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Recently, the Fourth Session of the 14th National People’s Congress passed the Environmental Ecology Code of the People’s Republic of China. This law, regarded as \"the strictest environmental protection code in history\", will come into force officially on August 15, 2026. As China’s second law to bear the title of “code,” it is not only a milestone in the field of ecological environment but also brings new challenges and opportunities to the coking industry, which is characterized by high pollution and high emissions. Among these, desulfurization, as a key aspect in the prevention and control of air pollution in the coking industry, is mentioned multiple times in the code, becoming a compliance requirement that companies must pay attention to. The code sets three key requirements for desulfurization in the coking industry. No. 1: The installation of desulfurization equipment is mandatory to ensure compliance. Article 1,114(3) of the code states that enterprises in industries such as steel, building materials, non-ferrous metals, petroleum, and chemicals, which emit dust, sulfides, and nitrogen oxides during production, must either install equipment for dust removal, desulfurization, and denitrification or take other measures such as technical upgrades to control the emission of air pollutants. The energy regulatory authority shall order corrections and impose a fine of not less than 100,000 yuan but not more than 1 million yuan ； If they refuse to make corrections, with the approval of the people’s government vested with the authority to grant such approval, they shall be ordered to suspend operations or close down. As a key polluting industry, the coking sector generates large amounts of sulfur-containing waste gas during production; therefore, it has become a legal requirement to install desulfurization equipment. This means that both new coking projects and existing enterprises must incorporate desulfurization facilities into their production systems in order to reduce sulfur compound emissions at the source. NO.2 Encourage ultra-low emission technologies to promote substantial emission reductions. Article 212 of the Code stipulates that **it is necessary to encourage and support key industries such as steel, cement, and coking, as well as coal-fired boilers, in adopting ultra-low emission technologies in order to reduce the emission of air pollutants. Ultra-low emission technology is the current development direction for desulfurization in the coking industry, as it enables the emission concentrations of pollutants such as sulfur dioxide to be kept at extremely low levels. **Through policy incentives, enterprises are encouraged to increase their investment in technology and adopt more efficient and environmentally friendly desulfurization processes to achieve substantial reductions in pollutant emissions. NO.3 Enhance the clean use of coal to reduce sulfur content at the source. In addition to measures taken at the end of the production process, the regulations also address sulfur removal in the coking industry by targeting it at the source of coal. Article 202 stipulates that **coal washing and processing should be promoted to reduce the sulfur and ash content in coal, and the mining of coal with high sulfur and ash contents should be restricted. New coal mines should simultaneously build accompanying coal washing facilities to ensure that the sulfur and ash content of the coal meets the specified standards ； For the coal mines that have already been built, unless the coal mined there has a low sulfur and ash content, or washing is not required in accordance with the standards set for coal-fired power plants, facilities for coal washing must be established within a specified time frame. GLT’s “zero waste liquid” desulfurization technology: The number one green solution to address the industry’s challenges. It eliminates desulfurization waste liquids at the source, achieving zero emissions. Based on the reaction mechanism of the targeted conversion of sulfur compounds in coke oven gas into elemental sulfur, and drawing on the traditional HPF desulfurization process used in coking, this technology effectively prevents the increase of sulfur-containing by-products during the desulfurization process, thus eliminating desulfurization waste liquids at their source. After the renovation, the hydrogen sulfide level is below 20 mg/Nm³, achieving true zero discharge of both liquid and solid waste. NO.2 Resource utilization of sulfur compounds to create economic value: GLT’s “zero wastewater” desulfurization technology enables the targeted conversion of hydrogen sulfide, with a sulfur recovery rate of over 99%, yielding sulfur of purity of over 90%. Through further refinement processes, it is upgraded to sulfur with a high purity of 99.95%, enabling higher value realization and meeting the current profit requirements associated with sulfur recovery. NO.3 The process is stable and reliable, helping to reduce operating costs. GLTT’s “zero waste liquid” desulfurization technology has been put into use in several coking plants in Shanxi and Baishan. The overall cost of desulfurization after this transformation – including handling waste liquids and recycling sulfur – has dropped to 5.4 yuan per ton of coke. Electricity consumption is reduced by about 30%, while steam consumption is cut by over 70%. The cost of sulfur recovery is reduced to 230 yuan per ton of sulfur. The implementation of the Environmental Ecology Code marks the entry of ecological protection in our country into an era governed by codes, imposing higher requirements on desulfurization efforts in the coking industry. As a key enabler for the green transformation of the coking industry, the GLT “zero waste liquid” desulfurization technology not only helps enterprises meet regulatory requirements but also enables reduction of waste at the source and efficient utilization during the desulfurization process, thereby generating significant economic benefits and environmental advantages for these companies.