Denitrification treatment method of high-concentration nitrate wastewater

A treatment method and nitrate technology, applied in water/sewage treatment, anaerobic digestion treatment, chemical instruments and methods, etc., can solve the problems of denitrifying bacteria activity inhibition, secondary pollution of zinc powder, etc., to prevent the loss of filler, The effect of continuous and stable sludge discharge and preventing sludge from clogging the filter screen

Inactive Publication Date: 2020-03-06
CHINA PETROLEUM & CHEM CORP +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

CN106219716A discloses a method for treating high-concentration nitrate wastewater. Under normal temperature and pressure, zinc powder and sulfamic acid are added to high-concentration nitrate wastewater to react. The method does not need to purchase additional wastewater treatment equipment, and NO 3 - Concentration ≤ 15mg / L, but the disadvantage is that the introduction of zinc powder will cause secondary pollution
[0004] In terms of completely eliminating nitrate nitrogen pollution in water bodies and reducing the cost of denitrification, the biological denitrification method is the best method that has been put into practice at present, and has the characteristics of high efficiency and low consumption. The activity of denitrifying bacteria is usually inhibited under root conditions

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  • Denitrification treatment method of high-concentration nitrate wastewater
  • Denitrification treatment method of high-concentration nitrate wastewater
  • Denitrification treatment method of high-concentration nitrate wastewater

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Embodiment 1

[0057] The concentration of nitrate in the industrial wastewater processed in this embodiment is 14344mg / L (NO 3 - The N concentration is 3238mg / L), the COD concentration is 2600mg / L, and the pH is 0.2.

[0058] First, the industrial wastewater is pretreated, including:

[0059] (1) adding alkali (NaOH) to the industrial wastewater to adjust the pH of the influent to 2;

[0060] (2) Add methanol to make COD be 12410mg / L in the waste water after adjusting pH in step (1), COD:NO 3 - The mass concentration ratio of N is 3.8;

[0061] (3) Add nitrogen nutrient salt (ammonia or urea), phosphorus nutrient salt (KH 2 PO 4 or Na 3 PO 4 ) is respectively to make in terms of N elements, the concentration of N is 205mg / L, in terms of P elements, the concentration of P is 41mg / L, and the ratio of the mass concentration of COD:N:P is 302:5:1; Obtain pretreatment waste water.

[0062] (4) The pretreated waste water is passed into the anoxic fluidized bed reactor with a certain flo...

Embodiment 2

[0066] The industrial waste water nitrate content of processing in the present embodiment is 30443mg / L (NO 3 - The N concentration is 6874mg / L), the COD concentration is 5700mg / L, and the pH is 0.4.

[0067] First, the industrial wastewater is pretreated, including:

[0068] (1) adding alkali (NaOH) to the wastewater to adjust the pH of the influent to 2.3;

[0069] (2) Add supplementary carbon source (methanol) to the waste water after pH adjustment in step (1) to make COD 24059mg / L, COD:NO 3 - The mass concentration ratio of N is 3.5;

[0070] (3) Add nitrogen nutrient salt (ammonia or urea), phosphorus nutrient salt (KH 2 PO 4 or Na 3 PO 4 ) is respectively to make in terms of N elements, the concentration of N is 301mg / L, in terms of P elements, the concentration of P is 60mg / L, and the ratio of the mass concentration of COD:N:P is 400:5:1, obtain pretreatment waste water;

[0071] (4) The pretreated waste water is passed into the anoxic fluidized bed reactor wit...

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Abstract

The invention discloses a denitrification treatment method of high-concentration nitrate wastewater. The denitrification treatment method of the high-concentration nitrate wastewater comprises the following steps: step S1, adjusting pH value of nitrate wastewater to 2-4, and adding carbon sources, as well as nitrogen and phosphorus nutrient salts, into the nitrate wastewater after pH-value adjustment so as to obtain wastewater after pretreatment; and step S2, mixing the wastewater after the pretreatment with circulating water so as to obtain mixed water, and introducing the mixed water into ananoxic fluidized bed reactor so as to allow contact between the mixed water and a biological filter, thereby causing denitrification reaction so as to obtain wastewater after denitrification treatment, wherein the circulating water is a product of the denitrification reaction between the wastewater after the pretreatment and the biological filter. Being used for treating high-concentration nitrate wastewater, the denitrification treatment method of the high-concentration nitrate wastewater is relatively low in cost. In addition, the denitrification treatment method of the high-concentration nitrate wastewater is capable of continuously treating high-concentration nitrate wastewater (of which the concentration is 3000-35000 mg / L); and moreover, the method is high in treatment efficiency.

Description

technical field [0001] The invention relates to a denitrification treatment method for high-concentration nitrate wastewater. Background technique [0002] With the increasingly serious trend of water eutrophication, especially the increasing discharge of nitrate in industrial sewage, the natural cycle of nitrogen has been destroyed. Nitrate has many hazards to human health. After nitrate enters the blood, it reacts with hemoglobin to oxidize Fe(II) to Fe(III) to form methemoglobin, which is irreversibly combined with oxygen, causing methemoglobinemia. Can cause hypoxic death. Therefore, the discharge of nitrate-containing sewage in the process of industrial production has aroused widespread concern. In recent years, sewage discharge standards have become increasingly stringent. For example, the effluent standards of the United States, Canada and other countries have TN (total nitrogen content) less than 3mg / L and TP (phosphorus nitrogen content) less than 0.18mg / L, so it ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F3/28C02F101/16
CPCC02F3/28C02F3/2866C02F1/66C02F9/00C02F2305/06C02F2101/163C02F1/001C02F2201/002C02F2303/16C02F2303/14
Inventor 程学文王珺张宾莫馗李海龙高凤霞侯秀华
Owner CHINA PETROLEUM & CHEM CORP
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