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Shanghai Lanbao Environmental Protection Technology Co., Ltd
How to deal with the challenges of abnormal working conditions for odor exhaust gas treatment equipment
Date: 2025-12-16Read: 3
With increasingly strict environmental regulations, the treatment of odorous waste gas has become a necessity in industries such as sewage treatment plants, kitchen waste treatment stations, livestock and poultry farms, and food processing plants. However, the exhaust gases emitted from these places often have typical characteristics of low temperature, high humidity, and high dust (referred to as "three highs"), which pose serious challenges to conventional treatment equipment. For example, in winter, the exhaust temperature of sewage treatment plants in northern regions often drops below 5 ℃, leading to a sharp decline in microbial activity in biological methods; The relative humidity of the exhaust gas in the kitchen waste sorting workshop is close to saturation (>95%), which can easily cause packing plate or filter blockage.
Customers are generally concerned: "My working conditions are so harsh, can the odor exhaust gas treatment equipment on the market still be used?" This article will systematically analyze the adaptability of mainstream technologies in the "three highs" environment and propose targeted optimization solutions.
The impact of the "three high" working conditions on mainstream treatment processes
1. Biological method: Low temperature is a major bottleneck
The biological filter/drip filter tower relies on microorganisms to degrade odorous substances such as hydrogen sulfide and ammonia, but its suitable temperature is 20-35 ℃. When the temperature is below 10 ℃, the metabolic rate of the microbial community significantly decreases; When the temperature is below 5 ℃, the processing efficiency may decrease by more than 50%. In addition, although high humidity is beneficial for microbial growth, if accompanied by high dust (such as sludge drying waste gas), the dust will cover the surface of the packing material, block gas-liquid mass transfer, and cause "biofilm suffocation".
Typical case: The odor removal rate of a municipal sewage plant in northern China decreased from 90% in summer to 60% in winter, leading to a surge in resident complaints.
2. Chemical washing method: high humidity has little impact, but high dust is prone to clogging
The combination of alkaline washing and sodium hypochlorite oxidation can efficiently remove H ₂ S and NH ∝, and is insensitive to humidity. But if the exhaust gas contains a large amount of particulate matter (such as garbage crushing dust), the nozzle and packing layer are prone to scaling and blockage, requiring frequent cleaning and increasing the burden of operation and maintenance.
3. UV photolysis/plasma: high humidity reduces reaction efficiency
In high humidity environments, water molecules compete to absorb ultraviolet light or consume plasma energy, resulting in a decrease in free radical yield and a decrease in odor decomposition efficiency. Meanwhile, condensation of water vapor may corrode electrodes or optical components.
4. Activated carbon adsorption: high humidity severely weakens adsorption capacity
Activated carbon has good adsorption properties for organic odorants, but when the relative humidity is greater than 70%, water molecules preferentially occupy the micropores, reducing the effective adsorption capacity by 30% -60% and increasing the difficulty of regeneration.
2、 Targeted solutions and technological optimization
In the face of the "three highs" challenge, a single process is no longer competent, and a combination strategy of pretreatment, core process, and intelligent control is needed to achieve stable compliance.
1. Strengthen preprocessing: solve the problem of high humidity and high dust
Cyclone dust collector+demister: first remove large particles of dust and droplets to protect subsequent equipment.
Condensation dehumidification/temperature rise dehumidification: The exhaust gas temperature is raised above the dew point through a heat exchanger, or the humidity is reduced to below 70% using rotary dehumidification.
Automatic Backblowing System: Set up differential pressure monitoring for the filtration unit, automatically start compressed air blowback, and prevent blockage.
2. Process combination: leverage strengths and avoid weaknesses to enhance stability
Note: For extremely cold regions, an insulation layer can be installed outside the biological filter, or some hot air can be introduced to mix and heat up.
3. Intelligent operation and maintenance: reduce manual intervention
Install online sensors for temperature, humidity, pressure difference, and odor concentration;
Set up automatic adjustment logic (such as starting dehumidification when humidity exceeds the standard, triggering blowback when pressure difference increases);
Support remote monitoring and fault warning, reducing the frequency of on-site inspections.
3、 Customer purchasing suggestions
When selecting odor exhaust gas treatment equipment, enterprises should focus on whether the supplier has:
Diagnostic ability for working conditions: Can you provide measured data on exhaust gas composition, temperature and humidity, and dust concentration?
Customized design experience: Are there any successful cases of similar "three highs" projects?
Full lifecycle services: Do you provide an integrated solution for pre-processing, core equipment, and operation and maintenance hosting?
Do not blindly pursue low prices or a single technology, but focus on the core goal of "stable compliance and low operation and maintenance costs".
4、 Conclusion
Through scientific pretreatment, rational process combination, and intelligent control, even under harsh conditions of low temperature, high humidity, and high dust, odor exhaust gas treatment equipment can still achieve efficient, stable, and compliant operation. The key is to adapt to the situation and reject a one size fits all approach.