Product
Product Overview / Odor technical diagnosis
Odor technical diagnosis
1. Odor technical diagnosis
Multi-stage Deodorization Technology -Our odor control facilities are designed as multi-stage deodorization systems that remove complex odors step by step.
At each treatment stage, we apply optimized chemicals and process technologies to achieve a hydrogen sulfide removal rate of over 99.9%.
(Certified Technology No. Gwangju–Jeonnam-20180401-4-01)
- Step 1 : Removal of fine dust and particulate matter in odorous gas
- Step 2 : Oxidation and decomposition of odorous gas using the strong oxidizing power of ozonated water (reduces chemical consumption and load in downstream processes)
- Step 3 : Removal of more than 99.9% of hydrogen sulfide using an iron-chelate chemical solution
- Step 4 : Removal of acidic, neutral, and alkaline odors using chemical scrubbing process with sulfuric acid, sodium hypochlorite, and caustic soda (method exempted under the Chemicals Control Act)
- Step 5 : Removal of residual chemical odor using low-temperature water scrubbing
Jumunjin Agro-Industrial Complex Terminal Wastewater Treatment Plant (670 m³/min)
Osan Environmental Center (700 m³/min)
Jeju Environmental Facilities Management Center – Leachate and Food Waste Pressate Pretreatment Facility (200 m³/min)
Multi-stage Deodorization Technology
(Certified Technology No. Gwangju–Jeonnam-20180401-4-01)
- Removes complex odors to below regulatory limits through a total of three-step, four-stage treatment
- Step 1 : Uses ozonated water (O₃ water) to remove dust and odorous aromatic compounds
- Step 2 : Removes over 99% of hydrogen sulfide, which accounts for 80–90% of complex odors
- Step 3 : Treats remaining odors by chemical scrubbing with suitable scrubbing solutions
- Can be customized and selectively applied according to odor generation conditions at each site
Yongin Respia (500 m³/min)
Ulsan Bangojin No. 2 Wastewater Treatment Plant (180 m³/min)
Capital area Landfill Site 50 MW Landfill Gas Power Plant (450 m³/min)
System Configuration of Multi-stage Deodorization Technology
• Medium/Low-concentration Deodorization
• High-concentration Deodorization
– Arrangement can be adjusted according to gas characteristics.
1st stage 2 or 3-stage deodorizer
(Iron-chelate chemical solution + sodium hypochlorite or caustic soda)
2nd stage 3 or 5-stage deodorizer
(Iron-chelate chemical solution + sodium hypochlorite + caustic soda)
3rd stage 4-stage deodorizer
(Ozonated water + iron-chelate chemical solution + sodium hypochlorite + caustic soda)
(For high-concentration sulfur compound odors)
3rd stage 6-stage deodorizer
(Sulfuric acid + iron-chelate chemical solution + ozonated water + sodium hypochlorite + caustic soda + water scrubbing)
(For high-concentration complex odors)
Multi Deodorization Technology
- Removes complex odors to below regulatory limits through a three-step, three-stage deodorization process
- Step 1: Removes more than 99% of hydrogen sulfide, which constitutes the majority of complex odors
- Step 2 : Removes acidic and alkaline odors using a two-step chemical scrubbing process
- Step 3 : Removes residual odors and some VOCs using a biofilter before discharge to the atmosphere
- Can be customized and selectively applied according to odor generation conditions at each site
Ulsan Bangojin Sewage Treatment Facility (500 m³/min)
Hamyang Livestock Manure Public Treatment Facility (750 m³/min)
Jumunjin Sewage Treatment Facility (190 m³/min)
2. Key Features of the Technology
Principle of the Iron-Chelate Solution
Core Chemical Reactions
Principle of the Iron-Chelate Solution
- Removes high concentrations of hydrogen sulfide through its solubility in the scrubbing solution and redox reactions with the iron-chelate catalyst
- Generates no wastewater or secondary pollutants
- The catalyst is continuously regenerated by oxygen (O₂) in the air and circulates in a closed loop, allowing semi-permanent use.
- Regeneration and reuse of the catalyst result in low operation and maintenance (O&M) costs.
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Mechanism of hydrogen sulfide removal
H₂S(g) → H₂S(aq)
H₂S(aq) + 2Fe³⁺–chelateⁿ⁻ → 2Fe²⁺–chelateⁿ⁻ + S⁰↓ + 2H⁺ -
Catalyst regeneration
O₂(g) → O₂(aq)
4Fe²⁺–chelateⁿ⁻ + 2H₂O + O₂(aq) → 4Fe³⁺–chelateⁿ⁻ + 4OH⁻
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category
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Our Technology (multi-stage Deodorizer)
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Conventional Technology – Chemical Scrubbing (2–3 stage)
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Conventional Technology – Chemical Scrubbing + Biofilter
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reaction phase
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Liquid phase
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Sulfur compound removal reagent
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Iron-chelate solution scrubbing
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NaOH, NaOCl
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NaOH, NaOCl
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Acidic / alkaline odor removal reagents
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Iron-chelate solution, NaOCl, NaOH
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HCl, H₂SO₄
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HCl, H₂SO₄
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Neutral / residual odor
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H₂SO₄, BIO
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None (neutral odors and VOCs cannot be removed)
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BIO
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Reagent lifetime
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Reused after regeneration (fresh chemical consumption only about 10–20% per year)
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Periodic consumption and replacement required
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Periodic consumption and replacement required
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Regeneration cost
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Low (power cost for air injection)
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Not regenerable
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Not regenerable
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Reagent regeneration rate
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80~90%/Year
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0 %/Year
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0 %/Year
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Secondary pollutants
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None
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Large volumes of wastewater generated
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Large volumes of wastewater generated
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Applicable concentration range
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High to low (removes up to approx. 99% of odor concentration)
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High to low (removes up to approx. 99% of odor concentration)
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Medium (similar to 2-3 stage chemical scrubbing)
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features
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• removes >99% of hydrogen sulfide (H₂S) using a regenerable iron-chelate scrubbing solution, while minimizing mist entrainment (droplet carryover).
• The iron-chelate scrubbing solution is regenerated using oxygen in ambient air. • Reduces the load on downstream treatment processes after hydrogen sulfide removal. |
• Removes hydrogen sulfide by contacting NaOH aqueous solution with the gas in a scrubber.
• Hydrogen sulfide removal efficiency can be adjusted by changing the NaOH concentration. |
• Performs primary treatment of hydrogen sulfide with chemical scrubbing.
• Treats remaining odors in a downstream biological process. |
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advantages
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•Regenerable reagents enable semi-permanent use.
•Lower operation and maintenance costs compared with other technologies. •Maintains hydrogen sulfide removal efficiency of 99% or higher. •Removal efficiency is stable even when inlet hydrogen sulfide concentration fluctuates. •No secondary pollutants are generated. |
•Relatively simple removal process.
•Removal efficiency can be increased by raising NaOH concentration. •Accumulated know-how with long-term use of this method. |
•Equipment fabrication and installation are simple.
•Advantageous for low-concentration hydrogen sulfide removal. •Simple removal mechanism. •Operation is relatively simple compared with other technologies. |
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disadvantages
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•Requires annual make-up of approximately 10–20% to compensate for filter losses and natural evaporation.
•Power cost is incurred for air injection during regeneration. |
•Very high chemical consumption cost to achieve higher removal efficiency.
•No regeneration; reagents must be discarded after use. •Wastewater treatment costs are incurred. •Handling of strong chemicals involves safety risks. |
•No reagent regeneration, resulting in higher operating costs.
•Low hydrogen sulfide removal efficiency can lead to biofilter microorganism die-off and internal corrosion due to pH. •Frequent reseeding of microorganisms is required. |
3-1. case study : odor control system improvement – Jumunjin, Gangneung
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location
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improvement summary
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previous process
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case image
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process after improvement
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Jumunjin Agro-Industrial Complex, Gangneung (670 m³/min)
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The existing system using sodium hydroxide and sodium hypochlorite solutions failed to adequately treat high-concentration odorous compounds, resulting in exceedance of the required performance criteria. After applying our proprietary process, the facility now fully meets the applicable performance standards.
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Sodium hydroxide ↓ Sodium hypochlorite
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Water wash → Iron chelate solution → Sodium hydroxide → Sodium hypochlorite
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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14,422
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120
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3-2. Case Study : Odor Control System Improvement – Jeju Food Waste Facility
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location
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improvement summary
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previous process
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case image
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process after improvement
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Leachate and food waste liquor pretreatment facility, Jeju Environmental Facilities Management Office (200 m³/min)
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The existing process using sodium hypochlorite and a biofilter failed to adequately treat high-concentration odorous compounds, resulting in exceedance of the required performance criteria. After applying our proprietary process, the facility now fully meets the applicable performance standards.
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Sodium hypochlorite ↓ Biofilter
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Sulfuric acid → Iron chelate solution → Ozonated water → Sodium hypochlorite → Sodium hydroxide
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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100,000
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300
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3-3. case study : odor control system improvement – capital area landfill site
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location
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improvement summary
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previous process
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case image
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process after improvement
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50MW landfill gas power plant at capital area landfill site
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The existing system using sodium hydroxide and sodium hypochlorite solutions failed to adequately treat high-concentration odorous compounds, resulting in exceedance of the required performance criteria. After applying our proprietary process, the facility now fully meets the applicable performance standards.
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Sodium hydroxide ↓ Sodium hypochlorite
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water wash → iron chelate solution → sodium hydroxide → sodium hypochlorite
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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1,000
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100
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3-4. case study : odor control system improvement - Yeongdeok Respia Sewage Treatment Plant, Yongin
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location
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previous process
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improvement summary
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previous process
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case image
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process after improvement
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|---|---|---|---|---|---|
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Yeongdeok Respia Sewage Treatment Plant, Yongin
(300m³/min)
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new installation
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Following a technical review of alternative processes, our proprietary process was selected and is currently operating with emissions maintained below the required performance standards.
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Sodium hydroxide → Sodium hypochlorite
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water wash → iron chelate solution → sodium hydroxide → sodium hypochlorite
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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3,000
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208
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3-5. case study : odor control system improvement - Respia Sewage Treatment Plant, Yongin
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location
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improvement summary
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previous process
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case image
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process after improvement
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|---|---|---|---|---|
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Respia Sewage Treatment Plant, Yongin
(500m³/min)
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The existing process using sodium hypochlorite and sodium hydroxide solutions failed to adequately treat high-concentration odorous compounds, resulting in exceedance of the required performance criteria. After applying our proprietary process, the facility now fully meets the applicable performance standards.
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Sodium hydroxide → Sodium hypochlorite
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water wash → iron chelate solution → sodium hydroxide → sodium hypochlorite
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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44,814
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208
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3-6. case study : odor control system improvement – Gangneung wastewater treatment plant
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location
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improvement summary
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previous process
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case image
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process after improvement
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|---|---|---|---|---|
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Gangneung wastewater treatment plant
(100, 200, 350, 650 m³/min)
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The existing system treated odors by routing aeration air from the biological reactor to a biofilter, but it failed to adequately remove high-concentration odorous compounds, resulting in exceedance of the required performance criteria. After applying our proprietary process, the facility now fully meets the applicable performance standards.
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Aeration air from biological reactor, biofilter
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ron chelate solution → sodium hydroxide → sodium hypochlorite
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improvement results
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parameter
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inlet concentration
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outlet concentration
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|---|---|---|
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complex odors
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4,481
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≤ 300
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4. Economic Feasibility Comparison
high-concentration odor removal -high-concentration odor condition : complex odor 5,000 or more, deodorization airflow : 500CMM, inlet hydrogen sulfide : 50ppm
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category
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Our multi-stage deodorization process
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Three-stage chemical scrubber system
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Two-stage chemical scrubbers + biofilter
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|---|---|---|---|
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facility configuration
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Iron chelate solution+NaOH+NaOCl(H₂SO₄ )
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NaOH+H₂SO₄+NaOCl
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NaOH+H₂SO₄+NaOCl+ Biofilter
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facility cost
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equipment cost
KRW600,000,000 |
equipment cost
KRW600,000,000 |
equipment cost
KRW550,000,000 |
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operation & management cost
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KRW133,120,800 / year
relative index 1.0
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KRW133,120,800 / year
1.7
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KRW217,983,520 / year
1.6
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* relative index of our multi-stage deodorization process = 1.0
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basis of cost calculation
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description
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Our multi-stage deodorization process
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Three-stage chemical scrubber system
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Two-stage chemical scrubbers + biofilter
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|---|---|---|---|
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annual operation & management cost
(KRW/year)
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power cost
-annual electricity cost = 95 kW × 24 hr/day × 365 days/year × 0.8 (operating factor) × KRW 80/kWh = KRW53,260,800/year -chemical cost (iron chelate make-up solution + sodium hydroxide + sodium hypochlorite) = 21,200,000 + 36,000,000 + 22,000,000 = KRW79,200,000won/year -comsumable replacement cost(pall rings and filter cloth) = KRW660,000/year (replacement once every three years) |
power cost
-annual electricity cost = 90 kW × 24 hr/day × 365 days/year × 0.8 (operating factor) × KRW 80/kWh = KRW50,457,600/year -chemical cost (NaOH+H₂SO₄+NaOCl) = 91,050,000 + 54,112,000 + 25,440,000 = KRW170,602,000/year -comsumable replacement cost(pall rings and filter cloth) = KRW660,000/year (replacement once every three years) |
power cost
-annual electricity cost = 93 kW × 24 hr/day × 365 days/year × 0.8 (operating factor) × KRW 80/kWh = KRW52,139,520/year -chemical cost (NaOH+H₂SO₄+microbial cultures, nutrient, etc.) =91,050,000 + 54,112,000 + 18,682,000 = KRW163,844,000/year -comsumable replacement cost(pall rings and biofilter media) =KRW2,000,000원 |
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total
KRW 133,120,800/year
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total
KRW 133,120,800 / year
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total
KRW 133,120,800 / year
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Jumunjin Agro-Industrial Complex Final Wastewater Treatment Plant (670 m³/min)
Grit chamber at Gangneung Public Wastewater Treatment Plant (350 m³/min)
