comparison of several advanced sewage treatment technology
Release Date:2018-6-28 Source:xiashundong Views:958
One, continuous cycle aeration system (CCAS)
The CCAS process, the Continuous Cycle Aeration System, is a continuous intake SBR aeration system. This process is improved on the basis of SBR (Sequencing Batch Reactor, sequencing batch process). As early as 1914, SBR technology was developed successfully, but it is difficult to be popularized in large sewage treatment plant because of the problems of manual operation and management, the backwardness of monitoring means and the easy blockage of aerator. SBR technology has been generally considered suitable for small-scale sewage treatment plants. Since 60s, the automatic control technology and monitoring technology have developed rapidly, and the new type of non blocking microporous aerator has been developed successfully, which creates conditions for the extensive use of intermittent treatment. In 1968, the University of New South Wales in Australia and the United States ABJ co developed a "intermittent reactor system of continuous influent, periodic drainage, delayed aerated aerobic activated sludge process". In 1986, the National Environmental Protection Administration officially recognized that the CCAS process is an innovative alternative technology (I/A), and has become the most advanced computer controlled biological phosphorus removal and denitrification processing technology at present.
The CCAS process does not require the pretreatment of sewage, only the mechanical grille and the grit chamber with 15mm clearance are provided. The core of biological treatment is the CCAS reaction cell. The functions of phosphorus removal, nitrogen removal, degradation of organic matter and suspended solids are all completed in the pool, and the effluent can meet the standard discharge.
The pretreated wastewater continuously enters the pre reaction pool in the front of the reaction pool. Most of the soluble BOD in the sewage is adsorbed by Activated Sludge Microbes, and enters the reaction zone at low flow rate (0.03-0.05m/min) from the hole in the lower part of the main and prereaction zone. In the main reaction area, according to the cycle of "aeration (Aeration), Idle, Settle, and Decant", the sewage can be decarbonization and denitrification in the "aerobic and anoxic" process, and the phosphorus removal is completed in the "aerobic anaerobic" repetition. The duration of each process and the operation of the corresponding equipment are controlled by the computer in advance, and the adjustable procedures are centralized and controlled by the computer.

The unique structure and operation mode of CCAS technology has unique advantages in technology.
(1) when sewage is aerated, the sewage and sludge are perfectly mixed, ensuring the removal rate of BOD and COD, and the removal rate is as high as 95%.
(2) the repeated operation mode of "aerobic anoxia" and "aerobic anaerobic" strengthened the absorption of phosphorus and nitrification denitrification, which made the removal rate of nitrogen and phosphorus up to 80%, which ensured the quality of the effluent.
(3) when the sediment is deposited, the whole CCAS reaction tank is completely ideally precipitated so that the suspended solids (SS) of the effluent are very low, and the low SS value also ensures the phosphorus removal effect.
The disadvantage of the CCAS process is that each pool is running at the same time. Manual control is almost impossible. It is controlled by computer. The quality of the management personnel of the processing plant is high, and the requirements for the work of design, training, installation and debugging are strict.

Two and SPR high turbidity wastewater treatment technology
The latest invention of "SPR high turbidity sewage purification system" (United States invention patent) combined the "first level treatment" and "three stage treatment" process in a SPR sewage purifier, and completed it quickly in the 30 minute process. It allows direct inhalation of suspended matter (turbidity) up to 500 mg / L to 5000 mg / L of high turbidity sewage. The suspended substance (turbidity) of treated effluent is lower than 3 mg / L (degree); it allows direct inhalation of CODcr 200 mg / L to 800 mg / L of high concentration organic sewage, and the CODcr in the effluent can be reduced to 40 mg / L below. . Only with the engineering investment of the conventional one or two grade sewage treatment plant and the operating costs lower than the conventional two grade treatment, the effect of the three level treatment level can be obtained, and the regeneration and reuse of urban sewage can be realized.
SPR wastewater treatment system first uses chemical methods to precipitate dissolved pollutants from true solution state to form particles with solid phase interfaces or tiny suspended particles. Organic pollutants and chromaticity are separated from sewage with efficient and economical adsorbents; and then micro physical adsorption is used to treat sewage in sewage. All kinds of particles and suspended particles are condensed into large and dense flocs; by the principle of hydromechanics, such as swirling flow and filtration hydraulics, the floc and water are quickly separated in a self designed SPR high turbidity sewage purifier, and the level of three grade treatment is reached after the water is filtered through the self formed dense suspended mud layer of the self formed in the tank. The effluent can be reused; the sludge is highly concentrated in the concentrating room and discharged by pressure regularly. Because of the low water content and good dewatering performance of the sludge, the sludge can be directly sent into the mechanical dehydration device. The sludge cake after dehydration can also be used to make the pavement brick, and two times of pollution have been avoided.
The newly invented SPR sewage purification technology will create a new road for the reuse of urban sewage in the world, with its simple and reliable process, low investment and operation cost, less land occupation and good purification effect. After the urban sewage is reused, it provides second fresh water source for the city, which provides the necessary conditions for the sustainable development of the city, and its economic and social benefits are immeasurable.

Three and BIOLAK sewage treatment technology
The baraca process is a multi-stage activated sludge sewage treatment system with the function of phosphorus and nitrogen removal. It is a sewage treatment system developed from natural pond as reaction pond. Since 1972, after many years of research, the use of the earth pond structure and the use of floating on the surface of the mobile form.

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