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Deodorization of municipal sewage
INDUSTRY OVERVIEW
Petrochemical wastewater exhaust gas treatment
Municipal sewage treatment plant is to deal with urban residents living sewage, institutions, schools, hospitals, commercial services and a variety of public facilities drainage, as well as permitted to be discharged into the urban sewage collection system of industrial wastewater and initial rainwater and other wastewater, along with the development of China's economy, the deterioration of the environment, the shortage of water resources and environmental protection requirements of the increasingly stringent, the city's wastewater collection and treatment rate continues to increase the municipal wastewater treatment industry is also developing very rapidly.
SOURCES OF EXHAUST GASES
Solvent extraction
Adsorption
Organisms
Membrane separation
Oxidisation
Incinerators
EXHAUST GAS COMPOSITION
H₂S
NH₃
Dimethyl disulfide
Sulphur-containing compounds
Diamine
Trimethylamine
Methyl mercaptan
Methyl sulphide
Thiols
Styrene
Acetaldehyde
Propionaldehyde
Butyraldehyde
Aromatic hydrocarbons
Aromatic compounds
Amines
Hydrocarbons
Lipids
Phenols
Alcohols
Aldehydes
Ketones
Volatile Organic Compounds VOCs
Sulphur ethers
Phthalamines
Methyl mercaptan
Dimethyl sulphide
Dimethyl disulfide
Methyl ammonia
Dimethyl ammonia
The main odour components are: H2S, NH3, amines, mercaptans, organic sulphides and other trace organic components. Mainly generated in the sewage pumping station, inlet grating, aeration and sand sedimentation tank, sludge treatment facilities and sludge treatment process of sludge thickening, dewatering and drying, transfer, hot drying, composting and so on.
EMISSION STANDARDS
|
Number
|
Control project
|
Exhaust pipe height(m)
|
Draft for soliciting opinions allows for emission rates (kg/h)
|
Emission release rate of version 93(kg/h)
|
Check location
|
|
1
|
NH3
|
15
|
0.6
|
4.9
|
Workshop or production facility exhaust pipe
|
|
2
|
C3H9N
|
15
|
0.15
|
0.54
|
|
|
3
|
H2S
|
15
|
0.06
|
0.33
|
|
|
4
|
CH3SH
|
15
|
0.006
|
0.04
|
|
|
5
|
(CH3)2S
|
15
|
0.06
|
0.33
|
|
|
6
|
C2H6S2
|
15
|
0.15
|
0.43
|
|
|
7
|
CS2
|
15
|
1.5
|
1.5
|
|
|
8
|
C8H8
|
15
|
3.0
|
6.5
|
|
|
9
|
Odor concentration
|
Exhaust pipe height (m) ≥ 15
|
Standard value (dimensionless) 1000
|
Standard value (dimensionless) 2000
|
TREATMENT CHALLENGES
More sources of odour gas pollution
The presence of malodorous gases emanating from all or localised areas of sewage or sludge from a municipal wastewater treatment plant.
Excessive exhaust air volume
The volume of municipal wastewater is large and is collected in larger quantities, which places high demands on the treatment facility.
Unstable concentration of exhaust gases
The high seasonal correlation between the concentration of pollutants in the odorous exhaust increases the difficulty of treatment.
High variability of odour gas generation
The odour generated by each unit of a municipal wastewater plant also varies with water quantity, water quality, climatic conditions, operating parameters and other factors.
PROCESS FLOW
ECLEAR ADVANTAGES
Strength guarantee
More than 20 waste gas treatment technologies developed by the Sino British joint venture team of a national high-tech enterprise
Quality assurance
200+ project cases of stable operation without worrying about advantages
After-sales service
Free 24-hour online service with after-sales team
Technical Team
Team members have more than ten years of experience in waste gas management, including three registered HVAC engineers registered drainage engineers, two builders
Sourcing company
Cost-effective equipment engineering for better control of your costs
Environmental compliance
Full process management services make it easy for you to cope with the environmental protection bureau acceptance of meeting the new exhaust emission standards
Eclear Environmental RELATED EQUIPMENT
Spray tower
Spray tower, as a type of environmental waste gas treatment equipment, exists. According to its working principle, it can be divided into circulating water spray tower, alkali spray tower, and acid spray tower (also known as acid washing tower). According to the material of the tower, it is divided into fiberglass spray towers, PP spray towers, and stainless steel spray towers. Choose a reasonable spray material and spray process based on the different properties of the exhaust gas. Spray tower is an important industrial waste gas treatment equipment, whose working principle is to use water and power technology to spray liquid or gas in a mist form into the waste gas, in order to remove harmful substances in the waste gas.
Washing tower
Washing tower is a mature waste gas treatment equipment widely used in pre-treatment of industrial waste gas treatment, dust removal, and other aspects. Gas enters the tower and fully contacts, adsorbs, and dissolves with the washing liquid inside the tower, achieving purification effect. The design forms of Yi cleaning towers are diverse, and vertical or horizontal structures can be used according to the project application site. The commonly used materials for washing tower equipment include PP, FRP, and stainless steel. PP and FRP are commonly used in chemical absorption towers and have the characteristics of acid resistance, alkali resistance, and corrosion resistance. Stainless steel materials can be used for high-temperature exhaust gas.
VOCs integrated processing equipment
The activated carbon adsorption box (YQA all-in-one machine) is a VOCs waste gas treatment equipment developed by Eclear Environmental through years of research and engineering experience combined with the photocatalyst technology of university research institutions. It adopts a dual process combination of photocatalytic oxidation and activated carbon adsorption, as well as an integrated design concept.
Biological deodorization
Biological deodorization is the process of using effective deodorizing bacteria and a reasonable equipment structure to oxidize and decompose large molecules or structurally complex organic matter into simple inorganic substances such as water and carbon dioxide through differentiation. Eclear Environmental Biological Deodorization has been improved compared to its peers, adopting an integrated process of pre-treatment and deep adsorption of biological treatment to ensure the stability of the intake during the biological treatment stage. At the same time, deep treatment is not configured at the end, which can ensure that the exhaust gas meets the standard emission when the emission concentration exceeds the design emission concentration.
Biological filter
A biological filter is a device that uses effective deodorizing bacteria and a reasonable equipment structure to oxidize and decompose large molecules or structurally complex organic matter into simple inorganic substances such as water and carbon dioxide through differentiation. Eclear Environmental Biological Filter has been improved compared to its peers, adopting an integrated treatment process of pre-treatment and deep adsorption of biological treatment to ensure the stability of the intake during the biological treatment stage. At the same time, deep treatment is not configured at the end, which can ensure that the exhaust gas meets the standard when the emission concentration exceeds the design.
Coupling catalytic all-in-one machine
The equipment adopts a stainless steel fixed pry mounted fully sealed structure, which is easy to install. The interior is coated with stainless steel special anti-corrosion material, which is resistant to acid, alkali and waste gas environments. The equipment has a long service life and is composed of a pre-treatment section, a coupled reaction device, and an array drawer type module. The high-energy particle field generated by the coupling catalytic network of precious metals is irradiated through the ultraviolet band to the coupling synergy effect of independently prepared precious metals and titanium dioxide nanoparticles. VOCs organic waste gas is decomposed into carbon dioxide, water, etc. Other waste gas molecules that have not been completely degraded can be oxidized into water-soluble small molecules and some active free radicals.
Activated carbon adsorption box
Activated carbon adsorption box is an environmentally friendly mechanical product that filters waste gas and adsorbs odors. This equipment is used to clean organic chemical waste gas and spray waste gas with high concentration. Activated carbon has a high-strength adsorption level. When the waste gas is powered by a centrifugal fan, negative pressure enters the adsorption box and then enters the activated carbon adsorption layer, it has a very good adsorption effect on organic solution waste gas.
Coupling catalytic exhaust gas treatment equipment
The equipment adopts a stainless steel fixed pry mounted fully sealed structure, which is easy to install. The interior is coated with stainless steel special anti-corrosion material, which is resistant to acid, alkali and waste gas environments. The equipment has a long service life and is composed of a pre-treatment section, a coupled reaction device, and an array drawer type module. The high-energy particle field generated by the coupling catalytic network of precious metals is irradiated through the ultraviolet band to the coupling synergy effect of independently prepared precious metals and titanium dioxide nanoparticles. VOCs organic waste gas is decomposed into carbon dioxide, water, etc. Other waste gas molecules that have not been completely degraded can be oxidized into water-soluble small molecules and some active free radicals.
