Method for rapidly starting normal-temperature short-cut nitrification of municipal sewage by 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, easy to produce adaptability, expensive hydroxylamine, etc. problem, to achieve a highly operable effect

Active Publication Date: 2020-03-27
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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  • Method for rapidly starting normal-temperature short-cut nitrification of municipal sewage by benzethonium chloride
  • Method for rapidly starting normal-temperature short-cut nitrification of municipal sewage by benzethonium chloride
  • Method for rapidly starting normal-temperature short-cut nitrification of municipal sewage by benzethonium chloride

Examples

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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 inflow water at normal temperature, The reactor is aerated with the aeration pump, th...

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 operates 4 cycles per 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 by the aeration pump. 6.0±0.8mg / L; pH 7.8±0.2.

[0043] The first 30 cycles of the aerobic granular sludge reactor are the whole nitrific...

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Abstract

The invention discloses a method for rapidly starting normal-temperature short-cut nitrification of municipal sewage by benzethonium chloride, and belongs to the technical field of biological sewage treatment; through primary soaking treatment on activated sludge through benzethonium chloride, AOB and NOB are inhibited to a certain extent, but the activity of the AOB can be preferentially recovered, ammonia nitrogen is not converted into nitrate nitrogen any more after ammonia nitrogen is converted into nitrite nitrogen, and short-cut nitrification is successfully realized. The method comprises the steps: inoculating activated sludge subjected to whole-course nitrification into a sequencing batch biochemical reactor, and carrying out benzethonium chloride soaking treatment on the activatedsludge after aeration is finished, wherein the benzethonium chloride concentration is 50-80 mg/L, and the soaking time is 12-24 h. The activated sludge is only soaked once, the reactor returns to normal operation, and when the nitrite accumulation rate (NAR) reaches 90% or above, normal-temperature short-cut nitrification of the municipal sewage is formally started. Short-cut nitrification is realized by a new inhibitor, and the inhibitor can quickly start normal-temperature short-cut nitrification of the municipal sewage.

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 Applications(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
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