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Device and method for promoting aerobic sludge granulation by combining magnetic material with moving magnetic field

A technology for moving magnetic fields and magnetic materials, applied in the directions of magnetic materials, chemical instruments and methods, magnetic objects, etc., can solve the problems of accelerating sludge granulation and other problems, and achieve the effect of promoting granulation, low cost and easy operation.

Pending Publication Date: 2020-10-09
ZHEJIANG UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The combination of magnetic material and moving magnetic field can accelerate sludge granulation through the crystal nucleus theory and magnetic field attraction, but some literature points out (The influence of Fe 2+ , Fe 3+ and magnetpowder (Fe 3 o 4 ) on aerobic granulation and their mechanisms), a large number of magnetic materials have a certain inhibitory effect on sludge activity

Method used

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  • Device and method for promoting aerobic sludge granulation by combining magnetic material with moving magnetic field
  • Device and method for promoting aerobic sludge granulation by combining magnetic material with moving magnetic field
  • Device and method for promoting aerobic sludge granulation by combining magnetic material with moving magnetic field

Examples

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Effect test

Embodiment 1

[0041] A method for promoting the rapid formation of aerobic granular sludge by using a magnetic material combined with a moving magnetic field, comprising the following steps:

[0042] 1) Take 3L of ordinary activated sludge cultivated in the laboratory in the reactor, and the sludge concentration is 2g / L;

[0043] 2) Set up a periodic operation program in the reactor in step 1), and operate according to water inflow (10min), aeration (180min), sedimentation (3min), water outflow (2min), and idleness (45min), and the water filling ratio is 50 %;

[0044] 3) When the reactor in step 2) is running to the water inflow stage, add 1.2g of magnetic chitosan, and then add another 1.2g after 24 hours for 5 days, with a total of 6g (100% of the dry sludge mass) %);

[0045] 4) After the reactor in step 3) runs to the end of the aeration stage of each cycle for 30 minutes, the pH automatic adjustment program is automatically started, and the pH of the reactor is adjusted to about 6.0...

Embodiment 2

[0049] A method for promoting the rapid formation of aerobic granular sludge by using a magnetic material combined with a moving magnetic field, comprising the following steps:

[0050] 1) Take 3L of ordinary activated sludge cultivated in the laboratory in the reactor, and the sludge concentration is 1.5g / L;

[0051] 2) Set up a periodic operation program in the reactor in step 1), and operate according to water inflow (10min), aeration (180min), sedimentation (3min), water outflow (1.5min), idle (45.5min), water filling ratio 50%;

[0052] 3) When the reactor in step 2) is running to the water inflow stage, add 1.5g of magnetic chitosan, and then add another 1.5g after 24 hours for 3 days, with a total of 4.5g (dried sludge mass) 120%);

[0053] 4) After the reactor in step 3) runs to the end of the aeration phase of each cycle for 30 minutes, the pH automatic adjustment program is automatically started, and the pH of the reactor is adjusted to about 6.0 for 8 days;

[00...

Embodiment 3

[0057] A method for promoting the rapid formation of aerobic granular sludge by using a magnetic material combined with a moving magnetic field, comprising the following steps:

[0058] 1) Take 3L of ordinary activated sludge cultivated in the laboratory in the reactor, and the sludge concentration is 1.6g / L;

[0059] 2) Set up a cycle operation program in the reactor in step 1), and operate according to water inflow (10min), aeration (180min), sedimentation (3min), water outflow (3min), and idleness (44min), and the water filling ratio is 50 %;

[0060] 3) When the reactor in step 2) runs to the water inflow stage, add 0.336g of magnetic chitosan, add 0.336g again after 24h, and continue for 10 days, with a total of 3.36g (dry sludge mass) 70%);

[0061] 4) When the reactor in step 3) runs to the end of the aeration phase of each cycle for 30 minutes, the pH automatic adjustment program is automatically started, and the pH of the reactor is adjusted to about 6.0 for 15 days...

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Abstract

The invention discloses a device and a method for promoting aerobic sludge granulation by using a magnetic material in combination with a moving magnetic field. The device is reasonable in structuraldesign; and the method comprises the following steps: (1), arranging an activated sludge system reactor according to water inlet, aeration, precipitation, water outlet and idleness; (2), in a water inlet stage, adding a magnetic material into a sludge system of the reactor; (3), controlling the pH value of the tail end of the aeration stage of each period of the reactor to be adjusted to be acidicwithin 30 minutes; (4), at 30 seconds before the aeration stage of each period, automatically controlling a magnet block to move downwards by utilizing a stepping motor to generate a moving magneticfield, and driving a magnetic material and sludge attached to the magnetic material to rapidly sink; and (5), after the SBR operates for 15-30 days, realizing complete granulation, and keeping the aerobic granular sludge a stable structure after long-term operation. The sludge settling performance can be rapidly improved, rapid formation of aerobic granular sludge is promoted, operation is easy and efficient, and practical application is easy.

Description

technical field [0001] The invention belongs to the technical field of wastewater biological treatment, and in particular relates to a device and method for promoting aerobic sludge granulation by using a magnetic material combined with a moving magnetic field. Background technique [0002] Aerobic granular sludge has been widely concerned in recent years because of its good settling performance, high biomass, high removal capacity for pollutants, and the characteristics of less land occupation and lower operating costs in engineering applications. . However, problems such as relatively long aerobic granular sludge cultivation process and relatively harsh cultivation conditions still restrict the development of this technology. The Nereda® technology developed by Delft University of Technology in the Netherlands needs 3-5 months of domestication and cultivation in practical engineering applications to achieve aerobic sludge granulation. The literature published by Li Jun e...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12H01F1/00H01F7/02
CPCC02F3/1263C02F2201/48H01F1/0054H01F7/0231Y02W10/10
Inventor 邹金特钱梦洁李军俞风帆潘继杨
Owner ZHEJIANG UNIV OF TECH
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