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Solution For the Earth DYC

Air Pollution Field

Introduction of air pollution prevention technology

Increasing necessity of developing technology for removing air pollutants (NOx, SOx) using chlorine dioxide
- Technology background
Enhancement
of air pollutant regulations 		Enhancement of emissio
standards		 Increased nitrogen and sulfur
oxides (NOx, SOx) emissions		 Increasing need for
pollutant treatment technology development
With increasing interest in environmental issues,
regulations on air pollutants are being strengthened at the country and abroad		 The Ministry of Environment reinforced air emission standards
for major air pollutants such as nitrogen and sulfur oxides, dust in 2010		 85% of the energy used
on the planet are fossil fuels that emit nitrogen and yellow dust,
and are mainly used in thermal power plants, steel plants and incinerators. It is responsible for respiratory diseases, photochemical smog, and acid rain.		 simultaneous removal technology for nitrogen oxides and sulfur oxides with different characteristics.
☞ It is judged that the development of efficient low-cost and eco-friendly treatment technology for exhaust gas is a national urgent task.
- Expected effect
  • This technology uses chlorine dioxide to efficiently remove pollutant combustion gases such as nitrogen oxides and sulfur oxides generated in various incineration facilities compared to existing treatment technologies.
  • When using chlorine dioxide compared to existing treatment facilities (i) Efficiency improvement (ii) Reduction in processing costs (iii) Expected to reduce toxic by-products and wastewater after treatme
Differentiation of technology for removing air pollutants (NOx, SOx) using chlorine dioxide
  • The need for a mechanism using chlorine dioxide that can simultaneously remove nitrogen oxides and sulfur oxides and recycle existing treatment facilities has emerged, as the existing treatment technology incurs excessive equipment costs or poor treatment efficiency.
Existing treatment technology Mechanism to reduce
fine dust using
chlorine dioxide Mechanism
Selective catalytic reduction method Wet scrubbing method Activated carbon adsorption method
Operation cost is low,
but equipment cost is excessive. In addition, there is a disadvantage of generating particulate matter and high temperature (300~400℃) treatment.		 Various applications are advantageous, but multi-step treatment and generated large amounts of liquid waste are disadvantages Facility cost is low, but treatment efficiency is low (60 ~ 70%). In addition, only a small amount of combustion gas can be treated, and large-capacity waste combustion gas cannot be treated. Equipment cost is very low due to
rapid oxidation reaction, and its treatment efficiency is higher than that of the existing method.
So it can be applied in a variety of ways.
No by-products such as metal
or gas are generated, and wastewater is reduce

System introduction

Scrubbing system applying chlorine dioxide
- Expected 90% removal efficiency
Div. NO SO2
Incoming concentration (ppm) 400 200
After the first dry
treatment (ppm)		 80 40
Removal rate (%) 80% 80%
After the 2nd
wet treatment (ppm)		 40 20
Removal rate (%) 90% 90%
Total removal rate (%) 90% 90%

Previous research results

Scrubbing system applying chlorine dioxide
  • Using chlorine dioxide, the efficiency of removing substances causing odor was verified, and the removal efficiency was over 90% as a result of the test.