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Treatment method for sewage

A treatment method and technology for wastewater, which can be applied in the directions of oxidized water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc.

Inactive Publication Date: 2007-06-06
云南高科环境保护工程有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

Therefore, in order to cope with the temperature drop caused by the latent heat of evaporation, external heating is required during operation, and at the same time, it becomes difficult to maintain the liquid phase state well and continue the reaction, so the removal rate of fouling components sometimes decreases.
[0004] In addition, when the concentration of dirty components in wastewater is high and the amount of liquid evaporation is large, metal components, metal salts (metal oxides, etc.), carbonates (Na 2 CO 3 etc.), sulfate (Na 2 SO 4 etc.) etc. are concentrated, and the metal components in the wastewater are attached to the carrier and / or the surface of the catalyst, which reduces its activity and cannot be treated well.
[0005] In addition, when the concentration of organic matter (TOC) and / or the total concentration of sulfur compounds in the dirty components in alkaline wastewater are high, in the wet oxidation treatment and / or wet catalytic oxidation treatment system, due to the generation of alkaline salts and sulfur salts Occlusion caused by precipitation, etc., cannot perform good operation

Method used

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Examples

Experimental program
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Effect test

Embodiment 1

[0094] Wastewater (alkaline wastewater containing nitrogen-containing compounds, organic substances, and inorganic substances in high concentrations) generated in petroleum refineries having the properties shown in Table 1 was treated according to the flow shown in FIG. 1 .

[0095] pH

14.5

BOD

12.6g / L

CODcr

275g / L

TOC

100g / L

NH 3 -N

52mg / L

phenol

54g / L

S(SO 4 )

10g / L (30g / L)

CL

5.4g / L

[0096] The CODcr concentration of the raw wastewater is 275g / L, the raw wastewater treatment capacity is 105kg / hr, and the air volume is 125Nm 3 / hr. From the treatment water tank 101, the wet oxidation treatment water and the raw waste water were circulated and mixed at a circulation rate of 347 kg / hr. This circulation amount is equivalent to about 3.3 times of the original wastewater treatment amount.

[0097] The outlet temperature of the wet oxidation reactor 9 is 275° C., and the press...

Embodiment 2

[0107] The waste water (alkaline waste water containing nitrogen-containing compounds, organic matter and inorganic matter in a high concentration) produced in a petroleum refining plant used in Example 1 was diluted so that the CODcr concentration was 100 g / L and the TOC concentration was 36 g / L. L, add ammonia water to the wastewater to make NH 3 -N concentration is 3000mg / L. According to the process shown in Figure 3, the waste water was treated.

[0108] The raw wastewater treatment capacity is 20.8kg / hr, and the air volume is 7.7Nm 3 / hr. With a circulation rate of 31kg / hr, the wet catalytic oxidation treatment water from the treatment water tank is circulated and mixed with the raw wastewater. This circulation amount is equivalent to about 1.5 times of the original wastewater treatment amount. The reaction time is 0.75hr.

[0109] The treated water quality is, CODcr: 100mg / L, TOC: 35mg / L, NH 3 -N: <1 mg / L.

[0110] A spherical catalyst (approximately 5 mm in diame...

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Abstract

The method applies the wet oxidation and / or catalytic wet oxidation to the alkaline water containing at least one kind selected from the group of the nitrogen compound, organic material, and inorganic material in high concentration in a condition of 100 [deg.]C or more and 0.5 MPa or more. The method comprises: a process (1) wherein parts of a liquid phase obtained by separating a gas from a liquid after the treatment corresponding with the CODcr concentration in the alkaline wastewater before the treatment is circulated and mixed with the alkaline wastewater before the treatment; and / or a process (2) wherein an exhaust gas obtained by separating a gas from a liquid after the wet oxidation and / or catalytic wet oxidation is mixed with the alkaline wastewater before the treatment to deposit and separate salts, then the wet oxidation and / or catalytic wet oxidation is subjected to the alkaline wastewater.

Description

technical field [0001] The present invention relates to a method for treating alkaline wastewater (hereinafter simply referred to as "wastewater") containing at least one of nitrogen compounds, organic substances, and inorganic substances (hereinafter simply referred to as "pollution components") in high concentrations. Background technique [0002] Methods of performing wet oxidation treatment and / or wet catalytic oxidation treatment on wastewater containing at least one of nitrogen compounds, organic substances and inorganic substances are known. For example, Patent Document 1 proposed by the present applicant discloses "a method of decomposing ammonia, organic substances, and inorganic substances in wastewater by subjecting wastewater to wet catalytic oxidation in the presence of a supported catalyst". As can be seen from the results shown in the Examples, etc., this method can usually exhibit very excellent wastewater treatment effects. [0003] However, in this method,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F1/72B01J23/00
Inventor 钱彪杨英赵光辉原田吉明山崎健一東隆行
Owner 云南高科环境保护工程有限公司
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