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Miniaturation method of aerobic sludge for degrading mononitrophenol

An aerobic sludge, nitrophenol technology, applied in chemical instruments and methods, water/sludge/sewage treatment, biological water/sewage treatment, etc. Problems such as large amount of excess sludge, to achieve the effect of strong activity and settling performance

Inactive Publication Date: 2006-09-20
SHANDONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] However, there are many problems in the traditional activated sludge treatment of sewage: the sedimentation speed of sludge is slow, resulting in a large area of ​​sewage treatment equipment and high infrastructure costs; sludge swelling is prone to occur; the amount of residual sludge after treatment is large, and sludge The post-treatment problem is serious; the impact load resistance is poor, the treatment effect is greatly affected by the water quality, some refractory or toxic organic substances will affect the treatment effect, and may cause the paralysis of the treatment system
But for those toxic organic substances that are difficult to degrade, this method is still powerless
Moreover, in the process of use, only the strains can be preserved, and they can be cultivated immediately after use, which is not conducive to storage and transportation

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0019] Select the flocculent activated sludge in the aeration tank of the sewage treatment plant and inoculate it into the SBR reactor, the inoculation amount is 25%, and the inoculated sludge concentration is 304g SS / L. The concentration of nitrophenol in the simulated organic wastewater is 0.2g / L, glucose is 0.12g / L, and COD is 0.4g / L. In addition, NH was added to the wastewater 4 HCO 3 、KH 2 PO 4 、K 2 HPO 4 , trace elements and yeast extract, the concentrations of which are nitrogen (N) 0.02g / L, phosphorus (P) 0.004g / L, magnesium (Mg) 0.005g / L, cobalt (Cu) 0.002g / L L, calcium element (Ca) 0.0075g / L, molybdenum element (Mo) 0.001g / L, iron element (Fe) 0.008g / L, sodium element (Na) 0.0045g / L and yeast extract 0.0007g / L. The operating condition of the reactor is (23±1)°C, the pH value is 7.6, and the hydraulic retention time is 17h. After continuous cultivation for about 120 days, aerobic granular sludge degraded by nitrophenol is obtained in the reactor.

Embodiment 2

[0021] Select the flocculent activated sludge in the aeration tank of the sewage treatment plant and inoculate it into the SBR reactor, the inoculation amount is 25%, and the inoculated sludge concentration is 304g SS / L. The concentration of nitrophenol in the simulated wastewater is 0.39g / L, glucose is 0.15g / L, and COD is 0.7g / L. In addition, NH was added to the wastewater 4 HCO 3 、KH 2 PO4, NaH 2 PO 4 , trace elements and yeast extract, the concentrations of which are nitrogen (N) 0.035g / L, phosphorus (P) 0.007g / L, magnesium (Mg) 0.007g / L, zinc (Zn) 0.001g / L L, cobalt element (Cu) 0.002g / L, calcium element (Ca) 0.008g / L, molybdenum element (Mo) 0.001g / L, iron element (Fe) 0.006g / L, sodium element (Na) 0.008g / L L and yeast extract 0.0007g / L. The operating conditions of the reactor were (25±1)°C, the pH value was 7.6, and the hydraulic retention time was 17 hours. After continuous cultivation for about 110 days, aerobic granular sludge degraded by nitrophenol was obtaine...

Embodiment 3

[0023] Select the flocculent activated sludge in the aeration tank of the sewage treatment plant and inoculate it into the SBR reactor, the inoculation amount is 25%, and the inoculated sludge concentration is 304g SS / L. The concentration of nitrophenol in the simulated wastewater is 0.54g / L, glucose is 0.05g / L, and COD is 0.8g / L. In addition, NH was added to the wastewater 4 Cl, KH 2 PO4, NaH 2 PO 4 , trace elements and yeast extract, the concentration of nitrogen (N) 0.04g / L, phosphorus (P) 0.008g / L, magnesium (Mg) 0.008g / L, zinc (Zn) 0.0015g / L , calcium element (Ca) 0.008g / L, molybdenum element (Mo) 0.0015g / L, iron element (Fe) 0.007g / L, sodium element (Na) 0.008g / L and yeast extract 0.0008g / L. The operating conditions of the reactor were (23±1)°C, the pH value was 7.8, and the hydraulic retention time was 19 hours. After continuous cultivation for about 120 days, aerobic granular sludge degraded by nitrophenol was obtained in the reactor.

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Abstract

This invention provides a method to granulate aerobic mud particles for degrading nitrohydroxybenzene, which includes following steps: a) active muds from aeration pools in sewage disposal plants are collected and transplanted into sequencing bioreactors; b) simulative organic sewage containing nitrohydroxybenzene is prepared; c) the simulative organic sewage containing nitrohydroxybenzene is pump into the sequencing bioreactor from the bottom; d) according to the running mode of the sequencing bioreactor, oxygen is kept off for 10~50 minutes and then air is provided from the reactor bottom with an aeration device; e) the temperature, pH value, hydraulic retention time, organic load and sedimentation time in the sequencing bioreactor are held for a certain period and then aerobic mud particles for degrading nitrohydroxybenzene can be obtained in the reactor. The aerobic mud particles cultivated in this invention perform greater activity and better sedimentation properties. The storage and transportation are convenient, and over 90% nitrohydroxybenzene can be removed.

Description

(1) Technical field [0001] The invention relates to a production method of aerobic granular sludge specially degrading nitrophenol, which is mainly used for treating domestic sewage and industrial wastewater containing nitrophenol. (2) Background technology [0002] With the advancement of science and technology and the improvement of human living standards, more and more environmental problems are gradually facing us, among which the lack of fresh water resources has seriously affected the survival and development of human beings. Protecting water resources has become an urgent task for all mankind. To protect water resources, we must save water on the one hand, and on the other hand, we must treat and recycle the existing sewage. [0003] At present, in sewage treatment, especially in the treatment of urban sewage, the activated sludge process is the most widely used process with the best treatment effect. Activated sludge is composed of different species of microorganis...

Claims

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Application Information

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IPC IPC(8): C02F3/12
CPCY02W10/10
Inventor 王曙光巩文信杨珊珊刘贤伟高宝玉
Owner SHANDONG UNIV
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