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Method for utilizing critic acid fermentation wastewater

A technology for fermenting waste water and citric acid, applied in the field of environmental engineering, can solve the problems of complex technical process, environmental pollution and high production cost, and achieve the effects of good effect, reduction of concentration cost and reduction of treatment cost.

Inactive Publication Date: 2018-12-07
JIANGNAN UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, the present invention changes its thinking, analyzes and considers from the perspective of resource recycling of "using waste to treat waste", adopts an economical process to remove nitrogen and phosphorus, and concentrates the treated wastewater to maintain a higher BOD, as a chemical industry Or a supplementary carbon source for municipal wastewater biological denitrification and phosphorus removal treatment, solving the problems of complex carbon source preparation technology, high production cost and environmental pollution

Method used

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  • Method for utilizing critic acid fermentation wastewater
  • Method for utilizing critic acid fermentation wastewater
  • Method for utilizing critic acid fermentation wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] This embodiment is accomplished by the following steps:

[0031] (1) Add 30% (w / w) CaO suspension and coagulant PAC

[0032] Take 7m 3 The citric acid fermentation waste liquid was placed in the pilot test reaction tank, and 30% (w / w) CaO suspension was added to adjust the pH to be stable at 8.0, while stirring while flowing, and a concentration of 100g / L coagulant PAC solution 5.6 was added. L, stirred for 20 minutes, free sedimentation for 20 minutes, and left to react for 1.5 hours. See figure 2 .

[0033] The data shows that: when the PAC flow rate is 80mg / L, 160mg / L, and 320mg / L in turn, although the suspended solids (SS), COD, and total phosphorus (TP) of the filtrate obtained in step (2) plate and frame pressure filtration , TN and other indicators increased in turn, but the improvement effect of each indicator removal rate was not obvious. Considering the economic cost, the optimal PAC flow rate was finally determined to be 80mg / L.

[0034] (2) The first s...

Embodiment 2

[0057] The difference between this embodiment and Example 1 is that the 30% (w / w) CaO suspension described in step (1) is changed to 30% (w / w) Ca(OH) 2 Suspension. The content and removal rate of each index before and after plate and frame filtration of citric acid fermentation wastewater are shown in Table 1, and the content of each index of supplementary carbon source is shown in Table 2.

Embodiment 3

[0059] The difference between this embodiment and Example 1 is that the solid-liquid separation process described in step (4) is changed from a decanter centrifugal process to an inclined plate sedimentation tank separation process; the dilution factor of the supplementary carbon source described in step (6) is changed to 1500 times. The content and removal rate of each index before and after plate and frame filtration of citric acid fermentation wastewater are shown in Table 1, and the contents of each index of supplemented carbon source are shown in Table 4.

[0060] Table 4 The content of each index of supplementary carbon source in Example 3

[0061] Test items

[0062] The content and removal rate of each index in the experimental group ② influent and effluent are shown in Table 3; the experimental group ① influent index: COD is 190.2mg / L, BOD 5 114.2mg / L, TN 24.09mg / L, NO 3 - -N is 23.67mg / L; the experimental group ① effluent index: COD is 45.2mg / L, BOD 5 2...

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Abstract

The invention discloses a method for utilizing critic acid fermentation wastewater and belongs to the technical field of environmental engineering. Based on the characteristic that critic acid fermentation wastewater contains a large amount of degradation-resistant mycelia, high concentration BOD, total nitrogen, and total phosphor, nitrogen and phosphor are removed by a precipitation method, highconcentration BOD is taken as an auxiliary carbon source for a biological nitrogen-removing and phosphor-removing treatment of chemical wastewater, the wastes are converted into valuable resources, and the critic acid fermentation wastewater is utilized. The wastewater discharge of critic acid producing enterprises is reduced, the byproduct benefits are increased, and great economic benefits andsocial benefits are generated.

Description

technical field [0001] The invention relates to a method for resource utilization of citric acid fermentation wastewater, in particular to a method for utilizing citric acid fermentation wastewater to produce a supplementary carbon source required in the process of biological denitrification and dephosphorization of chemical or municipal wastewater, and belongs to the technical field of environmental engineering. Background technique [0002] Carbon source is an essential nutrient for microbial growth. Therefore, carbon source plays an important role in the biological treatment-based wastewater treatment process. In the actual wastewater treatment process, the reaction is often weakened due to the lack of carbon source in the anaerobic section. Nitrification process, resulting in reduced nitrogen removal efficiency. Dosing additional carbon sources can meet the requirements of electron donors for denitrification and denitrification in the anaerobic stage, effectively improve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14
CPCC02F1/001C02F1/04C02F1/38C02F1/5236C02F1/66C02F3/02C02F3/082C02F3/1257C02F3/1263C02F9/00
Inventor 刘和柳文浩孙福新苗茂栋郑志永刘宏波
Owner JIANGNAN UNIV
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