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Automatic CASS reaction tank sludge age control system

An automatic control system and reaction pool technology, applied in water/sludge/sewage treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of difficulty in determining the timing of sludge discharge, excessive COD of effluent, and poor control of sludge age Accuracy and other issues, to achieve the effect of accurate calculation and stable mud volume

Inactive Publication Date: 2019-08-27
南通博恒环保科技有限公司
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Problems solved by technology

[0004] At present, there are common problems in the biochemical system of the CASS process in operation. 1. It is difficult to determine the timing of sludge discharge, and the COD of the effluent often exceeds the standard, and the TP value does not meet the standard.
2. Quantitative sludge discharge according to experience or when the effluent water quality exceeds the standard, the sludge age control is not accurate
3. Prevent suspended sludge from flowing out of the CASS reaction tank with the decanter, generally control one-third of the water output, and the system will lose a lot of processing capacity

Method used

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  • Automatic CASS reaction tank sludge age control system
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Embodiment Construction

[0041] Such as figure 1 with figure 2 , combined with the conclusion of the above theoretical demonstration, the implementation steps of the present invention will be described in detail through a case below. In order to simplify the entire elaboration process, the measurement units of each indicator in the case have been converted.

[0042] Case, CASS Reaction Pool T S Set to 26 days, the aerobic stage MLSS1 in the reaction pool is controlled at 4-5kg / m 3 , the effective volume V of the reaction pool is 100m 3 , the water output rate of the reaction pool is 35%, and the MLSS2 value in the water output index of the reaction pool is 0.08kg / m 3 Below, the flow Q of the sludge metering pump v 5m 3 / h, the measured value of MLSS3 of the discharged sludge concentration is 15-25kg / m 3 , the dissolved oxygen DO in the pretreatment section of the reaction pool is below 0.5, and the DO in the aerobic section is 2-4. The conventional process control is to discharge mud once a w...

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Abstract

The invention relates to a novel sewage treatment process, in particular to an automatic CASS reaction tank sludge age control system. The automatic CASS reaction tank sludge age control system comprises a water collecting tank, a CASS reaction tank, a sludge tank and a sand filter tank. Sewage is lifted from the water collecting tank to enter a CASS reaction tank pretreatment area, and then flowsinto a biological reaction area. Excess sludge precipitated after full reaction is accurately calculated by the control system and then is quantitatively delivered to the sludge tank by a sludge metering pump. The supernatant in the CASS reaction tank flows out of a water decanter and enters the sand filter tank. By applying the control system, the sludge age of the activated sludge in the CASS process can be controlled on line, so that the sludge quantity in the CASS reaction tank is more stable, the water decanter reaches 45% of the water outlet quantity, and the continuous stable standardreaching of the water quality of output water is ensured.

Description

technical field [0001] The invention relates to a new sewage treatment process, in particular to an automatic control system for the sludge age of a CASS reaction tank. Background technique [0002] The discharge of excess sludge in the biological sewage treatment process is the only means to control the sludge age of activated sludge, and the control of sludge discharge will directly affect the concentration of sludge in the bioreactor, and the length of sludge age determines the activated sludge age. The activity of sludge, the distribution of bacterial species and the sedimentation and separation performance of sludge. The concentration of sludge will directly determine the biodegradability of the system, and an appropriate sludge concentration is a necessary prerequisite for biodegradation. The sludge age plays a decisive role in the biodegradation rate of organic matter and ammonia nitrogen. A short sludge age is conducive to biological reproduction and absorption of ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/301C02F2203/006
Inventor 吴劲松董元琳
Owner 南通博恒环保科技有限公司
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