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Preparation method for aerobic granular sludge

An aerobic granular sludge and granular technology, applied in the field of water treatment, can solve the problems of less industrialized application demonstration projects, etc., and achieve the effects of short cycle, saving floor space and stable system

Inactive Publication Date: 2016-05-18
FUDAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, so far, there have been many researches on the activated sludge technology of dosing chemical method, but there are only a few industrial application demonstration projects, and they focus on the use of inorganic salt flocculants.

Method used

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  • Preparation method for aerobic granular sludge
  • Preparation method for aerobic granular sludge

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Experimental program
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Effect test

Embodiment 1

[0029] Take the sludge from the thickening tank of a sewage treatment plant, the water content is 98%, the concentration of polyvinylamidine is added to the sludge is 0.04g / L, and the sludge is made into granular sludge after stirring for 15 minutes. Taking domestic sewage from a sewage plant, its COD was measured to be 358 mg / L. After adding activated sludge and granular sludge of the same quality, they were aerated for 15 minutes to settle. The removal rates of COD in domestic sewage were 34% and 46%, respectively, and the adsorption effect of granular sludge on COD was better than that of activated sludge, and the granular sludge could settle within 5 minutes.

Embodiment 2

[0031]Mix and dissolve polyvinyl amidine with water to form a mixed solution with a concentration of 0.1% by mass, take sludge from a concentration tank of a sewage treatment plant, the water content is 98.5%, and add polyvinyl amidine to the sludge at a concentration of 0.03g / L , made into granular sludge after stirring for 15 minutes. Take the wastewater from a chemical plant, its CODcr is about 20400mg / L, add activated sludge and granular sludge of the same quality respectively, and prepare a mixed solution with an initial CODcr concentration of about 7220mg / L, and after aeration for 15 minutes, the measured The removal rates of COD by activated sludge and granular sludge are 23% and 47%, respectively. The adsorption effect of granular sludge on COD and TN is better than that of activated sludge, and granular sludge can settle within 5 minutes.

Embodiment 3

[0033] The COD of the biogas slurry wastewater from the breeding plant is about 1600mg / L, and the water sample with a COD of about 500-600mg / L is prepared according to a certain ratio with tap water and biogas slurry as the influent, and the activated sludge biochemical system is compared with the use of polyvinyl amidine The removal rate of organic matter by the biochemical system made of granular sludge with sludge with a water content of 98.5%. The quality of sludge in the two processes is basically the same. Under the condition of continuous water inflow and aeration for 8 hours, the removal rates of activated sludge and granular sludge for COD in biogas slurry were 25% and 46%, respectively, and aerobic granular sludge The removal rate of COD in sewage is greater than that of activated sludge, and the settling time is much shorter than that of aerobic activated sludge.

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Abstract

The invention belongs to the technical field of water treatment, and particularly relates to a preparation method for aerobic granular sludge. The preparation method comprises the steps that firstly, activated sludge in a secondary settling pond is pumped out, then a proper quantity of guanyl containing positive ion macromolecular chemical agent is added into the activated sludge, stirring or fully aeration mixing is carried out, and the needed granular activated sludge can be formed within 30 min. The preparation method has the advantages that compared with the activated sludge, the granular sludge formed by adding a screened guanyl compound is good in settling property, settling time is saved, meanwhile, the biological activity of the sludge is not affected by the added chemical agent, and the efficiency of a waste water treatment system can be improved. According to the method, the pelleting speed for generating the granular sludge is high, the period is short, the system is stable, and the granular sludge can be fast used for engineering practice.

Description

technical field [0001] The invention belongs to the technical field of water treatment, and in particular relates to a method for preparing granular sludge in wastewater treatment. Background technique [0002] With the rapid development of society, people's ever-increasing living needs are met, but at the same time, new problems are brought to the environment. The total amount of sewage treatment in the city is increasing continuously. At present, most of the sewage treatment processes adopt the activated sludge method. While this process can better treat municipal sewage, it also brings about the problem of sludge treatment and disposal, secondary pollution caused by sludge incineration and sludge filling. Burying the occupied urban land makes sludge disposal a difficult problem. On the other hand, leachate from some chemical industries, printing and dyeing industries, and landfills are wastewater with complex components and difficult treatment, and even contain toxic an...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12B01J20/26B01J20/30C02F1/28
CPCB01J20/26B01J2220/4887C02F1/288C02F3/12Y02W10/10
Inventor 何坚赵海君张文宇赵鎔文贻勇
Owner FUDAN UNIV
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