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    Home > Process > Sewage treatment process

    Introduction of water treatment

    Source: Author: Time: 2016-08-08 11:05:58 Views: Times

    Water treatment method:
    There are two treatment methods for reclaimed water due to different uses. 1. One method is to directly reuse it into daily life, that is, to achieve direct recycling of water resources. This treatment method is suitable for extreme lack of water resources. Area, but high investment and complicated technology;
    2. The other is the standard for treating it to non-drinking water, which is mainly used for water that does not come into direct contact with the human body, such as toilet flushing, floor, car cleaning, greening and watering, fire protection, and general industrial water. Normal water treatment.

    According to the treatment method, the water treatment process is generally divided into 3 types:
    1 . Physical treatment method:

    Membrane filtration method is applicable to the situation where the water quality changes greatly.
    The characteristics of this process are: the device is compact, easy to operate, and less affected by load changes.
    The membrane filtration method is the action of an external force, the separated solution flows along the surface of the filter membrane at a certain flow rate, the solvent and low molecular weight substances, inorganic ions in the solution penetrate the filter membrane from the high pressure side into the low pressure side, and are discharged as filtrate ; And the polymer materials, colloidal particles and microorganisms in the solution are trapped by the ultrafiltration membrane, and the solution is concentrated and discharged in a concentrated form.
    2 . Physical Chemistry Method:

    Applicable to the situation where the quality of sewage water changes greatly. Generally used methods are: sand filtration, activated carbon adsorption, flotation, coagulation and precipitation. The characteristics of this process are: using hollow fiber ultrafiltration for processing, advanced technology, compact structure, small footprint, intermittent system operation, and simple management.
    3. Biological treatment method is suitable for sewage with high organic content. Biological treatment methods such as activated sludge method, contact oxidation method, biological turntable are generally used. It can be used alone or in combination with several biological treatment methods, such as contact oxidation + biological filter; biological filter + activated carbon adsorption; rotary table ten sand filtration and other processes. This process has the advantages of strong ability to adapt to changes in hydraulic load, less sludge generation, and easy maintenance and management.
    At present, due to the excessive and unrestrained development of water resources in some countries and regions, and the poor awareness of environmental protection, both surface water and groundwater have been polluted to varying degrees, and fresh water supplies with good water quality have been affected. Restrictions; secondly, the fresh water source to be developed is far from the centralized water supply point, and the one-time investment cost is high, so that some water scarce areas cannot expand the water supply capacity. To the extent of non-drinking, the concept of reclaimed water is introduced here. Reclaimed water is the reuse of high-quality miscellaneous drainage (excluding feces and kitchen drainage), miscellaneous drainage (excluding fecal sewage) and domestic sewage (waste) water that people have used in daily life and production. Used as miscellaneous water that is not in direct contact with the human body such as ground cleaning, watering flowers, car washing, air conditioning cooling, toilet flushing, fire fighting, etc. Because its water quality index is lower than the drinking water quality standard in urban water supply, but higher than the sewage discharge standard allowed to be discharged into the surface water body, that is, its water quality is between the quality of domestic drinking water and the sewage discharge standard, it is named " Reclaimed water. "
    Reclaimed water development and reuse technologies have recently developed rapidly, and have been widely used in the United States, Japan, India, the United Kingdom and other countries (especially Japan). These countries have determined the reclaimed water reuse technology suitable for their national conditions and national strengths based on their national and regional characteristics, so that the reclaimed water reuse technology has become more and more perfect. In China, this technology has been valued by governments at all levels and relevant departments and has done a lot of theoretical research and practical work on the reuse of water in buildings. It has been carried out in many cities across the country such as Shenzhen, Beijing, Qingdao, Tianjin, Taiyuan, etc. The operation of the project has achieved significant results.
    According to the size and scale of the scope of supply of reclaimed water treatment and reuse systems, there are generally the following four categories:
    1. Reclaimed water reuse system for unit buildings in areas with complete drainage facilities The source of water and water in this system is taken from miscellaneous water and high-quality miscellaneous drainage in the system. The drainage is used for flushing toilets, cleaning vehicles, greening, etc. in the building after being collected. Its processing facilities can be located inside or near the outside of the building according to conditions. For example, the water treatment equipment of Beijing New Wanshou Hotel is located in the basement.
    2. Units in areas with inadequate drainage facilities Reclaimed water system for urban buildings In areas with unsound urban drainage systems, water treatment facilities fail to meet secondary treatment standards. Reuse of reclaimed water can reduce re-pollution of local rivers by sewage.
    The water and water source in this system is taken from the tough drainage purification ponds of the building (such as sedimentation tanks, septic tanks, degreasing tanks, etc.), and the water in the ponds is the total domestic sewage. The system processing facilities can be located indoors or outdoors depending on the conditions.
    3. Reclaimed water reuse system for small-area building complex The reclaimed water source of this system is taken from the miscellaneous drainage generated by various buildings in the building community. This system can be used to build residential quarters, schools, and institutional compound courtyards. Its processing facilities are placed in the community.
    4. Reclaimed water reuse system for regional buildings The system is characterized by secondary sewage treatment facilities in small areas. The source of reclaimed water in the area can be the water treated by the urban sewage treatment plant or the industrial wastewater, and the water is transported to the reclaimed water treatment station in the area After further processing, it is used for toilet flushing and greening in the building.

    The water and water source in this system is taken from the tough drainage purification ponds of the building (such as sedimentation tanks, septic tanks, degreasing tanks, etc.), and the water in the ponds is the total domestic sewage. The system processing facilities can be located indoors or outdoors depending on the conditions.
    3. Reclaimed water reuse system for small-area building complex The reclaimed water source of this system is taken from the miscellaneous drainage generated by various buildings in the building community. This system can be used to build residential quarters, schools, and institutional compound courtyards. Its processing facilities are placed in the community.
    4. Reclaimed water reuse system for regional buildings The system is characterized by secondary sewage treatment facilities in small areas. The source of reclaimed water in the area can be the water treated by the urban sewage treatment plant or the industrial wastewater, and the water is transported to the reclaimed water treatment station in the area After further processing, it is used for toilet flushing and greening in the building.

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