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A method for quickly starting short-range nitrification of urban sewage at room temperature by using benzethonium chloride

A technology of benzethonium chloride and urban sewage, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve hidden dangers, expensive hydroxylamine, easy to produce adaptability, etc. problem, to achieve a highly operable effect

Active Publication Date: 2021-12-03
BEIJING UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

But there are many drawbacks in these inhibitors, as finding that NOB has adaptability to FA and FNA suppression; Hydroxylamine is expensive (about 14 yuan per gram of Hydroxylamine, 7 times the price of benzethonium chloride used in the present invention); Chlorate is a A highly sensitive explosive, if mixed with certain impurities, it will even explode under sunlight; azide is an explosive substance and poisonous, such as sodium azide is a highly toxic chemical
Generally speaking, these inhibitors have disadvantages such as easy adaptability of NOB, high price, and hidden dangers.

Method used

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  • A method for quickly starting short-range nitrification of urban sewage at room temperature by using benzethonium chloride
  • A method for quickly starting short-range nitrification of urban sewage at room temperature by using benzethonium chloride
  • A method for quickly starting short-range nitrification of urban sewage at room temperature by using benzethonium chloride

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] The implementation example of the present invention uses the activated sludge of a city sewage treatment plant in Beijing as the seed sludge and the supernatant of a septic tank in a family area in Beijing as the influent substrate. Activated sludge is the whole process of nitrification sludge, and the whole process of nitrification is as follows: figure 1 shown.

[0034] The actual domestic sewage water quality is: NH 4 + -N is 52.45±15.35mg / L, NO 2 - -N and NO 3 - -N were all below the detection limit, the total nitrogen (TN) was 56.26±15.14mg / L, and the COD was 210.13±50.67mg / L.

[0035] The sludge concentration in the biochemical reactor is about 3000mg / L; it operates 4 cycles a day, and each cycle is divided into four stages: water intake for 6 minutes, aeration for 240 minutes, drainage for 5 minutes, and idle time for 109 minutes; the actual domestic sewage is used as the inlet water for normal temperature operation, The reactor is aerated with the aeratio...

Embodiment 2

[0040] In this implementation example, aerobic granular sludge is used as the seed sludge, and the supernatant of a septic tank in a family area in Beijing is used as the influent substrate.

[0041] The actual domestic sewage water quality is: NH 4 + -N is 65.61±15.49mg / L, NO 2 - -N and NO 3 - -N were all below the detection limit, the total nitrogen (TN) was 67.27±15.33mg / L, and the COD was 198.46±50.14mg / L.

[0042] The aerobic granular sludge was inoculated into the sequencing batch biochemical reactor, and the sludge concentration was about 2800mg / L. It runs 4 cycles a day, and each cycle is divided into four stages: water intake for 5 minutes, aeration for 210 minutes, drainage for 1 minute, and idle time for 144 minutes; the actual domestic sewage is used as the inflow water at room temperature, and the reactor is aerated with the aeration pump, and the DO concentration 6.0±0.8mg / L; pH 7.8±0.2.

[0043] The first 30 cycles of the aerobic granular sludge reactor a...

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Abstract

The method of using benzethonium chloride to quickly start short-range nitrification of urban sewage at room temperature belongs to the technical field of sewage biological treatment. A soaking treatment of activated sludge by benzethonium chloride will inhibit AOB and NOB to a certain extent, but AOB will Prioritize the recovery of activity, ammonia nitrogen will no longer be converted to nitrate nitrogen after it is converted into nitrite nitrogen, and short-range nitrification is successfully realized. The method is: inoculate the whole process of nitrification activated sludge into the sequencing batch biochemical reactor, and after the aeration, soak the activated sludge with benzethonium chloride, the concentration of benzethonium chloride is 50-80mg / L, and the soaking time is 12‑24h. The activated sludge is only soaked once, and the reactor resumes normal operation. When the nitrite accumulation rate (NAR) reaches more than 90%, the short-range nitrification of urban sewage at room temperature is officially started. The invention utilizes a novel inhibitor to realize short-range nitrification, and the inhibitor can quickly start short-range nitrification of urban sewage at normal temperature.

Description

technical field [0001] The invention belongs to the technical field of sewage biological treatment and relates to a method for rapidly starting short-range nitrification of urban sewage at normal temperature. The invention is suitable for biological denitrification treatment of urban sewage with low carbon-to-nitrogen ratio. Background technique [0002] For urban sewage treatment, biological denitrification is an important treatment method. The traditional biological denitrification method is a stable way of denitrification, the process is: (1) aerobic nitrification, ammonia oxidizing bacteria (AOB) convert ammonia into nitrite; nitrite oxidizing bacteria (NOB) Nitrite is converted into nitrate; (2) Denitrification denitrification, denitrification bacteria use organic carbon as an electron donor to convert nitrate into nitrogen. However, the nitrification in the traditional biological denitrification process requires energy-intensive aeration; for urban sewage with low CO...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/12C02F101/16
CPCC02F3/1263C02F2101/16C02F2101/166Y02W10/10
Inventor 高景峰崔影超张达赵轶凡王雨薇
Owner BEIJING UNIV OF TECH