Method and system for treating VOCs gas in sewage treatment plant

A technology for sewage treatment plants and waste water treatment systems, applied in combustion methods, combustion types, incinerators, etc., can solve the problems of high investment and operating costs, and achieve the effects of reducing operating costs, reducing usage, and low operating costs

Inactive Publication Date: 2016-07-13
JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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  • Summary
  • Abstract
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  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The existing technologies all have disadvantages such as high investment and operating costs, separate treatment for each emission source, and no resource utilization of waste.

Method used

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  • Method and system for treating VOCs gas in sewage treatment plant

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The specific process is as figure 1 shown. After mixing the low-concentration VOCs gas produced by the aeration tank, sludge thickening tank and flow sedimentation tank of a sewage treatment plant (the gas volume is 76000Nm 3 / h, the concentration of non-methane total hydrocarbons is 104mg / Nm 3 , calculated as propane) into the rotary adsorption system for concentration to obtain 6000Nm 3 / h high-concentration VOCs gas (non-methane total hydrocarbon concentration is 1310mg / Nm 3 , calculated as propane); then with the 4000Nm generated by the sludge dewatering machine room 3 / h high-concentration VOCs gas (non-methane total hydrocarbon concentration is 3200mg / Nm 3 , calculated as propane) are merged into the combustion and waste heat recovery system. In this case, regenerative combustion is adopted, and the combustion temperature is 600°C.

[0028] The wastewater treatment system has a wastewater treatment capacity of 20.8m 3 / h, 1050Nm after anaerobic treatment 3 ...

Embodiment 2

[0032] The specific process is as figure 1 shown. After mixing the low-concentration VOCs gas produced by the aeration tank, the sludge concentration tank and the flow sedimentation tank of another sewage treatment plant (the gas volume is 98000Nm 3 / h, the concentration of non-methane total hydrocarbons is 135mg / Nm 3 , calculated as propane) into the rotary adsorption system for concentration to obtain 6000Nm 3 / h high-concentration VOCs gas (non-methane total hydrocarbon concentration is 2200mg / Nm 3 , calculated as propane); and then with the 5000Nm generated by the sludge dewatering machine room 3 / h high-concentration VOCs gas (non-methane total hydrocarbon concentration is 2700mg / Nm 3 , calculated as propane) is merged into the combustion and waste heat recovery system. In this case, thermal combustion is adopted, the combustion temperature is 810°C, the residence time is 3.4s, and the air excess coefficient is 23%.

[0033] The wastewater treatment system has a wast...

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Abstract

The invention provides a method and a system for treating a VOCs gas in a sewage treatment plant, and is based on a VOCs gas absorption-desorption system, a combustion and waste heat recycling system and a wastewater treatment system. The method comprises the following specific steps: feeding a low-concentration VOCs gas in the sewage treatment plant through the VOCs gas absorption-desorption system so as to obtain a concentrated VOCs gas; combining the concentrated VOCs gas with a high-concentration VOCs gas and gases output from an anaerobic treatment unit in the sewage treatment plant to be introduced into the combustion and waste heat recycling system; introducing a certain amount of fuel and a waste gas methane generated in the wastewater treatment system so as to sufficiently combust the VOCs gas; after combustion, recycling the heat by using a waste heat boiler, feeding a part of cleaned fume at an outlet to the VOCs gas absorption-desorption system to desorb the low-concentration VOCs gas, and combining the other part of the cleaned fume with tail gases of an absorption-desorption device to be fed into a chimney for discharge.

Description

technical field [0001] The invention belongs to the technical field of environmental protection and relates to a method for processing VOCs gas, in particular to a method for processing VOCs gas in a sewage treatment plant. Background technique [0002] Volatile organic compounds (VOCs) participate in atmospheric photochemical reactions and can form secondary organic aerosols, which may be one of the main sources of smog. Commonly used VOCs treatment methods include recovery technology and destruction technology. Due to the relatively complex components of waste gas discharged from sewage treatment plants and large fluctuations in concentration, the mainstream process uses destruction technology for VOCs treatment. Among them, the combustion method is a traditional organic waste gas treatment technology, and it is also the most widely used practical technology for VOCs treatment. [0003] CN203336608U has proposed low-concentration VOC gas treatment device, comprises blower...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/06
CPCF23G7/065
Inventor 罗静张军黄海马斌斌
Owner JIANGSU NEW CENTURY JIANGNAN ENVIRONMENTAL PROTECTION
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