Process control device of CAST step-feed and further denitrification and method
A technology of deep denitrification and staged water inflow, applied in aerobic and anaerobic process treatment, etc., can solve problems such as operation mode is not optimal, excessive aeration reaction time, influence of nitrogen removal efficiency, etc., to save external investment. Carbon source amount, good denitrification effect, and the effect of solving the improvement of operating cost
Active Publication Date: 2008-11-19
JIANGSU YULONG ENVIRONMENTAL PROTECTION
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Problems solved by technology
However, the quality of raw water fluctuates and is not fixed. Obviously, this fixed operation mode is not an optimized way.
For example, when the concentration of pollutants in the influent water is higher than the average concentration, if the water inflow time of 2 hours remains unchanged and the aeration rate remains unchanged, then the aeration reaction time of 2 hours is insufficient; When the concentration of pollutants in the water is reduced, the aeration reaction time of 2 hours is too much and wasted
Moreover, although the aeration reaction time of 2 hours may meet the needs of nitrification reaction, the removal efficiency of total nitrogen will be affected due to insufficient anoxic denitrification time
Method used
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[0053] The actual domestic sewage discharged from a family area of a certain university was used as the experimental object (pH=6.5~7.8, COD=260~350mg / L, TN=60~85mg / L). The selected CAST reactor has an effective volume of 18L, the initial MLSS in the reactor is 3.5-4.0g / L, and the aeration rate is constant at 0.1m 3 / h, the mud age is maintained at about 15d, and the reaction temperature is 23°C. Using the CAST segmented influent deep denitrification process and process control device, the treated water volume is 8L, and the number of segments is 2 times. The COD in the final effluent water is less than 50mg / L, and the total nitrogen is less than 5mg / L, which is far lower than the national first-level discharge standard. total nitrogen concentration.
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The invention relates to a process control device and a process control method for CAST step-feed advanced nitrogen removal, belonging to the SBR and modified process sewage biological nitrogen removal technical field. The method adopts an integration of an operating mode of feeding for many times and a real-time control system, fully utilizes an organic carbon source in original sewage, saves externally-added carbon source amount to the utmost extent, scientifically and reasonably distributes nitrification and denitrification time of each stage at the same time, adds an anoxic mixing phase, adopts a long various time aerobic / anoxic mode to operate, and uses a real-time process control strategy to realize the time control of aerobic aeration and anoxic mixing. The method can improve treatment efficiency, reduce running cost, and ensure that the anti-shock loading capability of the whole system is greatly improved due to the fact that the on-line real-time process control is adopted and can still accurately control alternative aerobic / anoxic time when the concentration of influent pollutants is greatly changed.
Description
technical field [0001] The invention relates to a process control device and a method for CAST (circulating activated sludge method) segmented influent deep denitrification, which is suitable for nitrogen-containing industrial wastewater treatment and urban sewage advanced treatment, and belongs to SBR (sequenced batch activated sludge method) and its The technical field of biological denitrification of modified process sewage. Background technique [0002] The problem of eutrophication is one of the most important water pollution problems faced by countries all over the world. Although the treatment rate of urban sewage in my country has been continuously improved in recent years, the problem of eutrophication caused by nitrogen and phosphorus pollution has not been fundamentally solved. There is even a growing trend. my country's large freshwater lakes and coastal waters are moderately or severely polluted with eutrophication. In the newly promulgated "Pollutant Discharge...
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Inventor 彭永臻马娟王丽王淑莹甘一萍常江
Owner JIANGSU YULONG ENVIRONMENTAL PROTECTION
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