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A method for starting and controlling multistage partial nitrosation
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A control method and nitrosation technology, applied in chemical instruments and methods, water treatment parameter control, water/sludge/sewage treatment, etc. operation and other problems, to achieve the effects of low energy consumption for aeration and fluidization, high oxygen utilization rate, and adjustable volume load
Active Publication Date: 2020-05-19
苏州诺津环保科技有限公司
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[0031] In order to solve the problems in the prior art that the nitrosation process is difficult to run continuously, the ratio of effluent nitrogen is unstable, the long-term operation is easy to convert to the whole process of nitrification, and the sludge concentration is difficult to maintain, etc., the present invention proposes a multi-stage partial nitrosation start-up And control method, adopting this multi-stage partial nitrosation start-up and control method has the advantages of continuous operation, stable treatment effect, long-term operation stability, precise control of effluent nitrogen ratio, convenient management and maintenance, etc.
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[0059] In order to make the purpose, technical solution and advantages of the present invention clearer and clearer, the present invention will be further described in detail below in conjunction with specific embodiments.
[0060] Under the condition of continuous flow, the present invention adopts the suspended filler as the microorganism attachment carrier, which is different from the activated sludge method, and the microorganism is in a fixed state, which is more conducive to the retention of AOB (ammonia oxidizing bacteria); meanwhile, it is compatible with the fixed bed biofilm reactor The difference is that the carrier is fluidized, and the renewal of the biofilm is realized during the fluidized process. Through the control of the air-water ratio, the accumulation of NOB (nitrite oxidizing bacteria) in the mud age is prevented; at the same time, the intermittent aeration method is used to enrich the AOB. Set and NOB exclusion to create more favorable conditions. Low te...
Embodiment 1
[0062] The reactor pool capacity is 10m 3 , using a specific surface area of 700m 2 / m 3 Suspended carrier, the specific gravity of the suspended carrier before film formation is 0.965, and the porosity is >95%; the reactor is divided into 8 stages, and the reactors at each stage have the same pool capacity and the same filling rate, and no sludge return is set. The concentration of suspended sludge is always <0.5g / L; the influent is decarbonized domestic sewage, the influent BOD is 10±3mg / L, TN is 55±6mg / L, ammonia nitrogen is 50±5mg / L, BOD : TN<0.2, influent SS<20mg / L, water temperature is 14±2℃;
[0063] 1) Start nitrification, fill suspension carrier 4m 3 , the filling rate is 40%, the DO is controlled at 4-5mg / L, and the activated sludge of the sewage plant is inoculated with 4g / L. Sludge, start continuous water inflow and aeration, initial HRT=10h, DO control at 4-5mg / L, by 15d, ammonia oxidation rate is 72%, ammonia nitrogen removal surface load is 0.306gN / (m 2 d...
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Abstract
The invention discloses a startup and control method for multistage partial nitrification and belongs to the field of sewage treatment. According to the startup and control method, the problems of lowpossibility of starting, an unstable accumulation effect of nitrite and the like in a traditional nitrification process are solved. The method disclosed by the invention comprises the steps of nitrification startup, intermittent aeration startup, regulation of nitrite accumulation rate, regulation of ammonia oxidation rate, stable operation control over nitrite and the like; finally, the ammonianitrogen oxidation rate is stabilized at 55 to 60 percent, the nitrite accumulation rate is stabilized to be greater than or equal to 92 percent, the ammonia nitrogen removal surface load is greater than or equal to 0.60gN / (m2.d), and the requirements of subsequent anaerobic ammonia oxidation on nitrogen element are met. The startup and control method disclosed by the invention has the advantagesof stable partial nitrification effect, high load of ammonia nitrogen oxidation, reduced occupied area, simple operation and reliable operation; compared with a traditional process, the startup and control method has the characteristics that selection and elimination of microorganisms can be realized and the long-term operating instability is prevented; the utilization rate of oxygen is high and energy consumption of aeration fluidization is low.
Description
technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for starting and controlling multistage partial nitrosation. Background technique [0002] Anaerobic Ammonium Oxidation (ANAMMOX for short), based on NO 2 - -N is electron acceptor, CO 2 As an inorganic carbon source, under anaerobic conditions, the NH 4 + -N oxidation to N 2 biological process. Compared with the traditional nitrification-denitrification process, the ANAMMOX process has the advantages of saving 50% of the aeration rate and 100% of the organic carbon source, so once discovered, it has aroused the interest of many researchers. [0003] Since the anaerobic ammonium oxidation process requires ammonia nitrogen and nitrite nitrogen with a ratio of 1:1.31 as a substrate, a pretreatment process is required to partially oxidize ammonia nitrogen to nitrite nitrogen without generating nitrate nitrogen, that is, partial nitrosation process, also kn...
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