Method for rapidly preparing aerobic granular sludge

A technology for aerobic granular sludge and sludge, applied in the field of water treatment, can solve the problems of restricting the application and optimization of aerobic granular sludge, unstable start-up time of aerobic granular sludge, and accelerating aerobic granular sludge, etc. Achieve the effect of saving settling time, good settling performance and large surface tension

Active Publication Date: 2019-11-22
GUANGXI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The formation process of aerobic granular sludge can be accelerated by changing the components of aerobic granular sludge, but the process is complicated and difficult to realize in practical applications.
[0008] One of the bottlenecks limiting the application and optimization of aerobic granular sludge due to the unstable start-up time of aerobic granular sludge
Restricted by certain factors, aerobic granular sludge has not been applied on a large scale worldwide

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] (1) Activated sludge dehydration: extract 20g of sludge from the secondary settling tank of the sewage treatment plant, and remove filamentous and large particles through sieving. Add anionic polyacrylamide with a sludge dry solid content of 3‰, stir to fully flocculate the sludge; then add bagasse cellulose with a sludge dry solid content of 10%, dry the bagasse cellulose at 105°C for 4 hours in the early stage, and then After pulverization and pretreatment until the particle size is 0.425mm-0.5mm, then fully mix the cellulose and sludge by stirring; then add cold gelatin with a dry solid content of sludge of 2‰, and stir to make the sludge fully glued; then Centrifuge and dewater 20min at a rotating speed of 3500r / min as the sludge used in the test, and the moisture content of the sludge is 80%.

[0034] (2) Spherical granulation: Use a granulator to extrude the sludge dehydrated in step (1) from a sieve plate with an aperture of 1.5 mm, and then place the obtained cy...

Embodiment 2

[0037](1) Activated sludge dehydration: extract 20g of industrial sludge produced in the process of sugar industry wastewater treatment, and remove filamentous and large particles through sieving, MLVSS / MLSS in the sludge = 0.78; ultrasonic power 23kHz, ultrasonic time 40s After ultrasonic pretreatment, add polyaluminum chloride with a dry solid content of 2‰ of the sludge, and stir to fully flocculate the sludge; then add straw cellulose with a dry solid content of 15% of the sludge, and dry the straw cellulose at 105°C in the early stage Dry for 4 hours, and then crush and pretreat until the particle size is 0.425mm-0.5mm, stir to fully mix the cellulose and sludge; then add Welan gum with a dry solid content of sludge of 3‰, and stir to make the sludge fully glued ; Then centrifuge and dewater 15min as the sludge used in the test at a rotating speed of 4000r / min, and the moisture content of the sludge is 78%.

[0038] (2) Spherical granulation: Use a granulator to extrude t...

Embodiment 3

[0041] (1) Activated sludge dehydration: extract 20g of residual sludge from sewage treatment plant, remove filamentous and large particles through sieving, MLVSS / MLSS in the sludge=0.75; after ultrasonic pretreatment with ultrasonic power of 25kHz and ultrasonic time of 30s, Add polyferric sulfate with sludge dry solid content of 1.5‰, stir to fully flocculate the sludge; then add bamboo cellulose with sludge dry solid content of 5%, bamboo cellulose is dried at 105°C for 4 hours in the early stage, and then pulverized Pretreatment until the particle size is 0.425mm-0.5mm, stirring to fully mix the cellulose and sludge; then adding xanthan gum with a dry solid content of the sludge of 1.5‰, stirring to make the sludge fully glued; then at 3000r / min Centrifuge and dehydrate for 25 minutes as the sludge used in the test, and the moisture content of the sludge is 75%.

[0042] (2) Spherical granulation: Use a granulator to extrude the sludge dehydrated in step (1) from a sieve p...

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Abstract

The invention discloses a method for rapidly preparing aerobic granular sludge. The method comprises the following operation steps: (1) extracting sludge with relatively high biological activity; (2)carrying out ultrasonic pretreatment on the sludge; (3) adding a flocculating agent into the sludge, wherein the adding amount of the flocculating agent is 0.15-0.3% of the mass of dry solids of the sludge; (4) adding lignocellulose into the sludge, wherein the adding amount of lignocellulose is 5-15% of the mass of the sludge dry solids; (5) adding microbial exopolysaccharides into the sludge, wherein the addition amount of the microbial exopolysaccharides is 0.15-0.3% of the mass of dry solids of the sludge; and (6) carrying out centrifugal dehydration and granulation on the sludge to obtainthe aerobic granular sludge. The obtained aerobic granular sludge is put into an aeration tank to serve as a nuclear substance for inoculating the granular sludge, the culture period is short, the system is stable, and rapid utilization and engineering practice can be achieved. Compared with traditional activated sludge, the prepared activated sludge is good in settling performance and short in settling time, meanwhile, the added chemical agents cannot influence the activity of microorganisms in the sludge, and the efficiency of a wastewater treatment system is improved.

Description

technical field [0001] The invention belongs to the technical field of water treatment, in particular to a method for rapidly preparing aerobic granular sludge applied to wastewater treatment. Background technique [0002] With the rapid development of economy and society, and the acceleration of industrialization and urbanization, a large amount of toxic and harmful substances are accumulated in natural water bodies, and the fresh water resources that human beings depend on for survival are seriously polluted. This has led to a series of water ecological environment problems that need to be solved urgently. Among them, the eutrophication of water body has become the main water environment problem that seriously threatens the aquatic animals and plants, human health and the development of industry and agriculture, and the main cause of water eutrophication is the excessive discharge of nitrogen and phosphorus in domestic sewage. [0003] There are many problems in the water...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F11/15C02F11/14C02F11/147C02F11/143C02F11/148C02F11/00C02F11/127C02F3/34C02F101/16
CPCC02F11/15C02F11/14C02F11/147C02F11/143C02F11/148C02F11/00C02F11/127C02F3/34C02F2209/08C02F2209/14C02F2209/16
Inventor 朱红祥孙琢熊建华谢雨衡张健
Owner GUANGXI UNIV
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