【HaiChuan Chemical Project Updates】Hangzhou Water Treatment Consortium successfully won the bid for a BOT project aimed at achieving zero wastewater discharge at a coal chemical enterprise in Shanxi
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According to the National Energy Information Platform, on May 20, Hangzhou Water Treatment won the bid for a BOT project aimed at achieving zero wastewater discharge at a coal chemical enterprise in Shanxi. This is the first project of its kind for treating coal chemical wastewater, as well as the first BOT project undertaken by Hangzhou Water Treatment Center. It marks a significant breakthrough in the use of zero-discharge technology in the treatment of coal chemical wastewater, and has earned high recognition from the market. This coal chemical enterprise attaches great importance to environmental protection issues. In response to the calls for environmental sustainability and with a view to the long-term development of the company, it plans to invest in the construction of wastewater treatment facilities. The wastewater generated by this project comes from sources such as wastewater from raw material gas, wastewater from purification towers, wastewater from sedimentation tanks, desulfurization waste liquid, decarboxylation wastewater, and formaldehyde wastewater. The diversity and complexity of these water sources have at one time posed a serious challenge that hindered the company’s rapid development. Through more than half a year of in-depth discussions, on-site inspections by both parties, and various experimental tests, the membrane-based salt separation and concentration as well as quality-separated crystallization technologies developed independently by Hangzhou Water Treatment stood out among numerous suppliers. By using membranes to concentrate the biochemical wastewater in the system, fresh water can be recovered, while the concentrated waste water is sent to the salt separation and crystallization unit for further treatment. The resulting water meets the standards required for reuse in production. Meanwhile, the sodium sulfate and sodium chloride crystals obtained meet the requirements for industrial salts produced as by-products in coal chemical industries, enabling the recycling of resources. Upon completion of the project, it will be able to treat 1.2 million tons of wastewater per year. This not only helps enterprises address their wastewater treatment issues and protect the environment surrounding the industrial park, but also promotes the dual development of economic and social benefits for these enterprises.
This project was constructed through a BOT model in collaboration between Hangzhou Water Treatment and its partners. During implementation, Hangzhou Water Treatment took the lead with its advanced process design concepts, being responsible for the overall design of the project； Leveraging membrane concentration technology as its strength, it is responsible for the design, procurement, and implementation of the core process of the project: the zero-emission system. Hangzhou Water Treatment always adheres to the core value of customer orientation, starting from the actual needs of its clients. It places great emphasis on environmental protection, pays attention to the rational allocation of resources, and maintains strict standards for safe production. The company strives to achieve coordinated development in the economic and social sectors, as well as in terms of the environment and resources, and uses its technical expertise to contribute to cleaner production in the coal chemical industry.
Membrane desalination concentration plus selective crystallization represents a new ZLD process route; however, it requires high standards for membranes, and their operational lifespan is a factor to consider.