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  • 你知道废水处理的方法吗?
  • 本站编辑:江西泽川环保科技有限公司发布日期:2019-09-17 16:56 浏览次数:

按作用分

废水处理按照其作用可分为物理法、生物法和化学法三种。

According to its function, wastewater treatment can be divided into physical method, biological method and chemical method.

①物理法:主要利用物理作用分离废水中的非溶解性物质,在处理过程中不改变化学性质。常用的有重力分离、离心分离、反渗透、气浮等。物理法处理构筑物较简单、经济,用于村镇水体容量大、自净能力强、废水处理程度要求不高的情况。

Physical method: The main use of physical action to separate insoluble substances in wastewater, in the treatment process does not change the chemical properties. Commonly used are gravity separation, centrifugal separation, reverse osmosis, air flotation and so on. Physical treatment is simple and economical, which can be used in the case of large capacity of water body, strong self-purification ability and low requirement of wastewater treatment in villages and towns.

②生物法:利用微生物的新陈代谢功能,将废水中呈溶解或胶体状态的有机物分解氧化为稳定的无机物质,使废水得到净化。常用的有活性污泥法和生物膜法。生物法处理程度比物理法要高。

(2) Biological method: By utilizing the metabolic function of microorganisms, the dissolved or colloidal organic matter in wastewater can be decomposed and oxidized into stable inorganic matter, so that the wastewater can be purified. Activated sludge process and biofilm process are commonly used. The degree of biological treatment is higher than that of physical treatment.

③化学法:是利用化学反应作用来处理或回收废水的溶解物质或胶体物质的方法,多用于工业废水。常用的有混凝法、中和法、氧化还原法、离子交换法等。化学处理法处理效果好、费用高,多用作生化处理后的出水,作进一步的处理,提高出水水质。

(3) Chemical method: It is a method of treating or recovering dissolved or colloidal substances from wastewater by chemical reaction, which is mostly used in industrial wastewater. The commonly used methods are coagulation, neutralization, redox and ion exchange. Chemical treatment method has good treatment effect and high cost. It is mostly used as effluent after biochemical treatment for further treatment to improve the quality of effluent.

按处理程度分

According to the degree of treatment

废水处理按照处理程度来分可分为一级处理、二级处理和三级处理。

Wastewater treatment can be divided into primary treatment, secondary treatment and tertiary treatment according to the degree of treatment.

一级处理主要是去除废水中呈悬浮状态的固体物质,常用物理法。一级处理后的废水BOD去除率只有20%,仍不宜排放,还须进行二级处理。二级处理的主要任务是大幅度去除废水中呈胶体和溶解状态的有机物,BOD去除率为80%~90%。一般经过二级处理的废水就可以达到排放标准,常用活性污泥法和生物膜处理法。三级处理的目的是进一步去除某种特殊的污染物质,如除氟、除磷等,属于深度处理,常用化学法。

The primary treatment is mainly to remove suspended solid substances from wastewater, which is commonly used by physical methods. The BOD removal rate of wastewater after primary treatment is only 20%, which is not suitable for discharge, and secondary treatment is also needed. The main task of secondary treatment is to remove colloidal and dissolved organic matter from wastewater by a large margin. The removal rate of BOD is 80%-90%. Generally, the wastewater after secondary treatment can meet the discharge standard. Activated sludge method and biofilm treatment method are commonly used. The purpose of tertiary treatment is to further remove some special pollutants, such as fluoride and phosphorus, which belong to advanced treatment and commonly used chemical methods.

废水工艺流程选型要求 1、对现有一级处理工艺进行加强处理效果的改造 改造应根据实际情况,充分利用现有处理设施,对现有医院中应用较多的化粪池、接触池在结构或运行方式上进行改造,必要时增设部分设施,尽可能地提高处理效果,以达到医院废水处理的排放标准。

Requirements of wastewater process selection 1. To improve the treatment effect of existing primary treatment processes, we should make full use of the existing treatment facilities according to the actual situation, transform the structure or operation mode of septic tanks and contact tanks which are widely used in existing hospitals, add some facilities when necessary, and try our best to make full use of the existing treatment facilities. Improve the treatment effect to meet the discharge standard of hospital wastewater treatment.