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Summary of biological methods for sewage treatment —— Biological Aerobic Process

時間:2020-07-30 ヒット数: 25


1. Activated Sludge Process

It has the advantages of relatively low investment and better treatment effect. This technology mixes wastewater and activated sludge (microorganisms) and aerates them to decompose organic pollutants in the printing and dyeing wastewater.

Biosolids are then separated from the treated wastewater, and part of the solids can be returned to the aeration tank as needed.

Activated sludge can not only decompose a large amount of organic matter, but also remove part of the color, in addition to fine-tuning the pH value. It has high operating efficiency, low cost and good effluent quality, and is suitable for treating printing and dyeing wastewater.


2. SBR Process

Sequencing Batch Reactor(SBR) is an activated sludge wastewater treatment technology operated by intermittent aeration.

This technology has two advantages: the push-flow effect in time and the complete mixing in space, which makes it a highly potential process for the treatment of refractory organic matter.

3. Biofilm Process

The biofilm process is a method of treating wastewater through the biofilm grown on the surface of the filler (such as filter material, disk surface, etc.). The Biofilm method has better decolorization effect on printing and dyeing wastewater than the activated sludge method.

Biofilm process has many forms in the treatment of printing and dyeing wastewater, mainly including contact oxidation method and biological filter.

Because the printing and dyeing wastewater has the characteristics of high concentration and difficult to degrade, it is difficult for the pure biofilm method to achieve satisfactory treatment effects in the treatment of printing and dyeing wastewater.

4. Bio-Contact Oxidation Process

This process is derived from the biofilm process and combines the advantages of both the activated sludge process and the biofilm process.

The biofilm is composed of micelles, filamentous bacteria, fungi, protozoa and metazoa. The wastewater is in contact with the biofilm. Under aerobic conditions, the biofilm adsorbs the organic matter in the wastewater. Organic matter is oxidized and decomposed by microorganisms, which can purify wastewater.

Because of its characteristics of small volume load, less land occupation, less sludge, convenient management, and degradable special organic matter, it has been widely used in printing and dyeing industrial wastewater in recent years.

5. MBR Process

MBR, also known as membrane bioreactor, is a new type of water treatment technology that combines activated sludge process and membrane separation technology.

There are many types of membranes, and there are many different types classified in different ways:

①According to the separation mechanism, it can be divided into reactive membrane, ion exchange membrane, permeable membrane, etc.;

②According to the nature of the membrane, it can be divided into natural membrane (biomembrane) and synthetic membrane (organic membrane and inorganic membrane);

③According to the structure of the membrane classification can be divided into flat type, tube type, spiral type and hollow fiber type.

In the MBR process, the membrane separation module can not only increase the concentration and activity of certain obligate bacteria, but also intercept large molecules that are difficult to degrade. While treating waste water, chemical raw materials can also be recycled, and part of the water discharged after treatment can meet the standard for reuse.

In actual application, people found that when using MBR process, the length of residence time of wastewater has a greater impact on the removal rate. The residence time is long and the removal rate is relatively high. But the residence time should not be too long, otherwise it will cause the reduction of sludge concentration (MLSS).