+86 15853145085
I. General Provisions
1. Core Objectives
Based on the principles of compliant discharge, high efficiency and controllable secondary pollution, this scheme designs targeted technologies for different odor waste gas. The concentration of hydrogen sulfide, ammonia, VOCs and other odor substances shall meet national and local emission standards (e.g., iron and steel ultra-low emission standard: particulate matter ≤10mg/m³, SO₂ ≤35mg/m³), while reducing operating cost and ensuring stable equipment operation.
2. Application Scope
This scheme applies to odor pollution sources such as chemical industry, pharmaceutical industry, rubber industry, garbage treatment, sewage treatment and livestock breeding. It is suitable for various working conditions of different waste gas concentration and air volume.
II. Waste Gas Characteristics and Pretreatment System
1. Waste Gas Characteristic Analysis
Pollution Source | Main Odor Components | Typical Concentration Range | Air Volume Characteristic |
Chemical Enterprises | VOCs, Hydrogen Sulfide, Mercaptan | 100-1000mg/m³ | Medium and low air volume |
Sewage Treatment Plant | Ammonia, Hydrogen Sulfide, Indole | 50-500mg/m³ | Large air volume |
Landfill Site | Methane, Ammonia, VOCs | 200-800mg/m³ | Ultra-large air volume |
Livestock Farm | Ammonia, Hydrogen Sulfide, Skatole | 150-600mg/m³ | Medium and large air volume |
2. Key Pretreatment Process
(1) Dust Removal
Bag dust collector or cyclone dust collector is used to remove particles ≥10μm to prevent equipment blockage and catalyst poisoning.
(2) Humidification and Cooling
A spray tower controls the humidity at 40%-60% and temperature at 20-40℃. Weak alkaline solution is used to absorb acidic odor substances.
(3) Gas-Liquid Separation
A demister reduces gas moisture to ≤80% to avoid equipment corrosion.
III. Technology Selection and Application Scheme
1. Technology Comparison
Technology | Core Principle | Efficiency | Investment Cost (10,000 Yuan / 10,000Nm³) | Annual Operating Cost | Application Scenario |
Activated Carbon Adsorption | Physical adsorption and surface oxidation | 80%-90% | 5-42 | 40-80 | Low-concentration VOCs, intermittent emission |
Chemical Absorption | Acid-base chemical reaction | 90%-95% | 12-47 | 50-97 | High-concentration hydrogen sulfide and ammonia |
Biological Treatment | Microbial degradation into CO₂ and H₂O | 75%-90% | 10-40 | 6-12 | Medium and low concentration biodegradable waste gas |
RCO | Catalytic combustion and heat recovery | 95%-99% | 40-100 | 4-8 | Medium and high concentration organic waste gas |
Photocatalytic Oxidation | UV excites TiO₂ to produce hydroxyl radicals | 90%-98% | 20-50 | 8-15 | Low-concentration and large-air-volume VOCs |
2. Industry Customized Scheme
(1) Sewage Treatment Plant
Process: Waste gas collection → Cyclone dust removal → Spray cooling → Chemical scrubbing → Biological trickling filter → Online monitoring discharge
Design: Porous ceramsite is used as filter material. Gas velocity: 0.5-1.0m/s; residence time ≥30s; liquid-gas ratio: 3-5L/m³.
Effect: H₂S removal rate ≥95%, NH₃ removal rate ≥90%, complying with GB 18918-2002.
(2) Chemical Enterprise
Process: Waste gas collection → Bag dust removal → Activated carbon adsorption → Hot air desorption → RCO → Heat recovery
Design: Honeycomb activated carbon, desorption temperature 120-150℃. Pt-Pd catalyst, reaction temperature 300-400℃.
Effect: VOCs removal rate ≥98%, heat recovery efficiency ≥85%, complying with GB 31571-2015.
(3) Landfill Site
Process: Waste gas collection → Spray pretreatment → RTO (800℃) → Hydroxyl oxidation tower → High-altitude discharge
Design: Three-chamber RTO, thermal efficiency ≥95%. Hydroxyl radical is generated to degrade residual odor.
Effect: Total hydrocarbon removal rate ≥99%, odor intensity below Grade 1, complying with GB 14554-93.
IV. Supporting System and Intelligent Control
1. Auxiliary Equipment
Gas collection: Umbrella hood or closed hood, wind speed 1-3m/s; pipeline speed 10-15m/s, air leakage ≤5%.
Fan: FRP anti-corrosion fan with 10%-15% pressure allowance.
Exhaust stack: Height ≥15m, equipped with rainproof cap and monitoring interface.
2. Intelligent Control System
PLC + touch screen, one-key start-stop and frequency conversion adjustment. Temperature, concentration and pressure sensors are equipped. Emergency valve will be opened under abnormal temperature or concentration. Real-time data is uploaded to environmental monitoring platform.
V. Cost Analysis and Operation Maintenance
1. Life Cycle Cost
Cost Type | Proportion | Control Measures |
Equipment Investment | 40%-60% | Adopt mature technology to avoid over-design |
Energy Consumption | 20%-30% | Frequency conversion fan and heat recovery system |
Consumable Replacement | 10%-15% | Long-life activated carbon and catalyst |
Labor Cost | 5%-10% | Intelligent monitoring to reduce manual inspection |
2. Maintenance Specification
Daily inspection: Fan operation and spray liquid pH. Weekly cleaning: Dust hopper and filter material.
Regular replacement: Activated carbon every 6-12 months; catalyst every 2-3 years; biological filter material every 3-5 years.
Emergency plan: Equipped with standby fan and adsorption tower to ensure temporary standard discharge.
VI. Compliance and Acceptance Standard
Emission indicators shall comply with industrial standards and local policies. If no industrial standard is available, GB 14554-93 shall be adopted.
A third-party organization shall conduct 72-hour continuous monitoring after construction. All documents shall be filed to the ecological environment department.
