Botian Environment overcomes the challenge of zero discharge in wastewater treatment for coal-to-oil production via coal indirect liquefaction

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This post was last edited by liaifeng on 2018-9-10 at 20:10. BoTian Environment Overcomes the Challenge of Zero Discharge in Wastewater Treatment from Coal Indirect Liquefaction for Oil Production. Author/Source: Date: 2017-02-24. Clicks: 69. http://img.yf116.cn/image/img/20170224/16204758847100.jpg. BoTian Environment has achieved a technological breakthrough in achieving zero discharge in wastewater treatment related to coal indirect liquefaction for oil production. On January 13, 2017, the **Energy Administration released the ‘13th Five-Year Plan for Energy Technology Innovation’, identifying five key areas of energy technology that are crucial for the development of China’s energy industry; the complete set of technologies for coal indirect liquefaction on a million-ton scale is one of these important areas. For the environmental protection industry, the treatment of wastewater generated from coal indirect liquefaction for oil production is also a challenge that needs to be addressed urgently on the path to green development. Recently, Botian Environment, which has extensive experience in the field of comprehensive services for complex energy, chemical, and water-related environments, has achieved a technological breakthrough in achieving zero wastewater discharge in the treatment of wastewater generated from coal indirect liquefaction processes for oil production, thereby providing further impetus for green development. The need for zero emissions in coal chemical industries for green development: In the energy and chemical industry, it is an important issue to determine whether wastewater generated from the indirect liquefaction of coal for oil production can be treated effectively and economically. On the one hand, wastewater treatment is difficult, as its organic matter concentration exceeds 15,000 mg/L, and it also contains a large amount of toxic and harmful substances. On the other hand, the locations where most coal chemical projects are built typically suffer from severe water shortages and fragile ecosystems, making zero wastewater discharge a key requirement for the development of this industry. Xu Yanhua, dean of the School of Environment at Nanjing Tech University, believes that the sewage system should be seamlessly integrated with the main process design for coal indirect liquefaction for oil production; water usage points, pollution generation points, reclaimed water reuse points, as well as sewage treatment and reclaimed water utilization should form an organic whole. As one of the few companies in China capable of providing comprehensive services related to energy, chemical, and water management, Botian Environment continues to invest in technological innovation. It plays an active role in supporting development; in the 1 million tons per year coal indirect liquefaction demonstration project operated by Shaanxi Future Energy Chemical Co., Ltd. in Yulin, Shaanxi (referred to as the “Future Energy Project”), Botian Environment was the first to overcome the challenge of achieving zero discharge of highly concentrated saline wastewater. This future energy project is one of the key projects under the 12th Five-Year Plan, and it is also China’s first coal indirect liquefaction project with a capacity of millions of tons. The scale of this wastewater treatment project is as follows: wastewater: 820 m3/h ； Reused water: 1300 m3/h ； Zero emissions: 175 m3/h ； Evaporation crystallization: 40 m3/h, including wastewater, recycled water, and zero-discharge treatment systems. In this project, Botian Environment utilized its industry-leading technical capabilities to overcome the technical challenges associated with wastewater treatment from coal-to-oil production via indirect coal liquefaction, thereby laying a solid foundation for the successful operation of the project. By mid-November 2016, zero emissions were achieved, successfully resolving the issue of high-concentration salt wastewater discharge in energy and chemical industries. After centralized and advanced treatment, most of the wastewater is reused as make-up water for the circulating water system. Once the concentrated brine meets the required standards, it undergoes further desalination, concentration, and evaporation crystallization. Each of these processes involves numerous complex technologies and procedures that are interlinked with one another, ultimately achieving zero emissions and producing finished mixed salts with a water content of less than 5%. Botian Technology develops efficient and energy-saving system solutions. http://img.yf116.cn/image/img/20170224/1622545897419.jpg In this project, Botian Environment not only achieved a significant breakthrough in terms of zero emissions but also provided enterprises with system solutions that combine \"comprehensive utilization of water resources + advanced wastewater treatment + zero emissions\", thanks to a range of patented and proprietary technologies. The project has also received widespread recognition, winning the \"2016 National Chemical Industry Quality Project Award\" awarded by the chemical industry, thus becoming a benchmark in the sector. In the biochemical unit, the OAAO+MBR process is employed, with multi-point water inlet and multi-point return systems to make full use of the carbon sources in the wastewater ； Replenish the alkalinity consumed by the aerobic reaction. At the same time, the mixture in the MBR membrane tank is recycled back to the pre-aerated tank, thereby making full use of the dissolved oxygen in the membrane tank and reducing the amount of air required for aeration as well as operational and maintenance costs. In the concentrated brine unit, Bote Environment’s patented Hi-SOT ozone catalytic oxidation technology is employed. This technology is a clean and efficient advanced oxidation method that combines a gradient composite oxidation device, synergistic oxidants, and high-performance catalysts to significantly improve the efficiency of ozone utilization and oxidation, greatly enhance the biodegradability of wastewater, and reduce both investment and operational costs. In the pre-treatment stage of the zero-emission system, Botian Environment’s proprietary MCR microfiltration for hard water removal, weak acid cation exchange resins, and carbon removal technologies are employed. The hardness of the wastewater resulting from this process is less than 0.5 mg/L, while the silicon content is below 20 ppm, ensuring the safe operation of subsequent systems. The membrane system uses two-stage concentration to enable 80% reuse of the produced water, with the concentrated water being sent to an evaporation crystallization unit ； At the same time, the system is designed with an efficient energy recovery device. The evaporation crystallization unit employs thermal vapor recompression (TVR), which makes effective use of waste steam from the plant and reduces system investment ； Compared to single-effect evaporation, it saves 60% on steam energy consumption. The Botian spirit continues to drive innovation. According to the design manager of Botian Environment’s future energy projects, “The design process involves both challenges and opportunities, as well as pressures and motivations; everyone gains a lot from this process and grows as a result, and such opportunities are what every environmental protection professional dreams of.” ” In this project, Botian Environment, with its usual commitment to work and high standards of quality, made active efforts to achieve zero emissions as soon as possible. The emphasis on technology and the collaboration among R&D teams are precisely what enable Botian Environment to overcome technical challenges time and again. In 2016, the Academy Member and Expert Workstation, established in collaboration with Hou Li’an, an academician of the Chinese Academy of Engineering and a renowned expert in environmental engineering, was officially inaugurated. Guided by practical environmental challenges, it addresses the key and difficult technical issues faced in areas such as the treatment of polluted water bodies, comprehensive watershed management, the development of sponge cities, and the recycling of difficult-to-treat wastewater along with achieving zero emissions, thereby creating more advanced technologies with independent intellectual property rights. Based on the academician workstations, Botian Environment has established environmental protection innovation hubs and collaborative innovation alliances to bring together a wider range of resources from within and outside the industry. It works together with enterprises in specific sectors to drive innovation, resulting in a variety of multi-dimensional cooperation models. At present, Botian Environment has established long-term \"strategic partnerships\" with institutions and enterprises in Denmark, Singapore, the United States, Germany, Israel, and other countries. It has forged close \"project collaborations\" with universities and research institutes such as Tsinghua University, Zhejiang University, Nankai University, Tianjin University, and Beijing Normal University. Additionally, it has developed extensive \"technical collaborations\" with the technical departments of key clients including Shenhua Group, CNOOC Group, and Yankuang Group. A broad foundation of cooperation further strengthens Botian Environment’s environment for innovation, providing a solid basis for the company to pursue higher goals. Zhao Lijun said that Botian Environment will continue to innovate in terms of technology and services, and will work strategically with high-quality clients to promote industry development and environmental improvement, thereby helping ecologically vulnerable areas find new green pathways for the energy and chemical industries.