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A Source Sludge Reduction Process of Return Sludge Alkali Treatment-Acidification

A technology of backflow sludge and alkali treatment, applied in sludge treatment, biological sludge treatment, water/sludge/sewage treatment, etc. low consumption effect

Inactive Publication Date: 2016-01-20
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although there are many studies on these technologies, so far, these sludge reduction technologies have not been widely used in practical projects due to economic or technical problems.

Method used

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  • A Source Sludge Reduction Process of Return Sludge Alkali Treatment-Acidification

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Using domestic sewage from a community, the raw water quality is as follows: COD150-450mg / L, NH4 + -N25-55mg / L, TN28-62mg / L, TP4-12mg / L, pH6.8-7.7. The hydraulic retention time of anaerobic pond, anoxic pond and aerobic pond are 2h, 2h and 8h respectively, and the dissolved oxygen is 0.1-0.2mg / L, 0.4-0.5mg / L and 1.5-2.5mg / L respectively, The sludge concentration in the aerobic tank is maintained at 2.5-3.5g / L, the internal reflux ratio is 200%, and the room temperature is 18-26°C. Under the same test conditions, two sets of systems were operated, one of which added sludge alkali treatment-acidification process (test system) in the sludge return section, the ratio of direct return sludge to alkali-treated sludge was 1:4, and the sludge The reflux ratio of mud is 100%; while another set does not increase the process (control system), the reflux ratio of sludge is also 100%. In the test system, 10M NaOH is used for the lye, the flow rate ratio of the lye and the concentr...

Embodiment 2

[0021] The test conditions are the same as in Example 1. The lye is 10MNaOH. In the test system, the flow rate ratio of lye and concentrated sludge is selected as 1:2000. The pH of the sludge entering the acidification tank is about 11.0. The residence time of the sludge in the acidification tank is 12h. The pH reaches 9. The test ran normally for 2 months. The test results show that compared with the control system, the average COD of the effluent of the test system is 41mg / L, which is 3.5mg / L higher than that of the control system, and the NH 4 + The removal rate of -N and TN was 2-5% lower than that of the control system, while the removal rate of TP was 40% lower, and the reduction of residual sludge was about 54%.

Embodiment 3

[0023] The test conditions are the same as in Example 1. The experimental conditions were the same as in Example 1. The lye is 10M NaOH, the ratio of the flow rate of lye and concentrated sludge in the test system is selected as 1:4000, the pH of the sludge entering the acidification tank is about 11.0, the residence time of the sludge in the acidification tank is 10h, and the final pH of the sludge value reaches 7. The test ran normally for 2 months. The test results show that compared with the control system, the average COD of the effluent of the test system is 39mg / L, which is 2mg / L higher than that of the control system, and the NH 4 + The removal rate of -N and TN was 1-2% lower than that of the control system, while the removal rate of TP was 25% lower, and the reduction of residual sludge was about 25%.

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Abstract

The invention discloses a fountainhead sludge reduction process of backflow sludge alkali treatment acidifying, and belongs to the field of sewage treatment technology. The process is composed of a sewage biological treatment and a sludge alkali treatment-anaerobic acidifying backflow, and the sewage can reach the standard for discharging in reality after the biological treatment portion, thereby one part of the generated sludge in the treatment process can direct flow back, and one part can be used as residual sludge for discharging, and the other part can be mixed with an alkali liquor and treated by a alkali treatment after passing through a condensation pool, and then is treated by anaerobic acidifying and flow back to the sewage biological treatment process. Compared with the sludge backflow segment of the traditional A2O sewage treatment process, the alkali treatment-acidifying process is added, and combined with the sludge alkali treatment and the anaerobic technology, the synergism of the alkali treatment and the anaerobic acidifying reduces the residual sludge output in the sewage biological treatment process, thereby the sludge reduced 20-90%. The invention has the advantages of simple process, convenient operation, low operation cost, low energy consumption and substantial sludge treatment effect.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a source sludge reduction process of backflow sludge alkali treatment-acidification. Background technique [0002] Sludge is a by-product produced in the process of sewage biological treatment, and it is also an important organic waste at present. According to a survey of 29 urban sewage treatment plants across the country in 1996, the amount of sludge generated per 10,000 tons of wastewater treatment is 0.3-3.0 tons (dry weight). Since entering the "Eleventh Five-Year Plan", my country's sewage treatment industry has developed rapidly, and the sewage treatment capacity and treatment rate have increased rapidly, which has brought about a rapid increase in sludge production. According to the data of the Ministry of Housing and Urban-Rural Development, by the end of 2010, the national urban sewage treatment volume reached 34.3 billion cubic meters, and the out...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/30C02F11/12C02F11/00C02F11/04
Inventor 肖本益刘俊新李鹤超
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI