or deep processing process.
⑵ coagulant: auxiliary flocculant play a role in strengthening the coagulation effect.
⑶ conditioning agent: also known as dehydrating agent for the treatment of excess sludge before dehydration, the varieties include the above part of the flocculant and coagulant.
⑷ demulsifier: sometimes called desorption agent, mainly used for emulsified oil containing oily wastewater pre-treatment, which includes the above part of the flocculant and coagulant.
⑸ defoamers: mainly used to eliminate the aeration or mixing process in the emergence of a large number of foam.
⑹ pH adjustment agent: for the acidic wastewater and alkaline wastewater pH adjusted to neutral.
(7) Oxidative reducing agent: It is used for the treatment of industrial waste water containing oxidizing substances or reducing substances.
⑻ disinfectant: used in the Waster Water Treatment after discharge or reuse before disinfection.
Waster Water Treatment grading
According to the degree of treatment, Waster Water Treatment (mainly urban sewage and some industrial wastewater) can be divided into three levels.
The task of the primary treatment is to remove the solid contaminants in the suspended state from the wastewater. To this end, the use of physical processing. After the primary treatment, the removal rate of suspended solids is 70% ~ 80%, while the removal rate of biochemical oxygen demand (BOD) is only about 25% ~ 40%, the degree of purification of waste water is not high.
The task of secondary treatment is to substantially remove the organic pollutants from the wastewater. Take BOD as an example. After the secondary treatment, the BOD in the wastewater
Removal of 80% to 90%, such as urban sewage treatment of BOD content of water can be less than 30 mg / l. Waster Water Treatment Most of the various processing units for aerobic biological treatment can meet this requirement.
The task of the tertiary treatment is to further remove the contaminants that have not been removed by the secondary treatment, including organic matter, phosphorus, nitrogen and soluble inorganic matter that the microorganisms have not degraded.
Level 3 processing is synonymous with advanced processing, but the two are not exactly the same. Three-stage treatment is a two-stage treatment, in order to remove a specific pollutant from the wastewater, such as phosphorus, nitrogen, etc., and add one or more processing units; advanced treatment is often based on waste water recovery, Waster Water Treatment complex For the purpose, after the secondary processing of the additional processing unit or system. Third-level processing costly, management is also more complex, but can make full use of water resources. A few countries have built some sewage treatment plants.