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Method for relieving membrane pollution of aerobic membrane bioreactor

A membrane bioreactor and membrane fouling technology, applied in chemical instruments and methods, biological water/sewage treatment, sustainable biological treatment, etc., to achieve the effect of alleviating membrane fouling, reducing operating costs, and increasing service life

Pending Publication Date: 2020-05-08
FUJIAN AGRI & FORESTRY UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In the prior art, there is no report about enriching the flora with the aerobic conversion function of polysaccharides to alleviate the membrane fouling of aerobic membrane bioreactors

Method used

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  • Method for relieving membrane pollution of aerobic membrane bioreactor
  • Method for relieving membrane pollution of aerobic membrane bioreactor
  • Method for relieving membrane pollution of aerobic membrane bioreactor

Examples

Experimental program
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Effect test

Embodiment 1

[0026] Take 350mL of aerobic activated sludge inoculum. The sludge is taken from the aerobic section activated sludge of Fuzhou Jinshan Wastewater Treatment Plant. The activated sludge is passed through a 300-mesh iron sieve to remove non-biological impurities such as fine sand, and then 500mL of Inorganic salt medium (conventional medium, pH value is 7.2-7.8, its composition is NaNO 3 550mg / L; NaHCO 3 500mg / L; KH 2 PO 4 60mg / L; Na 2 SO 4 20mg / L; CaCl 2 10mg / L; MgSO 4 ·7H 2 O 7.0mg / L; FeSO 4 ·7H 2 O 15mg / L; H 3 BO 3 0.4mg / L; ZnSO 4 ·7H 2 O 1.8mg / L; CuSO 4 ·5H 2 O 0.7mg / L; MnCl 2 4H 2 O 0.6mg / L; NaMoO 4 2H 2 O 0.6mg / L; CoCl 2 ·6H 2 O 0.8mg / L; NiCl 2 ·6H 2 O 0.6mg / L) suspended sludge, vortex oscillation to mix evenly; set the centrifuge at 9000rpm, centrifuge for 4 minutes, remove the supernatant; repeat the above steps 3-5 times to remove residual dissolved organic matter in the sludge.

[0027] Afterwards, 350 mL of activated sludge after cleaning ...

Embodiment 2

[0031] In an aerobic membrane bioreactor ( image 3 , volume is 10L), inoculate this aerobic polysaccharide hydrolysis flora, inoculum size is 125mL / L, adopt blower aeration, maintain dissolved oxygen (DO) at 5mg / L. Under the condition of a temperature of 26°C, it was operated continuously for 100 days with domestic sewage (CODcr 380mg / L) as the substrate, and the water inflow rate was 8.5L / day. Other operations were the same as in Example 1. After testing, the COD of the effluent is lower than 20mg / L, and the membrane fouling has been greatly improved, the membrane flux is stable, and the effluent rate is 8.5L / day. Moreover, the effluent basically meets the requirements of Grade A in the Discharge Standard of Pollutants for Urban Sewage Treatment Plants (GB 18918-2002).

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Abstract

The invention provides a method for relieving membrane pollution of an aerobic membrane bioreactor. The method comprises the following steps: S1, taking aerobic activated sludge, suspending, oscillating and uniformly mixing the aerobic activated sludge by using a culture medium, performing centrifuging to remove supernate, and repeating the operation for several times to remove soluble organic matters; S2, inoculating the aerobic activated sludge obtained in the step S1 into an aerobic reactor, adding an inorganic culture medium, xanthan gum and carrageenan, introducing air, performing continuous culturing for 60-100 days at the temperature of 20-35 DEG C, and enriching aerobic polysaccharide hydrolysis flora; and S3, inoculating the aerobic polysaccharide hydrolysis flora enriched in thestep S2 into the aerobic membrane bioreactor in sewage treatment at the inoculation amount of 85-250mL / L, introducing air, maintaining the dissolved oxygen at 2-5mg / L, and performing continuous operating at the temperature of 20-40 DEG C. The method can effectively relieve membrane pollution of the aerobic membrane bioreactor and is low in cost.

Description

technical field [0001] The invention relates to a method for alleviating membrane pollution of an aerobic membrane bioreactor, and belongs to the technical field of membrane bioreactors. Background technique [0002] Activated sludge method is a wastewater biological treatment technology based on activated sludge. This technology mixes wastewater with activated sludge (microbes) and aerates it to decompose the organic pollutants in the wastewater. The biosolids are then separated from the treated wastewater and part of it can be returned to the aeration tank as needed. However, with the improvement of my country's urban sewage discharge standards, membrane bioreactors (Membrane BioReactor, MBR) are gradually used in sewage treatment plants to ensure the quality of effluent water. MBR reactor is a new type of high-efficiency wastewater treatment system that combines membrane separation technology and biological treatment technology. This technology (such as ultrafiltration m...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/12
CPCC02F3/1268Y02W10/10
Inventor 张放曾建雄戴昆
Owner FUJIAN AGRI & FORESTRY UNIV
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