The interest in global environmental preservation issues such as global warming due to greenhouse gases is increasing. Aiming to achieve harmony between energy and environment, Chiyoda has been offering environmental preservation technologies since its foundation. In addition to offering licensed technologies, Chiyoda has been active in developing its own technologies in the fields of air pollution control and wastewater treatment, and has delivered these technologies to various clients as environmental pollution control technologies. Continuing in this spirit, Chiyoda is developing new technologies and improving existing technologies.

Chiyoda’s own environmental technologies

Flue Gas Treatment Technology (Flue Gas Desulfurization and Denitration Technologies)

Flue gas desulfurization and denitration technologies are environmental technologies for removing sulfur oxide (SOx) and nitrogen oxide (NOx) from flue gases resulting from fossil fuel combustion.

CHIYODA THOROUGHBRED 121 (CT-121) Flue Gas Desulfurization

Chiyoda has so far constructed many flue gas desulfurization plants for large-scale coal-fired power plants. In Japan, Chiyoda offers EPC (Engineering, Procurement, and Construction) services, and in overseas countries, licenses the technology to local licensees.

Wastewater Treatment Technology

Wastewater treatment systems are comprehensive systems that logically combine various components to remove impurities, such as oil, organic matter, and minerals from wastewater and achieve the required water quality. In recent years, more and more wastewater treatment systems reuse treated wastewater to compensate for the shortage of water. Chiyoda has been engaged in the design and construction of industrial water treatment facilities for various plants and wastewater treatment facilities for many years. Chiyoda has so far constructed a few hundred of facilities in Japan and in overseas countries, contributing to global environmental preservation.


Biofiner® is a aerobic fixed-bed biological treatment system that is characterized by its cylindrical nonwoven fabric floating carrier (Biofiner® carrier) with an excellent microorganism retention property.

Global warming prevention

To help prevent global warming, we provide solutions that reduce atmospheric emissions of CO2 with our engineering of the total carbon chain.

Clean Coal Technology related to Coal Gasification

Chiyoda offers plant technology to maximize coal use efficiency and minimize environmental impact in various plants that use coal-gasified synthetic gases.

CO2 Capture and Storage (CCS) from Flue Gas

CCS (Carbon dioxide Capture and Storage) technology plays a key role in using coal in an environmentally-friendly manner.