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An improved pre-acidification treatment process for citric acid wastewater

A citric acid wastewater, pre-acidification technology, applied in natural water treatment, anaerobic digestion treatment, water/sludge/sewage treatment, etc., can solve problems such as excessive acidification, low efficiency of anaerobic tank treatment, and unstable strains , to achieve the effect of increasing species, improving COD removal rate and biogas production, and improving stability

Active Publication Date: 2016-01-13
RIZHAO JINHE BOYUAN BIOCHEM
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the problems existing in the existing citric acid wastewater citric acid wastewater pre-acidification treatment process, such as excessive acidification, unstable strains, and low anaerobic tank treatment efficiency, the invention provides an improved citric acid wastewater pre-acidification treatment of citric acid wastewater Process, by increasing the pH value of the effluent in the pre-acidification tank, to increase the type and concentration of microorganisms in the pre-acidification tank, so as to improve the treatment efficiency of the wastewater anaerobic processor

Method used

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  • An improved pre-acidification treatment process for citric acid wastewater
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Embodiment 1

[0031] The production wastewater discharged from the production workshop of a citric acid enterprise is 100m 3 / h, its COD is 13000mg / L, and its pH is 6.0.

[0032] An improved citric acid wastewater pre-acidification treatment process for citric acid wastewater. The citric acid wastewater undergoes pre-acidification, anaerobic treatment, and precipitation in sequence to obtain a supernatant. The specific steps include:

[0033] (1) After the citric acid wastewater is mixed with the supernatant A with a flow rate of 50m3 / h at a volume ratio of 1:2, it is pumped into the pre-acidification tank for acidification, and the acidification time is 2 hours;

[0034] (2) After step (1), the effluent after acidification is mixed with 3 times the volume of supernatant B, and then pumped into an anaerobic tank for anaerobic treatment;

[0035] (3) The overflow water from the anaerobic tank enters the sedimentation tank for precipitation to obtain supernatant and sludge. The supernatant C...

Embodiment 2

[0039] The production wastewater discharged from the production workshop of a citric acid enterprise is 100m 3 / h, its COD is 40000mg / L, pH is 4.5.

[0040] An improved citric acid wastewater pre-acidification treatment process for citric acid wastewater. The citric acid wastewater undergoes pre-acidification, anaerobic treatment, and precipitation in sequence to obtain a supernatant. The specific steps include:

[0041] (1) Citric acid wastewater with a flow rate of 25m 3 After the supernatant A of / h is mixed with the ratio of volume ratio 1:8, it is pumped into the pre-acidification tank for acidification, and the acidification time is 3 hours;

[0042] (2) After step (1), the effluent after acidification is mixed with 4 times the volume of supernatant B, and then pumped into an anaerobic tank for anaerobic treatment;

[0043] (3) The overflow water from the anaerobic tank enters the sedimentation tank for precipitation to obtain supernatant and sludge. The supernatant C ...

Embodiment 3

[0047] The production wastewater discharged from the production workshop of a citric acid enterprise is 100m 3 / h, its COD is 30000mg / L, pH is 5.0.

[0048] An improved citric acid wastewater pre-acidification treatment process for citric acid wastewater. The citric acid wastewater undergoes pre-acidification, anaerobic treatment, and precipitation in sequence to obtain a supernatant. The specific steps include:

[0049] (1) Citric acid wastewater with a flow rate of 35m 3 After the supernatant A of / h is mixed with the ratio of volume ratio 1:5, it is pumped into the pre-acidification tank for acidification, and the acidification time is 5 hours;

[0050] (2) After step (1), the effluent after acidification is mixed with 3 times the volume of supernatant B, and then pumped into an anaerobic tank for anaerobic treatment;

[0051] (3) The overflow water from the anaerobic tank enters the sedimentation tank for precipitation to obtain supernatant and sludge. The supernatant C ...

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Abstract

The invention discloses an improved pre-acidifying treatment process of citric acid wastewater. The process comprises the following step: precipitating overflow effluent of an anaerobic tank through a precipitating tank to obtain supernate which consists of supernate A, supernate B and supernate C, wherein the supernate A is returned and mixed with the citric acid wastewater, the supernate B is returned and mixed with acidified effluent, and the supernate C enters into subsequent steps for aerobic treatment to improve the pH value of effluent of a pre-acidifying pool and increase types and concentrations of microorganisms in the pre-acidifying pool so as to improve the pH of anaerobic inflow and reduce the impact to an anaerobic system, thereby improving the treatment efficiency of an anaerobic processor and the stability of the anaerobic treatment system, and meanwhile improving the removal rate of COD (Chemical Oxygen Demand) and the biogas production as well as lowering the operating cost of enterprises.

Description

technical field [0001] The invention belongs to the technical field of industrial sewage treatment, and in particular relates to an improved citric acid wastewater pre-acidification treatment process. Background technique [0002] Anaerobic wastewater treatment is a wastewater treatment technology that combines environmental protection, energy recovery and ecological virtuous cycle, and has good environmental and economic benefits. Anaerobic wastewater treatment technology is a very economical technology, and the cost of wastewater treatment is much lower than that of aerobic treatment, especially for wastewater with medium and high COD concentrations. [0003] The anaerobic treatment of citric acid wastewater mostly adopts the mode of pre-acidification + anaerobic treatment. The reason for pre-acidification of wastewater is mainly to decompose macromolecular organic matter into small molecules and form organic acids to improve the treatment efficiency of wastewater anaerob...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F3/28C02F103/36
CPCY02E50/30
Inventor 寇光智李昌涛周昊刘剑雄安丰民王晓飞
Owner RIZHAO JINHE BOYUAN BIOCHEM
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