Sewage treatment method for coping with industrial wastewater impact in municipal wastewater plant

A sewage treatment method and technology for industrial wastewater, applied in biological water/sewage treatment, water/sludge/sewage treatment, aerobic and anaerobic process treatment, etc. Reduced capacity, no mention of system recovery, etc., to achieve the effect of reducing system load and toxic effects, achieving rapid proliferation, restoring activity and processing capacity

Active Publication Date: 2014-11-19
JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The problem with the above-mentioned technical solution is that if the domesticated system is impacted by refractory pollutants, the normal growth and reproduction of microorganisms cannot be guaranteed, and the treatment capacity of activated sludge will drop rapidly or even be lost (no short-term recovery without human intervention)
The second is that the two elements gallium and indium mentioned in the technical solution are mutagenic and irritating, and they are dangerous and toxic after being added to the water plant and discharged into the environment, so they are not suitable for practical application
The third is that the above-mentioned technical scheme is a solution proposed for the domestication and cultivation of anaerobic microorganisms. Judging from the comparative effects of the examples, it is superior to the traditional or existing anaerobic microorganism treatment in terms of domestication time and COD removal rate , but it does not mention whether the system can recover after being subjected to shock load, the recovery time and the effect
Fourth, the comparative literature is mainly aimed at the nutrient enhancer of anaerobic microorganisms (which can be widely used in the treatment of high-concentration organic wastewater, see the paragraph [0014] on page 4 of the comparative literature instruction manual), and the anaerobic microorganisms and anoxic / aerobic microorganisms. Therefore, the nutrient enhancer applied to anaerobic microorganisms is not suitable for anoxic / aerobic tanks of municipal sewage treatment plants
(In the biological treatment process of municipal sewage treatment plants, the anoxic / aerobic process is the main one, and there are also a small amount of anaerobic ponds, but the anaerobic ponds of municipal sewage treatment plants are used for biological phosphorus removal, and the influent COD is low. The concentration of organic matter is low, and the types of microorganisms are very different from the anaerobic ones in high-concentration organic wastewater in the comparative literature

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] The COD of the influent water of an urban sewage plant is 200mg / L, the water volume is 10,000 tons / d, the hydraulic retention time is 10 hours, and the normal working load of the influent water of the biochemical tank is 0.48kg / m 3 ·d, the sludge age is 10d, and the effluent COD is 30mg / L, meeting the national first-class A discharge standard. For a certain period of time, the influent of a certain industrial wastewater into the plant is all refractory organic matter. After the industrial wastewater enters, the COD load of the influent in the biochemical tank increases to 1.20kg / m2 3 d, increased by 150%, the COD of the influent is 500mg / L, and the COD of the effluent is increased from 30mg / L to 260mg / L, which does not meet the national level A emission standard. The following methods were used for treatment: 1. Add 80 mg / L of carbon source (24, 32, and 24 mg / L of glucose, starch, and methanol, respectively), to extend the sludge age to 18 days, which was extended by 80...

Embodiment 2

[0042] The difference between this example and Example 1 is that when the COD load of the biochemical pool influent is increased by 5% (to 0.504CODkg / m 3 ·d), the COD of the influent is 210mg / L, and the COD of the effluent rises to 62mg / L. Adjust as follows: add carbon source 6mg / L (according to the ratio of glucose:starch:methanol=3:4:3), the sludge age is extended to 11d, which is extended by 10%; in the anoxic tank of the biochemical tank / or The carbon source that accounts for 30%-50% of the total mass of the added carbon source is put into the anoxic section; the balance of the added carbon source is put into the aerobic pool / or aerobic section of the biochemical pool. After applying the above method, the effluent decreased from 62mg / L to 36mg / L within 3 days, and the removal rate was 83%, reaching the national first-class A discharge standard.

Embodiment 3

[0044] The difference between this example and Example 1 is that when the COD load of the biochemical pool influent is increased by 10% (to 0.528kgCOD / m 3 ·d), the COD of the influent is 220mg / L, and the COD of the effluent rises to 85mg / L. Adjust as follows: add 10mg / L of carbon source (according to the ratio of glucose:starch:methanol=2:4:4), the sludge age is extended to 11.5d, an increase of 15%; Or the carbon source that accounts for 30%-50% of the total mass of the added carbon source is put into the anoxic section, and the balance of the added carbon source is added to the aerobic pool / aerobic section of the biochemical pool; The dosage of aluminum is 30mg / L, and the dosage method is to add 30%-50% of the total mass added in the anoxic tank / or anoxic section of the biochemical tank, and the remainder is added to the aerobic tank of the biochemical tank. In the tank / or aerobic section; 15% of the total mass of the effluent of the biochemical tank will be returned to the...

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Abstract

The invention belongs to sewage treatment and especially relates to a sewage treatment method for coping with industrial wastewater impact in a municipal wastewater plant. When degradation-resistant industrial wastewater flows into the municipal wastewater plant and causes impact on the municipal wastewater plant, according to difference of a value of a COD load of an inlet water exceeding a normal work load, a carbon source, which is composed of glucose, starch and methanol in different masses, is added to a biochemical tank correspondingly with a sludge age being adjusted correspondingly. The method can solve problems of a long recovering time after sludge being impacted and a poor degradation effect on COD in the prior art, and has advantages of being short in recovering time of a sludge system, being good in degradation effect on COD and being stable in microbial communities required in sewage treatment.

Description

technical field [0001] The invention belongs to the treatment of sewage, in particular to a sewage treatment method for urban sewage plants to cope with the impact of industrial wastewater. Background technique [0002] Activated sludge method is the main method for wastewater treatment in urban sewage treatment plants at present. Activated sludge is a sludge-like flocculation formed by the reproduction of microorganisms. Under the catalysis of enzymes, microorganisms use organic matter and oxygen in sewage to convert organic matter. It is oxidized into water and carbon dioxide to achieve the purpose of removing organic pollutants in water. The water quality of the influent should be stable and avoid fluctuations, otherwise the normal life activities of microorganisms will be inhibited, resulting in microbial attenuation, death and other phenomena, which will affect the treatment effect. [0003] At present, most municipal sewage treatment plants contain some industrial was...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/34C02F3/30
Inventor 栗勇田冉慧英王晓磊赵一宁安少锋王伟燕
Owner JIACHENG ENVIRONMENTAL PROTECTION ENG CO LTD
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