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Method and device for treating high-concentration organic wastewater and producing methane gas

A technology of organic wastewater and methane gas, applied in organic chemistry, water/sewage treatment, chemical instruments and methods, etc., can solve the problems of unutilized organic substances, bacterial poisoning, and susceptibility to water quality fluctuations, etc., to achieve Realize resource utilization and reduce overall cost

Active Publication Date: 2012-07-18
BEIJING BIOTECHINA ENVIRONMENT CORP
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  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

Although physical and chemical methods are more thorough in treating wastewater, the basic principles of these two types of methods are to decompose and mineralize organic substances, so the organic substances in wastewater cannot be used; biological methods are currently the most widely used methods. There are many wastewater treatment methods. This method has certain advantages economically, but there is a problem of bacterial poisoning, especially for industrial wastewater. This phenomenon is relatively common. Moreover, when industrial wastewater is treated, additional Nutrients are added to maintain the growth of microorganisms, and the treatment process is also easily affected by fluctuations in water quality, and the subsequent treatment of sludge is also a problem

Method used

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  • Method and device for treating high-concentration organic wastewater and producing methane gas
  • Method and device for treating high-concentration organic wastewater and producing methane gas
  • Method and device for treating high-concentration organic wastewater and producing methane gas

Examples

Experimental program
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Effect test

Embodiment 1

[0051] process such as figure 1 Shown, the internal diameter of catalytic reaction tower 4 that the present invention adopts is 110mm, and height is 1200mm, and material is stainless steel, and the inside is lined with titanium material; 6.5L; the carrier is spherical TiO 2 Particles, the particle size is 10-15mm, the catalyst is spherical TiO coated with precious metal Ru 2 The particle size is 5-7 mm, and the coating concentration of Ru is 5%. The specifications and materials of the carbon dioxide absorbing tower 5 are the same as those of the catalytic reaction tower 4, and the inside is filled with 8L of ceramic packing, which is spherical in shape overall and has a particle diameter of 10 mm. Feed pump 2 is a reciprocating piston pump (Wuxi Linjie High Pressure Pump Factory, w3020), with a power of 20kw; heater 3 is an electric heating furnace (Suyi HVAC Equipment Co., Ltd.), with a total power of 15kw; condenser 6 It is a casing condenser, the condensed water goes thr...

Embodiment 2

[0054] The device in Example 1 was used to treat methanol-containing organic industrial wastewater discharged from a methanol plant in an oil field. The wastewater contains 4% to 5% (mass fraction) of methanol, COD cr About 1000mg / L, the pH value is between 6.7 and 7.2. Continuously feed the waste water into the device, control the influent flow rate to 20L / h; the lye flow rate to 2L / h; control the operating temperature to 280°C and the operating pressure to 90kg / cm 2 During the experiment, the effluent and gas samples at the outlet of the gas-liquid separator were collected for analysis. The results show that the TOC concentration of the effluent is about 80mg / L, and the COD cr The concentration is about 200mg / L. The gas flow at the gas outlet of the separator fluctuates around 550NL / h, where CH 4 Concentration is about 82%, CO 2 Concentration is about 8%, H 2 Concentration is about 2%, C 2 h 6 About 5%.

Embodiment 3

[0056] Treatment of alkali slag wastewater from an oil refinery, the initial CODcr concentration of wastewater is 20000mg / l. In the above process flow, two catalytic reaction towers 4 with the same specifications are connected in series, the water flow rate is controlled to be 20L / h, and the lye flow rate is 2L / h; the operating temperature is 280°C, and the operating pressure is 90kg / cm 2 . The analysis results show that the concentration of CODcr in the effluent is only 670mg / L, and the gas flow at the gas outlet of the upper part of the gas-liquid separator 7 fluctuates around 9000NL / h, of which CH 4 Concentration is 88%, CO 2 Concentration is about 8%, H 2 Concentration is about 2%, C 2 h 6 About 2%. It can be seen that after the catalytic reaction, most of the organic matter in the simulated wastewater was converted into methane gas, and a good treatment effect was obtained.

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Abstract

The invention discloses a method and a device for treating high-concentration organic wastewater and producing methane gas. The method provided by the invention comprises the following processing steps: firstly, the organic wastewater is heated and then charged to a catalytic tower, multiple organic substances in the wastewater generate methane gas and carbon dioxide gas after being subjected to catalytic methanation reaction under action of catalyst, temperature and pressure, and active ingredients are selected from at least one kind of ruthenium, palladium, rhodium, platinum, iridium, nickel, cobalt, manganese and cerium, or a compound which is insoluble in water or difficultly soluble in water and is formed by at least one aforementioned metal; and the carbon dioxide gas generated in the reaction is subjected to desorption; finally fluid enters in a gas-liquid separator, gas rich in methane is collected for storage after separation, and a follow-up treating process is performed after liquid is discharged. According to the invention, the method can purify organic substances in the wastewater and can generate the methane gas at the same time to realize the resource utilization of the wastewater, thereby contributing to reduce the overall cost of wastewater treatment.

Description

technical field [0001] The invention relates to a method for treating high-concentration organic wastewater by thermochemical method, which belongs to the technical field of environmental protection. More precisely, it relates to a method and a device for catalytically treating wastewater containing high-concentration organic matter and simultaneously producing methane gas. Background technique [0002] In China, the discharge of waste water in 2009 has reached 60 billion tons, and COD is close to 13 million tons; at the same time, the development of society has increasingly higher requirements for environmental protection. The efficient treatment of wastewater, especially high-concentration organic wastewater, has become the focus of social attention. [0003] The treatment methods of high-concentration organic wastewater mainly include physical and chemical methods, chemical methods, and biological methods. Physicochemical method mainly refers to electrolysis method; chem...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/00C07C9/04C07C1/20
Inventor 李国文苏贞峰郭春生张学辉胡彦龙
Owner BEIJING BIOTECHINA ENVIRONMENT CORP
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