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A sewage treatment method for urban sewage plants to cope with the impact of industrial wastewater

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, unsuitable for practical applications, etc., to reduce system load and toxic effects, achieve rapid proliferation, restore activity and processing capacity

Active Publication Date: 2015-10-07
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 influent COD 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 biochemical tank is 0.48kg / m 3 d, the sludge age is 10 days, and the effluent COD is 30mg / L, meeting the national first-class A discharge standard. For a certain period of time, a certain kind of industrial wastewater entered the water of the plant, all of which were refractory organic matter. After the industrial wastewater entered, the COD load of the biochemical tank influent increased to 1.20kg / m 3 d, an increase of 150%, the influent COD is 500mg / L, and the effluent COD has increased from 30mg / L to 260mg / L, which has not reached the national first-class A discharge standard. Adopt following method to process: 1, add carbon source 80mg / L (wherein glucose, starch, methyl alcohol are respectively 24,32,24mg / L), prolong sludge age to 18d, prolong 80%; Add carbon sources accounting for 30%-50% of the total...

Embodiment 2

[0042] The difference between this embodiment and embodiment 1 is: when the COD load of the biochemical pond influent increases by 5% (0.504CODkg / m 3 When d), the influent COD is 210mg / L, and the effluent COD rises to 62mg / L. Adjust in the following way: 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 10% longer; in the anoxic pool of the biochemical pool / or The carbon source accounting 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 added to the aerobic pool / or the aerobic section of the biochemical pool. After applying the above method, the effluent was reduced 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 embodiment and embodiment 1 is: when the COD load of the biochemical pond influent increases by 10% (0.528kgCOD / m 3 When d), the influent COD is 220mg / L, and the effluent COD rises to 85mg / L. Adjust in the following way: add carbon source 10mg / L (according to the ratio of glucose:starch:methanol=2:4:4), the sludge age is extended to 11.5d, which is 15% longer; in the anoxic pool / Or put in the carbon source accounting for 30%-50% of the total mass of the added carbon source in the anoxic section, and add the balance of the added carbon source to the aerobic pool / aerobic section of the biochemical pool; polymer chlorination The dosage of aluminum is 30mg / L, and the dosage method is to put 30%-50% of the total mass in the anoxic pool / or anoxic section of the biochemical pool, and add the rest to the aerobic section of the biochemical pool. Pool / or in the aerobic section; return 15% of the total mass of the effluent from the biochemical pool to...

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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 sewage treatment, in particular to a sewage treatment method for urban sewage plants to deal with the impact of industrial waste water. Background technique [0002] Activated sludge method is currently the main method of wastewater treatment in urban sewage treatment plants. Activated sludge is a sludge-like floc formed by the propagation of microorganisms. Under the catalysis of enzymes, microorganisms use organic matter and oxygen in sewage to convert organic matter Oxidized to water and carbon dioxide to achieve the purpose of removing organic pollutants in water. The quality of the influent water should be stable and avoid fluctuations, otherwise the normal life activities of microorganisms will be inhibited, resulting in the attenuation and death of microorganisms, which will affect the treatment effect. [0003] At present, most municipal sewage treatment plants contain some industrial wastewater in the sewage, which le...

Claims

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Application Information

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Patent Type & Authority Patents(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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