Novel active sludge process with reduced excess sludge

A technology of activated sludge and excess sludge, applied in water/sludge/sewage treatment, aerobic process treatment, chemical instruments and methods, etc. High operating costs and other issues, to achieve the effect of convenient management, low pollution, and low operating costs

Inactive Publication Date: 2006-07-19
NINGBO UNIVERSITY OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aerobic sludge staying in anoxic state for 11-12 hours will surely promote the lysis of biological cells in the sludge and become organic substances that can be used by organisms. If the sludge organic matter after cell lysis has returned to the aeration tank In the process, the organic load of the aeration tank will be increased, which will affect the operation performance of the whole process
In addition, considering the actual production process, the longer the sludge stays in the anoxic tank, the larger the volume of the anoxic tank, and the higher the investment and operating costs. Therefore, it is difficult for the sludge to stay for 11-12 hours in practice. of

Method used

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  • Novel active sludge process with reduced excess sludge
  • Novel active sludge process with reduced excess sludge

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Embodiment 1: the activated sludge process that this test adopts is the fully mixed activated sludge process of laboratory scale, and the effective volume of aeration tank is 12.5L, and the effective volume of settling tank is 2.2L (see attachment figure 1 ). There are 2 sets of test devices in total. Both devices are inoculated with 10 grams of activated sludge from the secondary settling tank of Ningbo Wastewater Treatment Plant, and input domestic sewage of the same water quality (COD is 600mg / L, BOD 5The total nitrogen concentration is 260mg / L, the total nitrogen concentration is 80mg / L, and the ammonia nitrogen concentration is 40mg / L), and the total amount of domestic sewage treated daily is 36 liters. The aeration tank is continuously aerated, the mud-water mixture in the aeration tank enters the sedimentation tank, and all the sludge in the sedimentation tank flows back into the aeration tank, so that the sludge concentration (MLSS) in the aeration tank gradual...

Embodiment 2

[0031] Embodiment 2: Different from Example 1, in the new process device of activated sludge, TCS 30mg is added to the aeration tank every day (the concentration in the aeration tank is 2.4mg / L), and the return sludge is in anoxic state. Pool stay 5.6 hours. The sludge yield of the activated sludge new process of this embodiment can be reduced by 39% compared with the traditional activated sludge process device, and the output water quality of the two sets of devices is almost the same, all reaching the discharge standard stipulated by the state, and the settling performance of the sludge is comparable to that of the control The traditional process is the same (SVI values ​​are all less than 100), and the TCS in the effluent is checked by high performance liquid chromatography, and it is found to be zero.

Embodiment 3

[0032] Embodiment 3: Different from Example 1, in the new process device of activated sludge, TCS 40mg is added to the aeration tank every day (the concentration in the aeration tank is 3.2mg / L), and the returning sludge is in anoxic state. Pool stay 5.6 hours. The sludge yield of the activated sludge new process of this embodiment can be reduced by 42% compared with the traditional activated sludge process device, and the output water quality of the two sets of devices is almost the same, all reaching the discharge standard stipulated by the state, and the settling performance of the sludge is comparable to that of the control The traditional process is the same (SVI values ​​are all less than 100), and the TCS in the effluent is checked by high performance liquid chromatography, and it is found to be zero (see Table 2).

[0033] Sludge yield

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Abstract

The activated sludge new technique for reducing residual sludge comprises: adding the sludge and sewage into aeration pond for continual aerating; depositing in deposition pond, and reflowing the sludge to aeration pond; when the sludge concentration over given value, reflowing part sludge to aeration pond and discharging other out; putting decouple agent into the aeration pond as sludge ratio, then aerating with sewage, and leading the decoupled mixed liquid into deposition pond; taking anoxybiotic treatment to some sludge in storage container for 4~6h and reflowing to aeration pond for aeration and decoupling with sewage. This invention can reduce 40-50% residual sludge with small investment and simple device.

Description

technical field [0001] The invention relates to a sewage biological treatment technology, in particular to a process for reducing excess sludge during sewage treatment. Background technique [0002] Activated sludge method is currently the most widely used sewage biological treatment technology in the world, but it has always had one of the biggest drawbacks, that is, it will produce a large amount of excess sludge. With the increasing amount of sewage and the continuous improvement of sewage treatment rate, my country's sludge production will increase significantly in the next few years. Although the sludge volume only accounts for 1-2% of the sewage volume, the investment in sludge treatment facilities accounts for about 40-50% of the total investment in the entire sewage treatment plant, and the sludge treatment and disposal costs generally account for 30% of the total operating costs. ~60%. Sludge disposal has developed from being just a unit of sewage treatment in the...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/02C02F3/12
CPCY02W10/10
Inventor 叶芬霞李颖刘新文
Owner NINGBO UNIVERSITY OF TECHNOLOGY
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