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Aerobic granular sludge with pyridine degradation function as well as cultivation and application thereof

An aerobic granular sludge and granular sludge technology, applied in water/sludge/sewage treatment, water pollutants, biological water/sewage treatment, etc. problem, to achieve the effect of high sludge concentration, high degradation efficiency and good settling performance

Active Publication Date: 2014-03-12
NANJING UNIV OF SCI & TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a method for cultivating aerobic granular sludge with pyridine degradation function in view of the current pyridine-contaminated biological treatment system, which has low pyridine tolerance concentration, low treatment load, poor stability, and easy loss of additional special-effect microorganisms.

Method used

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  • Aerobic granular sludge with pyridine degradation function as well as cultivation and application thereof
  • Aerobic granular sludge with pyridine degradation function as well as cultivation and application thereof
  • Aerobic granular sludge with pyridine degradation function as well as cultivation and application thereof

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Embodiment 1

[0028] Embodiment 1: the cultivation of aerobic granular sludge in SBR reactor

[0029] ⑴ SBR reactor operating parameter conditions

[0030] The present invention adopts a sequencing batch reactor (SBR), with a height of 100 cm, an inner diameter of 6 cm, and an effective volume of 2.2 L. The temperature of the reactor is controlled at 30° C. through a water bath. The simulated wastewater containing pyridine was pumped from the bottom of the reactor through a peristaltic pump. There is a drain in the middle of the reactor, and the drain is controlled by a solenoid valve, and the volume exchange rate of the reactor is 50%. The reactor is aerated with an aeration rate of 200L / h through the aeration head to provide sufficient oxygen in the reactor, and at the same time provide high hydraulic shear force for microorganisms to facilitate the formation of aerobic granular sludge. The operation change of water inlet / aeration / sedimentation / drainage in each cycle of the reactor is c...

Embodiment 2

[0043] Example 2: Degradation of pyridine by mature aerobic granular sludge

[0044] Wastewater was prepared according to the composition of pyridine-containing simulated wastewater in Example 1. The initial concentration of pyridine in the reactor after the SBR was fed into the water was about 500mg / L, 1000mg / L, 1500mg / L, 2000mg / L, 2500mg / L, and 3000mg / L. and 4200mg / L. During the operation, the operation cycle was set to 8 hours, the water intake time was set to 5 minutes, the reaction time was set to 7 hours and 40 minutes, the settling time was set to 2 minutes, the drainage time was set to 3 minutes, and the idle time was set to 10 minutes, The aeration rate is 200L / h.

[0045] The results show that (as image 3 ), the mature aerobic granular sludge can completely degrade pyridine in simulated wastewater with an initial pyridine concentration as high as 4200 mg / L in about 7.5 hours. Under the conditions of initial pyridine concentration of 500mg / L, 1000mg / L, 1500mg / L, 2...

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Abstract

The invention discloses aerobic granular sludge with a pyridine degradation function as well as cultivation and application thereof. The sludge is obtained from a single strain (Rhizobiumsp.) NJUST18 with self-flocculation characteristics in a cultivation manner. A pyridine specific degradation strain (Rhizobiumsp.) NJUST18 is adopted as inoculum, a reactor form of a sequencing batch reactor (SBR) is adopted, and formation of pyridine degradation particle sludge is facilitated by using the self-flocculation characteristic of the (Rhizobiumsp.) NJUST18 and controlling the parameters such as operation cycle, sedimentation time and organic load of an SBR system. The aerobic granular sludge with the pyridine degradation function can take pyridine as a sole carbon source and nitrogen source to grow. The aerobic granular sludge is regular in particle shape, good in settling property (the sludge index (SVI) value just is 25.6mL / g), high in sludge concentration of the reaction system (the concentration of mixed liquor volatile suspended solid (MLVSS) can be up to 4610mg / L), and high in degradation efficiency (the maximal degradation rate Vmax can be up to 1867.4mgl<-1>h<-1>). Complete degradation of 4200mg / L of pyridine can be achieved within 7.5 hours in the SBR system after the granular sludge is matured.

Description

technical field [0001] The invention belongs to the technical field of biological treatment of environmental organic pollutants, and in particular relates to a method for cultivating aerobic granular sludge with pyridine degradation function and its application in the treatment of pyridine-containing wastewater. Background technique [0002] Pyridine is biologically toxic, mutagenic and carcinogenic, and its pollution has caused great potential harm to human health and the ecological environment. Therefore, there is a need for targeted technologies that can effectively control pyridine pollution. The biological method to remove pyridine-containing wastewater has no secondary pollution and is economical, and is currently the most widely used wastewater treatment technology. However, due to the stable structure of pyridine and poor biodegradability, ordinary biological treatment cannot work or has low efficiency. In recent years, for pyridine and other refractory pollutants,...

Claims

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Application Information

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IPC IPC(8): C02F3/12C02F101/38
CPCY02W10/10
Inventor 沈锦优张鑫韩艳王连军刘晓东张丽陈丹孙秀云李健生韩卫清
Owner NANJING UNIV OF SCI & TECH
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