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Method for synchronously removing nitrogen and phosphorus in sewage containing nitrogen and phosphorus

A simultaneous denitrification and dephosphorization and sewage technology, applied in chemical instruments and methods, biological water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as poor effect, achieve good treatment effect and low reaction cost , the effect of a wide range of sources

Inactive Publication Date: 2012-07-25
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0008] The present invention aims at the problem of poor effect existing in existing nitrogen and phosphorus-containing wastewater synchronous denitrification and dephosphorization methods. The sulfur source of Thiobacillus uses the biochemical characteristics of Thiobacillus denitrificans and the properties of ferrous sulfide to remove nitrogen from water by using Thiobacillus denitrificans as an oxidant to oxidize ferrous sulfide under anaerobic conditions. Iron ions remove phosphorus in water, so as to realize the integration of nitrogen and phosphorus removal, and the effect of nitrogen and phosphorus removal is remarkable

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0032] In this example, the separation and screening process of Thiobacillus denitrifica is based on anaerobic activated sludge as the source of strains, from which it is screened that can use sulfide as the final electron donor, and use NO as the final electron donor. 3 - As the electron acceptor, the target strain of autotrophic denitrification, the specific process is as follows:

[0033] (1) Prepare the suspension of anaerobic sludge, and take the upper layer after standing still. Preparation of medium for Thiobacillus denitrificans: NaS 2 o 3 ·5H 2 O 0.5g / L, KNO 3 0.2g / L, KH 2 PO 4 0.2g / L, NaHCO 3 0.1g / L, MgCl 2 ·6H 2 O 0.05g / L, NH 4 Cl 0.05g / L, FeSO 4 ·7H 2 O 0.001g / L; adjust the final pH of the medium to 7.00±0.05 with NaOH and HCl solutions. Dispense the medium into 150mL Erlenmeyer flasks, inoculate 5mL of samples per 100mL of medium, fill with carbon dioxide gas and seal, then place in a constant temperature water bath shaking shaker at 28°C for 4 day...

Embodiment 2

[0043] The separation and screening process of Thiobacillus denitrificans in this example is the same as in Example 1. In this example, the initial NO of nitrogen and phosphorus-containing sewage is artificially prepared. 3 - -N concentration was 53mg / L, TP concentration was 113.97mg / L, the pH value of the water sample was 9.00±0.05, and the water temperature was maintained at 35±5°C.

[0044] Add 30 g of ferrous sulfide with a particle size of 3 to 5 mm in the reaction vessel, then add nitrogenous and phosphorus-containing wastewater into the reaction vessel, and then inoculate the above-mentioned cultured Thiobacillus denitrificans bacterium liquid. It is 8% of the volume of the sewage to be treated. It is sealed after being filled with carbon dioxide, and placed in a 40°C, 25r / min rotary incubator to react for 6 days. The effluent after the reaction is separated from the solid and liquid, and the nitrogen and phosphorus in the sewage can be removed. Water NO 3 - -N conce...

Embodiment 3

[0046] The separation and screening process of Thiobacillus denitrificans in this example is the same as in Example 1. In this example, the initial NO of nitrogen and phosphorus-containing sewage is artificially prepared. 3 - -N concentration was 53mg / L, TP concentration was 227.94mg / L, the pH value of the water sample was 5.00±0.05, and the water temperature was kept at 15±5°C.

[0047] Add 30 g of ferrous sulfide with a particle size of 2 to 8 mm in the reaction vessel, then add nitrogenous and phosphorus-containing wastewater into the reaction vessel, and then inoculate the above-mentioned cultured Thiobacillus denitrificans bacterium liquid. It is 10% of the volume of the sewage to be treated. It is sealed after being filled with carbon dioxide, and placed in a 10°C, 23r / min rotary incubator for 4 days of reaction. After the reaction, the effluent is subjected to solid-liquid separation, and the nitrogen and phosphorus in the sewage are removed. Water NO 3 - -N concentr...

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Abstract

The invention discloses a method for synchronously removing nitrogen and phosphorus in sewage containing nitrogen and phosphorus, belonging to the field of sewage treatment. The method comprises the steps of (1) screening thiobacillus denitrificans: screening thiobacillus denitrificans from anaerobic activated sludge and taking as target strain, wherein thiobacillus denitrificans utilizes sulphur source in ferrous sulfide to conduct autotrophic denitrification; (2) preparing fillers of a reactor: directly adding ferrous sulfide with the particle size smaller than 25mm in a reaction container; (3) adding sewage: feeding sewage to be treated into the reaction container, wherein the sewage to be treated is the sewage containing nitrogen and phosphorus with the pH value of 5.0-9.0; (4) conducting the autotrophic denitrification process: conducting the mixed reaction for 2 to 6d at the temperature of 10 DEG C-40 DEG C under the anaerobic condition in the reaction container, reducing NO2<-> and NO3<-> in water to be N2 by thiobacillus denitrificans while simultaneously oxidizing ferrous sulfide by thiobacillus denitrificans, and simultaneously, precipitating phosphorus in water by utilizing iron ions (being oxidation products); and (5) separating solid and liquid. According to the method, the technology for removing nitrogen by utilizing thiobacillus denitrificans and the technology for removing phosphorus by using iron ions are fused naturally, the reaction cost is low, and the processing effect is good.

Description

technical field [0001] The present invention relates to the field of sewage treatment, and more specifically, relates to a method for synchronous denitrification and dephosphorization of sewage containing nitrogen and phosphorus. Stable and efficient denitrification by Bacteria combined with chemical dephosphorization of iron ions to achieve simultaneous denitrification and dephosphorization. It is suitable for the treatment of nitrogen and phosphorus-containing sewage, the control of eutrophication in water bodies and the restoration of polluted water bodies. Background technique [0002] In recent years, due to the intensification of human activities, a large amount of pollutants such as nitrogen and phosphorus have been discharged into water bodies, resulting in increasingly serious eutrophication of receiving water bodies. The eutrophication of the water body causes algae and other plankton to multiply rapidly, and the dissolved oxygen in the water body decreases, causin...

Claims

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Application Information

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IPC IPC(8): C02F3/28C02F3/34
Inventor 李睿华李杰牛建敏张菁王夏琳刘波
Owner NANJING UNIV
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