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Method and system for secondary nucleation and reuse of calcified anaerobic granular sludge

A technology of anaerobic granular sludge and secondary nucleation, applied in chemical instruments and methods, anaerobic digestion treatment, water/sludge/sewage treatment, etc. Achieve the effect of accelerating sludge granulation, avoiding potential pollution and easy control of conditions

Active Publication Date: 2021-10-01
SOUTH CHINA NORMAL UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, for completely or partially calcified anaerobic granular sludge, the conventional method is to discharge it from the bottom of the bioreactor, which is equivalent to the sludge for stacking or landfill, which not only takes up a lot of space, but also wraps the inside and surface of the calcified anaerobic granular sludge. Or adhered biological substances (proteins, polysaccharides and microbial cells, etc.) will often bring secondary potential environmental pollution and harm if not further processed

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  • Method and system for secondary nucleation and reuse of calcified anaerobic granular sludge
  • Method and system for secondary nucleation and reuse of calcified anaerobic granular sludge
  • Method and system for secondary nucleation and reuse of calcified anaerobic granular sludge

Examples

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Embodiment 1

[0036] Such as figure 1 Shown is a specific flowchart of a method for secondary nucleation and reuse of calcified anaerobic granular sludge, including:

[0037] (1) Collect the calcified anaerobic granular sludge in the bioreactor, and squeeze or crush it;

[0038] (2) Screening the broken calcified anaerobic granular sludge to obtain calcified anaerobic granular sludge debris with a particle size within a certain range;

[0039] (3) The debris obtained is mixed with bioreactor inflow and outflow water and normal sludge for a certain period of time;

[0040] (4) Return the mixed cultured sludge to the bioreactor to promote secondary nucleation and accelerate sludge granulation.

[0041] The components of a secondary nucleation and reuse system for calcified anaerobic granular sludge are as follows: figure 2 As shown, the system includes a crushing module, a screening module, a mixed cultivation module, and a sludge pumping and pumping module;

[0042] The crushing module ...

Embodiment 2

[0052] Others are the same as embodiment 1. In this example, the ratio of (influent: normal sludge: calcified granular sludge) was controlled to be 6:2:2 during mixed culture. Preferably, the stirring speed in the continuous stirred reactor (CSTR) is 20 rpm; the cultivation temperature is 30° C.; the bioreactor does not reflux, and the water inlet is replaced every 2 days. After about 40 days of operation, the following conditions are obtained: Similar to the granular sludge with higher biological activity after secondary nucleation in Example 1.

Embodiment 3

[0054] The method and system for secondary nucleation and reuse of calcified anaerobic granular sludge are the same as in Example 1. In this example, the granular sludge discharged from the bottom of the anaerobic tower of a citric acid processing enterprise was collected and crushed under the action of the rolling crushing module, and the rolling intensity was controlled so that the pressure on some calcified particles was approximately 30 N / cm2. The crushing time of the rolling crushing module is 10 minutes, and the wheel rolling speed is controlled at 5 rpm. During the crushing process, water is properly supplemented to keep the sludge particles and their debris moist.

[0055] After the particle debris passes through the screening module, the sludge particle debris with a particle size between 0.1 and 0.5mm is obtained. After collection, it is mixed with the reactor inlet and outlet water and normal sludge. Unloading valve, top have sample inlet, exhaust hole, there is cul...

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Abstract

The invention discloses a method for secondary nucleation and reuse of calcified anaerobic granular sludge, comprising: (1) collecting the calcified anaerobic granular sludge in a bioreactor, squeezing or crushing it; (2) The broken calcified anaerobic granular sludge is screened to obtain calcified anaerobic granular sludge debris within a certain range of particle size; (3) the obtained debris is mixed with the bioreactor inlet and outlet water and normal sludge for culture for a certain period of time; (4) return the mixed cultured sludge to the bioreactor to promote secondary nucleation and accelerate sludge granulation. The invention is easy to operate, has no special requirements on external conditions, helps to maintain high biomass and biological metabolic activity in the biological treatment system, improves process stability, and provides protection for avoiding external environmental pollution from calcified sludge and its adherent substances. It is a reference and has significant application value.

Description

technical field [0001] The invention relates to the field of wastewater biological treatment and reuse, in particular to a method and system for secondary nucleation and reuse of calcified anaerobic granular sludge. Background technique [0002] High-efficiency anaerobic biological treatment process and system have become a very attractive wastewater biological treatment technology with broad prospects due to the advantages of low investment, low energy consumption and good treatment effect. Among many factors, granular sludge with high biological activity is the key to the anaerobic biological treatment process, which is directly related to the start-up rate, degradation efficiency and stability of the anaerobic biological treatment system. How to obtain and maintain granular sludge with high biological metabolic activity in the treatment system is a permanent proposition for relevant practitioners. [0003] In the treatment of wastewater containing high concentrations of ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
CPCC02F3/2813
Inventor 黄明智易晓辉阮菊俊王晓珊章涛孔少飞应光国
Owner SOUTH CHINA NORMAL UNIVERSITY
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