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A nano-magnetite coupled wastewater treatment process that enhances the activity of anaerobic microorganisms

An anaerobic microorganism and nano-magnet technology, which is applied in special compound water treatment, anaerobic digestion treatment, water/sludge/sewage treatment, etc., can solve the problem of poor performance of refractory pollutants, acidification, prone to unstable systems, etc. question

Active Publication Date: 2020-04-10
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] The purpose of the present invention is to solve the problems of poor performance of the anaerobic biological treatment system in handling refractory pollutants, prone to instability and system acidification, etc.

Method used

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  • A nano-magnetite coupled wastewater treatment process that enhances the activity of anaerobic microorganisms
  • A nano-magnetite coupled wastewater treatment process that enhances the activity of anaerobic microorganisms

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Preparation of nano-magnetite:

[0029] (1) Configure iron ion mixed solution (Fe 3+ :Fe 2+ =2:1), choose Fe 2 (SO 4 ) 3 ·xH 2 O (0.032mol) and FeSO 4 ·7H 2 O (0.032mol) was dissolved in 0.4mol / L deoxydilute sulfuric acid (400mL), and the complete dissolution of the two iron salts could be accelerated by means of a magnetic stirrer.

[0030] (2) Add excess 1.5mol / L deoxygenated sodium hydroxide solution (500mL) to the mixed solution of iron ions, and fully mix the solution with the aid of a magnetic stirrer. At this time, a black magnetite precipitate will be produced immediately (can be detected by a magnet. ).

[0031] (3) The prepared mixed solution was placed on a magnet, and after 5 minutes, the supernatant was removed by a siphon method to obtain a magnetite precipitate.

[0032] (4) Add 500ml of 0.005mol / L deoxygenated dilute sulfuric acid to the magnetite for precipitation, and mix thoroughly by magnetic stirring to neutralize the anions on the surface....

Embodiment 2

[0038] The nano-magnetite coupling process is used to treat wastewater, wherein the nano-magnetite is the nano-magnetite suspension prepared in Example 1. The specific processing method is as follows:

[0039] 1. Reaction system construction and coupling process parameters

[0040] test group:

[0041] The inoculum sludge is taken from an upflow anaerobic bioreactor that has been in operation for more than one year. The hydraulic retention time of the reactor is 1.5d, and the influent organic load is 2.0kg m -3 d -1 , the mixed liquid sludge concentration (MLSS) is about 30g L -1 . Get part of the sludge, rinse 3 times with PBS damping fluid, add the nano-magnetite suspension prepared in Example 1 (dosing is 1.55gFe / gMLVSS, is equivalent to Fe content in the wastewater of follow-up anaerobic reactor 0.5g Fe / L), the magnetite and anaerobic sludge were fully mixed evenly by magnetic stirring, and inoculated anaerobic sludge was obtained.

[0042] Using the anaerobic bottle...

Embodiment 3

[0047] The nano-magnetite coupling process is used to treat wastewater, wherein the nano-magnetite is the nano-magnetite suspension prepared in Example 1. The specific processing method is as follows:

[0048] 1. Reaction system construction and coupling process parameters

[0049] test group:

[0050] The inoculum sludge is taken from an upflow anaerobic bioreactor that has been in operation for more than one year. The hydraulic retention time of the reactor is 1.5d, and the influent organic load is 2.0kg m -3 d -1 , the mixed liquid sludge concentration (MLSS) is about 30g L -1 . Get part of the sludge, rinse 3 times with PBS damping fluid, add the nano-magnetite suspension prepared in embodiment 1 (dosing is 1.55gFe / gMLVSS, is equivalent to Fe content in the wastewater of follow-up anaerobic reactor 0.5g Fe / L), the magnetite and anaerobic sludge were fully mixed evenly by magnetic stirring, and inoculated anaerobic sludge was obtained.

[0051] Using the anaerobic bot...

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Abstract

The invention relates to a wastewater treatment process with an effect of coupling nano magnetite for enhancing the activity of anaerobic microorganisms, and aims at solving the problems that a traditional anaerobic biological treatment system is easy to acidify, instable in performance and the like. Nano magnetite of which the average particle size is smaller than 100nm is prepared by the steps of dissolving ferric salts, precipitating, separating, washing and the like; the nano magnetite and anaerobic sludge are sufficiently and uniformly mixed at a proportion of 1.55gFe / g MLVSS (Mixed Liquor Volatile Suspended Solid) by a stirring method, a nitrogen blowing method and the like; a mixture is cultured by an anaerobic organism treatment device under the constant temperature condition of 35DEG C; with good electrical conductivity and high specific surface area of the nano magnetite, interspecific electron transfer between the anaerobic microorganisms is remarkably enhanced, the activity of the anaerobic microorganisms is greatly improved, and finally, the performance of an anaerobic organism treatment process is improved.

Description

technical field [0001] The invention relates to a nano-magnetite coupled wastewater treatment process for strengthening the activity of anaerobic microorganisms, which belongs to the technical field of water treatment. [0002] technical background [0003] Anaerobic biological treatment does not require oxygen supply, consumes less energy, has low operating costs, and can convert organic matter in wastewater into bioenergy such as methane and hydrogen. It is the core technology for energy recovery from wastewater. The anaerobic fermentation process requires the synergy of a variety of anaerobic microorganisms, but the balance between anaerobic bacteria is fragile, and they are sensitive to environmental conditions (temperature, pH, redox potential, toxic substances, etc.), and under certain load impacts and toxic substances Under the influence of COD, the anaerobic system is prone to COD removal rate decline, organic acid accumulation, anaerobic sludge floating or washing ou...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28
CPCC02F3/28C02F2305/08
Inventor 汪彩琴朱亮陈琳琳高心怡徐向阳
Owner ZHEJIANG UNIV
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