Sludge reduction method of urban wastewater treatment process

A treatment process and technology for urban sewage, applied in water/sewage multi-stage treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. It can achieve the effect that the water quality of sewage treatment remains unchanged, the cost of infrastructure renovation is low, and the operating cost is low.

Inactive Publication Date: 2010-07-07
SUN YAT SEN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] At present, several technical means commonly used to achieve sludge reduction are: physical and chemical sludge reduction method and biological predation sludge reduction method, and the high cost of physical and chemical sludge reduction method is not conducive to the development of urban sewage treatment plants in my country. Actual situation: Although the biological predation sludge reduction method has the characteristics of obvious sludge reduction effect, less infrastructure investment, low operating cost and no secondary pollution, it is difficult to control in engineering applications, and even has some influence on the quality of effluent water. Risk of making it worse, detrimental to the normal operation of the actual sewage treatment plant
[0007] At present, there is no technically reliable and economically feasible sludge reduction technology for the AB method of urban sewage treatment at home and abroad.

Method used

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  • Sludge reduction method of urban wastewater treatment process
  • Sludge reduction method of urban wastewater treatment process
  • Sludge reduction method of urban wastewater treatment process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0041] Example 1 Effect of sludge reduction method on COD of influent and effluent of AB process

[0042] This example studies and analyzes the COD (chemical oxygen demand) value of the influent and effluent water of the AB process with time before and after sludge reduction.

[0043] The influent COD basically keeps fluctuating within the range of 200-400mg / L, and the existing AB process is adopted in the first 0-60 days (the process is as follows figure 1 shown), and then partially transform the existing AB process, according to figure 2As shown in the process flow chart, the sludge thickening tank of the sludge treatment plant is installed in the pipeline of the existing AB process. The parameters of the sludge thickening tank are controlled as follows: return sludge residence time: 24h, stirring rate: 120sec / hour, Sludge exchange rate: 50% (mass), after 60-160 days of sewage treatment testing, the results are as follows image 3 shown.

[0044] The biggest feature of t...

Embodiment 2

[0046] Example 2 Sludge reduction method for AB process influent NH 4 - Effect of N value

[0047] In this example, the influent and effluent NH of the AB process before and after sludge reduction 4 -N value changes over time for research and analysis.

[0048] The first 0-60 days adopt the existing AB process (the process is as follows figure 1 shown), and then partially transform the existing AB process, according to figure 2 As shown in the process flow chart, the sludge thickening tank of the sludge treatment plant is installed in the pipeline of the existing AB process. The parameters of the sludge thickening tank are controlled as follows: return sludge residence time: 24h, stirring rate: 120sec / hour, Sludge exchange rate: 50% (mass), after 60-160 days of sewage treatment testing, the results are as follows Figure 4 shown.

[0049] Due to the short residence time of the sewage in the A-level, the ammonia nitrogen has not been degraded, and a part of the organic ni...

Embodiment 3

[0052] Example 3 Effect of sludge reduction method on SS value of influent and effluent of AB process

[0053] This example studies and analyzes the SS (suspended solids) value of the influent and effluent of the AB process over time before and after sludge reduction.

[0054] The first 0-60 days adopt the existing AB process (the process is as follows figure 1 shown), and then partially transform the existing AB process, according to figure 2 As shown in the process flow chart, the sludge thickening tank of the sludge treatment plant is installed in the pipeline of the existing AB process. The parameters of the sludge thickening tank are controlled as follows: return sludge residence time: 24h, stirring rate: 120sec / hour, Sludge exchange rate: 50% (mass), after 60-160 days of sewage treatment testing, the results are as follows Figure 5 shown.

[0055] The influent SS fluctuates greatly, but it is relatively stable after A-level treatment, basically stable at 70mg / L. Th...

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Abstract

The invention discloses a sludge reduction method of the urban wastewater treatment process. The method comprises the following steps: introducing a sludge concentration anaerobic starvation pond in the existing AB method urban sewage treatment process so that the original return sludge can enter the sludge concentration anaerobic starvation pond, and controlling the parameters of the sludge concentration anaerobic starvation pond to ensure that the residence time of the return sludge is 12-24 hours, the stirring rate is 30-300 seconds per hour and the total sludge amount in the sludge concentration anaerobic starvation pond accounts for 30%-60% of the total sludge weight in the entire AB technological system, thus the sludge reduction of the AB method urban sewage treatment process can be realized. On the basis that the invention does not change the operational parameters of the AB method urban sewage treatment plant in normal operation, the excess sludge production is reduced by over 35% compared with that of the original AB method so that the source reduction of sludge is realized, and the sewage treatment water quality and the sewage treatment cost are not changed.

Description

technical field [0001] The invention relates to an urban sewage treatment process, in particular to an AB method urban sewage treatment process, in particular to a sludge reduction method of the AB method urban sewage treatment process. Background technique [0002] AB process is the abbreviation of Adsorption--Biodegradation process. It is a process developed by Professor B.Bohnke of Yashen University in Germany in the mid-1970s. It belongs to the ultra-high load activated sludge process. The process does not have a primary sedimentation tank, and consists of a series of secondary activated sludge systems in the A section and the B section, and each has an independent sludge return system. Sewage enters section A directly from the urban drainage pipe network through the grid and grit chamber, and the residence time of the high-load section (section A) is about 20 to 40 minutes. It is a short-generation bacterial community, which can remove BOD by more than 50%. The B stage...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/12
CPCY02W10/10
Inventor 李适宇陈光浩刘广立伍珂王军
Owner SUN YAT SEN UNIV
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