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Quick preparation method for aerobic granular sludge

An aerobic granular sludge, fast technology, applied in the direction of sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the practical application of aerobic granular sludge technology, the effluent water quality cannot meet the standard, The effect is not particularly ideal, etc., to achieve the effect of high activity of aerobic granular sludge, easy industrial application, and low processing cost

Pending Publication Date: 2019-06-28
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0011] Using activated sludge as inoculation, the cultivation time of aerobic granular sludge generally takes more than 40-60 days, which limits the practical application of aerobic granular sludge technology
The increase in operating costs, and the quality of effluent water during the start-up process is often not up to standard; some methods of accelerating the process of sludge granulation by adding coagulation nuclei or flocculants, on the one hand, increase operating costs, and on the other hand, the effect is not special ideal
However, the above-mentioned dewatered sludge or dried sludge is used as inoculation sludge, and the shape is irregular without spherical granulation, and the particles are still easily broken or disintegrated due to hydraulic shearing and other effects.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0034] A rapid preparation method of aerobic granular sludge includes the following steps:

[0035] (1) Sludge dewatering: Take 50kg of the remaining sludge discharged from the secondary settling tank of the sewage plant, MLVSS / MLSS=0.75, add 0.3% of the dry solids of the sludge to the conditioner cationic polyacrylamide, and mechanically stir for 20 minutes to obtain Condition the sludge; mix the crushed lignocellulosic bagasse with a particle size of less than 0.5mm, and mix thoroughly. The mixing amount is 30% of the dry solids mass of the sludge; after mechanical pressure filtration, the sludge moisture content is reduced to 70%;

[0036] (2) Screw conveying, extrusion and dicing: Through the continuous rotation of the screw conveying squeeze shaft, the dehydrated sludge is extruded from the sieve plate with a hole diameter of 5mm, and the electric slicer cuts to obtain cylindrical sludge particles. , Falling on the discharge tray below the discharge port;

[0037] (3) Spherica...

Embodiment 2

[0039] A rapid preparation method of aerobic granular sludge includes the following steps:

[0040] (1) Sludge dewatering: Take 50kg of the remaining sludge discharged from the secondary settling tank of the sewage plant, MLVSS / MLSS=0.68, add 0.15% of the dry solids of the sludge, and stir for 15 minutes to obtain the conditioning sludge Sludge; add straw with 20% of dry sludge mass, and then dewater, after mechanical filter press, the sludge moisture content is reduced to 80%;

[0041] (2) Screw conveying, extrusion and dicing: Through the continuous rotation of the screw conveying squeeze shaft, the dehydrated sludge is extruded from the sieve plate with a hole diameter of 3mm, and the electric slicer cuts to obtain cylindrical sludge particles. , Falling on the discharge tray below the discharge port;

[0042] (3) Spherical granulation: After the cylindrical sludge particles fall into the discharge tray, they enter the rotating drum of the spherical granulator. After the cylindr...

Embodiment 3

[0044] (1) Sludge dewatering: Take 50kg of the remaining sludge discharged from the secondary settling tank of the sewage plant, MLVSS / MLSS=0.70, add 0.2% non-ionic polyacrylamide of dry sludge mass, and stir for 10 minutes to obtain conditioning sludge; Adding 25% of the dry solids of the sludge sawdust, and then dewatering, after mechanical pressure filtration, the sludge moisture content is reduced to 75%;

[0045] (2) Screw conveying, extrusion and dicing: Through the continuous rotation of the screw conveying squeeze shaft, the dehydrated sludge is extruded from the sieve plate with a hole diameter of 4mm, and the electric slicer is cut to obtain cylindrical sludge particles. , Falling on the discharge tray below the discharge port;

[0046] (3) Spherical granulation: After the cylindrical sludge particles fall into the discharge tray, they enter the rotating drum of the spherical granulator. After the cylindrical sludge particles are granulated in the drum for 5 minutes, aer...

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Abstract

The invention relates to a quick preparation method for aerobic granular sludge. The quick preparation method comprises the following steps of dehydrating, spirally conveying, extruding, slicing and forming and spherically forming sludge successively. The prepared aerobic granular sludge can be input to an aerating pond as inoculating sludge and is used in a reactor suitable for culturing the aerobic granular sludge in a matched manner. Compared with the prior art, the aerobic granular sludge prepared by the method has the advantages of being low in processing cost, quick to discharge, high inactivity, high in granularity and the like.

Description

Technical field [0001] The invention relates to the fields of environmental engineering and water treatment engineering, in particular to a method for making oxygen granular sludge for spherical granulation after sludge dewatering. Background technique [0002] With the rapid development of economy and society, the situation of more people and less land is becoming more and more serious. Wastewater treatment urgently needs less land, low energy consumption and efficient processes. The traditional activated sludge process limits and affects its application in sewage treatment to a certain extent due to its high energy consumption, large land occupation, and excessive surplus sludge. Aerobic Granular Sludge (AGS) is a highly active compact formed by self-aggregation and entanglement of a large number of bacteria and proto-metazoa under aerobic conditions, with good sedimentation and high biomass. And multi-flora biological aggregates. Since Mishma and Nakamura first cultivated AG...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12C02F11/14C02F11/147C02F11/122
CPCY02W10/10
Inventor 王进邱江平李旭东秦弋丰
Owner SHANGHAI JIAO TONG UNIV
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