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Rapid starting method of shortcut nitrification and denitrification in A/O (Anoxic/Oxic) process

A short-range nitrification and quick-start technology, which is applied in the field of sewage treatment, can solve the problems of difficult denitrification and reduced denitrification efficiency, and achieve the effects of improving denitrification efficiency, preventing sludge bulking, and high treatment efficiency

Active Publication Date: 2015-05-13
浙江欧托电气有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] With the improvement of people's living standards, the phenomenon of low C / N ratio in urban domestic sewage is becoming more and more common, resulting in the difficulty of denitrification in the process of biological denitrification of sewage, and the reduction of denitrification efficiency.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] Select a sponge filler (1cm*1cm*1cm) with a large specific surface area, a density close to that of water, and not easy to clog, and place it in the aerobic tank. The filler and sludge are uniformly inoculated, and the filler dosage accounts for 10% of the reactor volume. The aerobic activated sludge of the urban sewage treatment plant was used as the inoculum, the MLSS after inoculation was 3g / L, the volume ratio of the aerobic tank and the anoxic tank was 1:1, and the sludge in the aerobic tank and the anoxic tank The inoculum volume was 30% of the effective volume of the corresponding reaction pool.

[0033] The artificially prepared synthetic wastewater is used as the influent, the influent COD / N ratio is 6, and the composition is as follows: (NH 4 ) 2 SO 4 283mg / L, NaHCO 3 720mg / L, K 2 HPO 4 70mg / L, MgSO 4 ·7H 2 O100mg / L, NaCl58.5mg / L, sodium acetate 463mg / L, trace elements 1mL / L. Trace element composition (g / L): ZnSO 4 ·7H 2 O0.43, H 3 BO 4 0.014, MnC1...

Embodiment 2

[0037] Select a sponge filler (1cm*1cm*1cm) with a large specific surface area, a density close to that of water, and not easy to clog, and place it in the aerobic tank. The filler and sludge are evenly inoculated, and the filler dosage accounts for 20% of the reactor volume. The aerobic activated sludge from the urban sewage treatment plant was used as the inoculum to inoculate the aerobic pool and the anoxic pool. The volume ratio of the aerobic pool and the anoxic pool was 1:1, and the MLSS of the inoculated sludge was 17g / L. The inoculum size is 30% of the effective volume of the bioreactor.

[0038] The artificially prepared synthetic wastewater is used as the influent, the influent COD / N ratio is 4, and the composition is as follows: (NH 4 ) 2 SO 4 236mg / L, NaHCO 3 600mg / L, K 2 HPO 4 70mg / L, MgSO 4 ·7H 2 O100mg / L, NaCl58.5mg / L, sodium acetate 257mg / L, trace elements 1mL / L. Trace element composition (g / L): ZnSO 4 ·7H 2 O0.43, H 3 BO 4 0.014, MnC1 2 4H 2 O0.9...

Embodiment 3

[0042] Select a sponge filler (1cm*1cm*1cm) with a large specific surface area, a density close to that of water, and not easy to clog, and place it in the aerobic tank. The filler and sludge are evenly inoculated, and the filler dosage accounts for 15% of the reactor volume. The aerobic activated sludge of the urban sewage treatment plant was used as the inoculum, the MLSS after inoculation was 5g / L, the volume ratio of the aerobic tank and the anoxic tank was 1:1, and the sludge in the aerobic tank and the anoxic tank The amount of inoculum is 40% of the effective volume of the corresponding reaction pool

[0043] With urban domestic sewage as the influent, the influent COD / N ratio is about 5.5. Influent water quality is as follows: TCOD341mg / L, ammonia nitrogen 44mg / L, TN62mg / L, SS80mg / L, TP7.2mg / L, pH7.3. Continuous water inlet operation, the hydraulic retention time of the anoxic pool and the aerobic pool are both set to 6h, the temperature is controlled at 28°C, and the...

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Abstract

The invention discloses a rapid starting method of shortcut nitrification and denitrification in an A / O (Anoxic / Oxic) process. The rapid starting method comprises the following steps of: (1) placing a suspended filler in an oxic tank; (2) respectively placing inoculated sludge in an anoxic tank and the oxic tank; (3) enabling wastewater to sequentially flow through the anoxic tank and the oxic tank in a continuous operation manner, wherein the ammonia nitrogen concentration of the wastewater is 25-60mg / L, the ratio of carbon to nitrogen is 2-8, and the proportion of nitrite in the oxic tank reaches above 70%, and the yielding water nitrogen removal efficiency is stabilized at 80%-90%, thus completing the starting process of the shortcut nitrification and denitrification. The rapid starting method has the advantages that the starting time of the shortcut nitrification and denitrification in the A / O process is short, the accumulation rate of the nitrite in the oxic tank reaches above 70%, the nitrogen removal efficiency of the whole process can reach above 90%, and the long-term stable operation of a reactor can be ensured.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a quick start-up method for short-range nitrification and denitrification in an A / O process. Background technique [0002] The discharge of nitrogen and phosphorus-containing wastewater is a major cause of water eutrophication. After the water supply crisis occurred in Wuxi City in the Taihu Lake Basin in 2007, the state put forward stricter water quality requirements for the tail water discharge of urban sewage treatment plants in the Taihu Lake Basin. my country's latest sewage discharge standard (GBl8918-2002) requires that the nitrogen and phosphorus content of the final effluent of all sewage discharge units is less than 0.5mg / L for total phosphorus, less than 5mg / L for ammonia nitrogen, and less than 15mg / L for total nitrogen according to the level of the receiving water body ( Level 1 A standard). It can be seen that no matter whether it is a new sewage plant or a...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30
Inventor 殷峻徐恒娟沈东升
Owner 浙江欧托电气有限公司
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