Process for rapidly culturing aerobic granular sludge

An aerobic granular sludge and rapid technology, applied in water/sludge/sewage treatment, biological water/sewage treatment, chemical instruments and methods, etc., can solve the problems of long start-up period, loose structure, low stability, etc. Achieve the effects of good structural stability, faster formation time and higher concentration

Active Publication Date: 2021-09-24
华润环保应用技术研究(深圳)有限公司
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  • Application Information

AI Technical Summary

Problems solved by technology

[0004]However, because the aerobic granular sludge technology has certain technical barriers, there are high technical requirements for the process operation, and the formation principle of aerobic granular sludge in China The research started relatively late, lacking the theoretical knowledge of the key steps in its formation process, resulting in the immature domestic rapid start-up method for aerobic granular sludge
At present, the start-up period of aerobic granular sludge in China is long, and the formation process of aerobic granular sludge is not mature and the stability is not high; for the method of rapid start-up of aerobic granular sludge, the cost of directly injecting signal molecules is high. The economic benefits in actual engineering projects are low; the rapid start-up of aerobic granular sludge will easily lead to its loose structure, and the long-term operation will lead to granulation and disintegration

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A process for rapidly cultivating aerobic granular sludge, comprising the following steps performed in sequence:

[0026] S1: Add the first water, the induced nucleus, the pretreated sludge and the first untreated flocculent sludge into the reaction chamber in sequence to obtain a reaction system;

[0027] S2: at room temperature, aerate the reaction system for 315-325 minutes, precipitate and layer, add second water after draining;

[0028] S3: Repeat step S2 until aerobic granular sludge is formed;

[0029] In the step S1, the concentration of calcium ions in the first water is 20-50mg / L, and the amount of the first water added is 80-90% of the effective volume of the reaction chamber; 1-5% of the effective volume of the cavity; the pretreatment sludge is the sludge obtained after the contained microorganisms are subjected to wall-breaking treatment, and its concentration in the reaction system is 1200-1500mg / L; the second The concentration of untreated flocculent s...

Embodiment 2

[0032] On the basis of the above scheme, calcium ions are also added to the second water until the first untreated flocculent sludge added in the step S3 begins to granulate, so as to avoid the excessive release of signal molecules from causing cell Excessive secretion of the exopolymer avoids affecting the settling performance and treatment capacity of the aerobic granular sludge; when calcium ions are added, the calcium ion concentration in the second water is 20-50 mg / L.

Embodiment 3

[0034] On the basis of the above solution, clean water and sewage are used alternately during the execution of steps S1 to S3, wherein the first water is sewage, and the second water is sewage or clean water. The carbon-to-nitrogen ratio of the sewage is greater than 5, and the pH value is 6.0-7.5.

[0035] Alternate water intake is conducive to creating a starvation environment for microorganisms, stimulating the stress response of microorganisms to harsh environments, releasing the signal molecule AI-2, and promoting the secretion of extracellular polymers (EPS).

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Abstract

The invention provides a process for rapidly culturing aerobic granular sludge, which comprises the following steps in sequence: S1, sequentially adding first water, an induction core, pretreated sludge and first untreated flocculent sludge into a reaction cavity to obtain a reaction system; S2, aerating the reaction system for 315-325min, precipitating and layering, draining, and adding second water; and S3, repeating the step S2 until the aerobic granular sludge is formed, wherein the concentration of calcium ions in the first water is 20-50 mg / L, and the addition amount of the first water is 80-90% of the effective volume of the reaction cavity, the addition amount of the induction nucleus is 1-5% of the effective volume of the reaction cavity, the pretreated sludge is sludge obtained after wall breaking treatment is carried out on contained microorganisms, the concentration of the pretreated sludge in a reaction system is 1200-1500 mg / L, and the concentration of the first untreated flocculent sludge in the reaction system is 6000-15000mg / L. Calcium ions are introduced into water, wall breaking treatment is carried out on part of microorganisms in the sludge, the microorganisms can be accelerated to secrete EPS, sludge granulation and structural stability maintaining after granulation are facilitated, and the granulation time is shortened by 30%-50%.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a process for rapidly cultivating aerobic granular sludge. Background technique [0002] Aerobic granular sludge is an activated sludge sewage treatment technology developed rapidly in the past 20 years, and has been recognized internationally as "the next generation sewage treatment technology". Compared with the traditional activated sludge process, the aerobic granular sludge process has the advantages of excellent settling properties, high biomass, and stronger tolerance to toxic substances and organic load fluctuations. [0003] At present, the main factors affecting the formation of aerobic granular sludge are: hydraulic shear force, carbon source organic load, pH value, free ammonia concentration, reaction temperature, metal cation concentration and sludge settling time. Based on the above factors, domestic scholars put forward a four-stage theory for the formati...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/12C02F2203/004Y02W10/10
Inventor 姜维孙临泉田泽民薛蔚琦蒋䶮
Owner 华润环保应用技术研究(深圳)有限公司
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