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Electro-coupling biological carbon removal and denitrification treatment method of low C/N ratio wastewater

An electrical coupling, nitrogen treatment technology, applied in electrochemical biological treatment, biological water/sewage treatment, water/sludge/sewage treatment, etc. Low C/N ratio, saving operating costs, and enhancing the effect of activity

Active Publication Date: 2019-03-29
QUZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, adding biofilters is currently the main method of nitrogen standardization, which not only increases the infrastructure cost, but also due to the low COD (about tens of mg / L) and low C / N ratio (about 2.0~ 5.0), it is necessary to artificially add an external carbon source, which greatly increases the operating cost, and at the same time, it is easy to make the COD exceed the standard

Method used

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  • Electro-coupling biological carbon removal and denitrification treatment method of low C/N ratio wastewater
  • Electro-coupling biological carbon removal and denitrification treatment method of low C/N ratio wastewater
  • Electro-coupling biological carbon removal and denitrification treatment method of low C/N ratio wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0035] The treated waste water in the inlet pool 1 is typical slightly polluted water, and the specific water quality is as follows: C / N (carbon-to-nitrogen ratio)=2, chemical oxygen demand (COD average mass concentration) is 72mg / L, TN average mass concentration is 36mg / L; the temperature of the treated wastewater is controlled at room temperature 25°C; the aforementioned wastewater treatment system is used for treatment as the experimental group R1; at the same time, an anaerobic electrically coupled biological system is constructed (the aeration equipment is deleted from the aforementioned wastewater treatment system) , as the control group R2, the specific steps are as follows:

[0036] Step 1. In the initial stage of startup, set the OD of V volume 600 (The absorbance value of the solution at a wavelength of 600nm) The heterotrophic nitrification-aerobic denitrification enrichment bacteria solution with a value of 0.5 was added to the reaction tank 3 . V volume is equal ...

Embodiment 2

[0042] In order to optimize the operating performance of the electrical coupling biological treatment technology under normal temperature conditions, after embodiment 1 was carried out to 27d, after the system was mature and stable, the hydraulic retention time was changed to 8h, and other parameters were unchanged, and after 10 cycles (80 hours) of operation , the wastewater treatment effect fluctuated slightly, and then the hydraulic retention time was changed to 16h, and other parameters remained unchanged. After 10 cycles (160 hours) of operation, the reactor treatment effect did not change significantly.

[0043] The waste water treatment result of embodiment 2 is as Figure 4 Shown (in the figure R1 represents the experimental group, R2 represents the control group). from Figure 4 It can be seen that when the hydraulic retention time was 8h, 12h, and 16h, the COD removal rates of the experimental group R1 were 84.04%, 87.34%, and 85.09%, and the TN removal rates were 4...

Embodiment 3

[0045] In order to verify that the electrically coupled biological treatment technology can achieve effective carbon and nitrogen removal of wastewater with low C / N ratio under normal temperature conditions. When the system in Example 1 is mature and stable, other parameters remain unchanged, and the C / N ratio of the treated wastewater in the inlet pool 1 is adjusted to 2, 3, 4, 5 in turn, and each C / N ratio runs 10 Period, change the C / N ratio after the working condition of the reaction pool 3 tends to be stable.

[0046] The waste water treatment result of embodiment 3 is as Figure 5 Shown (in the figure R1 represents the experimental group, R2 represents the control group). Depend on Figure 5 It can be obtained that when the C / N ratio is 2, 3, 4, 5, the COD removal rates of the experimental group R1 are 87.34%, 89.31%, 82.33%, 86.62%, and the TN removal rates are 62.14%, 75.03%, 70.46%, 86.33%, the COD removal rate of control group R2 is respectively 85.16%, 88.09%, 81...

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Abstract

The invention relates to an electro-coupling biological carbon removal and denitrification treatment method of low C / N ratio wastewater, aiming at solving the technical problems that in an upgrading and reconstruction process of low C / N ratio lightly-polluted wastewater carbon removal and denitrification, a treatment process needs to be added, an external carbon source is artificially added, and the operation effect stability is poor. A wastewater treatment system adopted by the method comprises a water inlet pump, a reactor and an outlet sump, wherein the reactor comprises a reaction tank, apositive electrode plate, a negative electrode plate, an aeration device and bio-filler; a wastewater inlet and a wastewater outlet are respectively formed at two ends of the reaction tank; the bottomof the reaction tank is inoculated with a heterotrophic nitrification-aerobic denitrification enrichment bacteria solution and aerobic sludge; the positive electrode plate and the negative electrodeplate are fixed in the reaction tank. Furthermore, the electro-coupling biological system is capable of providing matrix H2 and can enhance the microbial activity. Therefore, a carbon source requiredfor nitrogen removal by denitrification of the system microorganism is reduced, so that the effluent water quality can reach a class A emission standard or even a stricter local standard when the C / Nratio is only 2-5.

Description

technical field [0001] The invention belongs to the technical field of lightly polluted water treatment, and in particular relates to an electrically coupled biological carbon and nitrogen removal treatment method for lightly polluted waste water with a low C / N ratio. Background technique [0002] With the advancement of my country's economic level, the acceleration of industrialization and urbanization, drinking water sources are polluted from various sources, such as excessive nitrogen and phosphorus nutrients entering the water body, which accelerates the eutrophication of the water body, and the nitrogen problem is becoming more and more serious. At the same time, Zhejiang Province issued the "Guiding Opinions on the Implementation of Clean Discharge Standards for Urban Sewage Treatment Plants in Zhejiang Province (Draft for Comment)", which proposes to further improve the discharge standards on the basis of Grade A, that is, the local standards of Zhejiang Province. Amo...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F3/30
CPCC02F3/005C02F3/302
Inventor 赵芝清沈晓莉严新杰李新宇陶海波陈晓慧许宁张雨晴
Owner QUZHOU UNIV
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