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A method of using microbial flocculation to form granular sludge to treat zinc-containing wastewater

A technology of microbial flocculation and granular sludge, applied in biological water/sewage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the problem of granular sludge settling performance is not very ideal, low molecular weight, expensive and other issues, to achieve the effect of clean and sustainable production process, low production cost and reduced processing cost

Active Publication Date: 2018-02-09
CENT SOUTH UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, these flocculants are usually expensive, and polyacrylamide has certain toxicity. Due to the low molecular weight of polysaccharides and amino acids, the sedimentation performance of the formed granular sludge is not very ideal.

Method used

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  • A method of using microbial flocculation to form granular sludge to treat zinc-containing wastewater
  • A method of using microbial flocculation to form granular sludge to treat zinc-containing wastewater
  • A method of using microbial flocculation to form granular sludge to treat zinc-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0031] Inoculate Aspergillus (CGMCC No.5858) onto potato solid medium at 37°C and cultivate for 7 days to activate. The activated Aspergillus was inoculated into 100mL liquid potato medium, and cultured at 30°C for 3 days. After 3 days of growth, Aspergillus formed loose mycelium balls. Using 1500rpm magnetic stirring for 5 hours to break up the large mycelium balls to obtain loose mycelium. Take 5 mL of the dispersed bacterial liquid and re-inoculate it into 100 mL of liquid potato medium, and incubate at 30°C for 48 hours to form a large number of small mycelial balls with a diameter of about 2 mm. Adjust the pH value of the living filamentous fungus to 9.0±0.2. The living filamentous fungus is stored in a Erlenmeyer flask for future use.

[0032] A reaction beaker was placed on a constant temperature magnetic stirrer, and 100 mL of a ZnO-containing suspension (solid concentration: 1.5 g / L) was added to it. The reaction temperature was controlled at 25° C., and the rotati...

Embodiment 2

[0035]Inoculate Aspergillus (CGMCC No.5858) onto potato solid medium at 37°C and cultivate for 7 days to activate. The activated Aspergillus was inoculated into 100mL liquid potato medium, and cultured at 30°C for 3 days. After 3 days of growth, Aspergillus formed loose mycelium balls. Using 1500rpm magnetic stirring for 5 hours to break up the large mycelium balls to obtain loose mycelium. Take 5 mL of the dispersed bacterial liquid and re-inoculate it into 100 mL of liquid potato medium, and culture it at 30°C for 48 hours to form a large number of small mycelial balls with a diameter of about 2 mm. Glutaraldehyde solution was added to inactivate. The concentration of glutaraldehyde after addition was 2.5%. It was left standing at room temperature for 6 hours, and its pH value was adjusted to 9.0±0.2. The inactivated mycelium was placed in a glass bottle for later use.

[0036] A reaction beaker was placed on a constant temperature magnetic stirrer, and 100 mL of a ZnO-con...

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Abstract

The invention belongs to the technical field of environment protection and particularly relates to a method for treating zinc-containing wastewater by utilizing granular sludge formed through microbiological flocculation. In the chemical precipitation treatment process of the zinc-containing wastewater, efficient gathering of precipitates is the key to formation of rapidly precipitated granular sludge. Therefore, microorganism-based filamentous fungi which have branched network structures and have higher non-covalent bond action with micro-nano particles are applied to the forming process of chemically precipitated granular sludge, and the filamentous fungi are low in cost, widely sourced, stable in property and convenient for large-scale application. The sedimentation rates of chemically precipitated granular sludge obtained with a living filamentous fungus method and chemically precipitated granular sludge obtained with a dead filamentous fungus method reach 3.2 cm / s and 3.0 cm / s respectively and are far higher than that of flocculent sludge. Thus, the method is a cheap, safe and efficient method for promoting formation of chemically precipitated granular sludge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a method for treating zinc-containing wastewater by using microbial precipitation to form granular sludge. Background technique [0002] In the process of zinc-containing wastewater treatment, the sedimentation and separation performance of the sludge is a very important indicator. If the sedimentation and separation effect of the generated sludge is poor, it is easy to cause the sludge to dissolve in the subsequent sedimentation and transportation process, and the zinc in the sludge It will return to the supernatant, making the effluent water quality worse. In the process of treating zinc-containing wastewater by chemical precipitation, the sludge formed is generally flocculent, and its sedimentation rate is often less than 1cm / s, which makes it difficult to achieve the purpose of efficient solid-liquid separation. In order to solve this problem, th...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/34C02F101/20
CPCC02F3/347C02F2101/20
Inventor 李青竹柴立元颜旭叶丽君王庆伟闵小波杨志辉廖骐
Owner CENT SOUTH UNIV
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