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A semi-short-path nitrification reactor for kitchen anaerobic wastewater and a method for starting the semi-short-path nitrification

A technology for semi-short-range nitrification and kitchen wastewater, applied in chemical instruments and methods, aerobic and anaerobic process treatment, water treatment parameter control, etc. Stable, saving carbon and energy, the effect of high nitrosation rate

Active Publication Date: 2020-02-14
JIANGNAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a semi-short-cut nitrification process start-up method for kitchen anaerobic wastewater, to provide suitable water inflow for the anaerobic ammonium oxidation process, and to solve the problem of low TN removal rate of kitchen anaerobic wastewater

Method used

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  • A semi-short-path nitrification reactor for kitchen anaerobic wastewater and a method for starting the semi-short-path nitrification
  • A semi-short-path nitrification reactor for kitchen anaerobic wastewater and a method for starting the semi-short-path nitrification
  • A semi-short-path nitrification reactor for kitchen anaerobic wastewater and a method for starting the semi-short-path nitrification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] The semi-short-range nitrification reactor is a stainless steel cylindrical structure, design parameters: bottom diameter (φ) × height (H) = 30cm × 30 cm, effective volume is 15L, and the side wall at the bottom of the reactor is equipped with an air inlet. The port is connected to the air pump 1 through a pipeline, and the other end of the air pump 1 is connected to the PLC control system 9; a gas flow meter 2 is set between the air inlet and the air pump 1; an aeration device 3 is set at the bottom of the reactor, and the air is supplied by the air pump 1 The gas flow meter 2 reaches the aeration device 3 installed at the bottom of the reactor, and the air pump 1 is used for aeration during the aeration period to provide dissolved oxygen for the inside of the system. The aeration device 3 is composed of 16 microporous aeration heads, which are evenly distributed from the central position of the reactor bottom to the surroundings through the ventilation pipe, and each a...

Embodiment 2

[0037] Inoculate the sludge into the semi-short-path nitrification reactor, and the inoculated sludge comes from the kitchen wastewater treatment plant A 3 / O 3 The aerobic tank sludge in the process, the sludge concentration is 6g / L, the inoculated sludge is strongly aerated in the reactor for 1d, the DO is controlled at 6-8mg / L, and the temperature is controlled at 30±1°C, so that the sludge has Full nitrification capacity.

[0038] The SBR operation mode is adopted, and the operation cycle includes water inflow for 10 minutes, continuous stirring and aeration for 8 hours, static precipitation for 2 hours, and drainage for 10 minutes. Run two cycles per day, each with 5L of water inflow and discharge. At the beginning of the cycle, 5L of influent water enters the reactor through a peristaltic pump, and at the same time, a precision stirring device is started to fully mix the mud and water. After the water inflow stage is completed, the air pump is turned on to aerate the r...

Embodiment 3

[0043] The specific implementation method is the same as in Example 2, the difference is that different DO concentrations are controlled, and the influence of DO concentration on the reaction system is studied, and stable NO is successfully achieved in the SBR process. 2 - After -N accumulation, the DO concentration in the system was changed to investigate the effect of different DO concentrations on the operating efficiency of the nitrosation system. At this stage, the average concentration of COD in the water is 1874mg / L, NH 4 + -N, NO 2 - -N, NO 3 - - The average value of N is 1231mg / L, 2mg / L and 29mg / L, and 6 different DO concentration stages are set.

[0044] When the DO concentration is lower than 0.5mg / L, the COD removal rate of the system is low, the subdigestibility is low, and the molar ratio of nitrite nitrogen to ammonia nitrogen in the effluent is 1:2 to 1:4; the aeration time increases, and the same amount of NH is oxidized 4 + The -N rate is slower and t...

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Abstract

A half shortcut nitration starting method for kitchen anaerobic wastewater. On the basis of the characteristics of wastewater, such as high ammonia nitrogen and low C / N ratio, by using a shortcut nitration reactor and utilizing the difference between AOB and NOB oxygen saturation constants, AOB is enriched by limiting the concentration of DO in the reactor, and at the same time, other conditions such as temperature and alkalinity are controlled to accumulate nitrite, so as to start the half shortcut nitration process quickly; and the effluent can meet the inflow requirements of a subsequence anaerobic ammoxidation process. Also disclosed is a half shortcut nitration reactor.

Description

technical field [0001] The invention relates to a semi-short-range nitrification start-up method for kitchen anaerobic wastewater, which belongs to the field of kitchen sewage treatment. Background technique [0002] With the rapid growth of the economy and the acceleration of the urban process, the generation of urban kitchen waste continues to grow, and the resulting pollution to the environment is also becoming more and more serious. The reduction, harmless and resourceful disposal of kitchen waste has become an important issue. current research hotspot. Kitchen waste is the main component of municipal solid waste, accounting for about 37% to 62% of municipal solid waste. According to statistics from the Institute of Solid Waste Pollution Control and Recycling of Tsinghua University, cities in my country generate more than 60 million tons of kitchen waste every year. Food waste is mainly composed of starch, food cellulose, animal fat and other organic substances. [00...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F3/30
CPCC02F3/12C02F3/303C02F2209/005C02F2209/02C02F2209/06C02F2209/08C02F2209/38Y02W10/10
Inventor 张周阮文权赵明星缪恒锋
Owner JIANGNAN UNIV
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