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Method for cultivating nitrified granular sludge using anaerobic granular sludge

An anaerobic granular sludge and granular sludge technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc., can solve the problems of low removal rate and low volumetric load of the reactor.

Active Publication Date: 2006-08-23
江苏中宜金大环保产业技术研究院有限公司
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the problems of low reactor volume load and low removal rate in the existing nitrification reactor due to the low concentration of nitrifying bacteria

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Inoculate 150ml of anaerobic granular sludge in the large-scale industrialized UASB (upflow anaerobic reactor) reactor to the upflow aerobic bioreactor equipped with a three-phase separator on the top, and the effective volume of this reactor is 1.2L. The sludge concentration in the reactor after inoculation was about 5.5 g SS / L. The simulated wastewater diluted to an ammonia nitrogen concentration of 50mg / L was used as the reactor influent, and the wastewater was also added with K 2 HPO 4 、KH 2 PO 4 , trace elements, NaHCO 3 Composed of a culture accelerator and a small amount of sodium acetate, the concentration of phosphorus in the simulated wastewater is 0.025g / L, and the concentration of trace elements is 0.0052g Fe / L, 0.0108g Ca / L, 0.0024g Mg / L, 0.00005g Cu / L, 0.00002g B / L, 0.00004g Ni / L, 0.00004g Zn / L, 0.00002g Co / L, 0.00002g Mn / L and 0.00002g Al / L, the concentration of sodium acetate is 0.05g COD / L. The operating conditions of the reactor are as follows: t...

Embodiment 2

[0019] Adopt the inoculation sludge identical with embodiment 1, cultivate promoter by Na 2 HPO 4 , NaH 2 PO 4 , trace elements, NaHCO 3 composition, the concentration of phosphorus in wastewater is 0.05g / L, and the concentration of trace elements is 0.0104g Fe / L, 0.02g Ca / L, 0.005g Mg / L, 0.0001g Cu / L, 0.00002g B / L, 0.0001g Ni / L, 0.0001g Zn / L, and 0.00004g Al / L. The operating conditions of the reactor are: the hydraulic retention time is 20-30h, the temperature is between 20-25°C, the pH value is between 7.5-8.5, and the dissolved oxygen is 1.5-2.5mg / L. The rest of the operation process is the same as in Example 1, and the nitrification granular sludge is obtained in the reactor for about 80 days of continuous cultivation.

Embodiment 3

[0021] Using the same inoculated sludge as in Example 1, the culture accelerator consists of K 2 HPO 4 、KH 2 PO 4 , trace elements, NaHCO 3 composition, the concentration of phosphorus in wastewater is 0.08g / L, and the concentration of trace elements is 0.02gFe / L, 0.02g Ca / L, 0.01g Mg / L, 0.0002g Cu / L, 0.0001g B / L, 0.0002 g Ni / L, 0.0002g Zn / L, 0.0001g Co / L, 0.0001g Mn / L and 0.000lg Al / L. The operating conditions of the reactor are: the hydraulic retention time is 10-15h, the temperature is between 25-32°C, the pH value is between 7.5-8.5, and the dissolved oxygen is 3.5-4.5mg / L. The rest of the operation process is the same as in Example 1, and the nitrification granular sludge is obtained in the reactor for about 75 days of continuous cultivation.

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PUM

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Abstract

The process of cultivating granular nitrified sludge with granular anaerobic sludge includes the following steps: filling the granular anaerobic sludge as inoculum into updraft aerobic bioreactor with triphase separator; adding cultivation promoter comprising proper amount of phosphate and trace elements into waste water containing ammonia nitrogen and organic carbon source or compounded simulating waste water containing P element in 0.02-0.1 g / L; diluting the waste water to ammonia nitrogen concentration of 30-50 mg / L as inflow water for the reactor, domesticating the inoculum in the reactor at temperature 20-35 deg.c, pH 7.5-8.5 and dissolved oxygen of 1.5-5 mg / L for 8-36 hr; raising the ammonia nitrogen concentration in inflow water gradually to 250-350 mg / L after the ammonia nitrogen eliminating rate reaches 85 % and the operation becomes smooth and running for 60-120 days to obtain granular nitrified sludge.

Description

technical field [0001] The invention relates to a method for cultivating nitrification granular sludge by using anaerobic granular sludge, and belongs to the technical field of wastewater biological treatment. technical background [0002] Biological denitrification has been widely used in the denitrification treatment of wastewater because of its economy and effectiveness. Upflow bioreactors with three-phase separators are also widely used. However, since nitrifying bacteria are autotrophic bacteria with an extremely slow growth rate and are extremely sensitive to environmental factors, it is difficult to maintain a large number of nitrifying bacteria in the reactor, resulting in nitrification becoming the rate-limiting in wastewater biological nitrogen removal treatment. step. Granular sludge is a granular microbial aggregate formed by the aggregation and growth of a large number of bacteria. It has a regular shape, a dense structure, and excellent sedimentation properti...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 任洪强魏翔袁粒张蓉蓉
Owner 江苏中宜金大环保产业技术研究院有限公司
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