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The two indicators of effluent phenol content and chemical oxygen demand are the key indicators for coal chemical wastewater discharge standards, especially the treatment of coal gasification wastewater containing polyphenols is a world problem, and this was involved in the Songhua River in 2005. Coal chemical companies with pollution incidents can actually reduce the two indicators several times or even thousands of times in just two years. It is not hard to imagine the effort and sweat that they have to pay. The company's achievements in wastewater treatment were highly valued by the Ministry of Environmental Protection and the Heilongjiang Provincial Party Committee and the provincial government, and delivered a high score for environmental protection in the Songhua River Basin.
Due to the defects in the original design process and the poor coal quality of raw coal, the company caused long-term discharge of wastewater exceeding the standard. In spite of all the efforts made by the company, more than 47 million yuan was self-financed. From 1994 to 2005, dozens of environmental protection technologies were tackled, but the wastewater discharge index was still unsatisfactory. A wave of waves has risen again. While the company was distressed by the fact that the discharge of wastewater was not up to standard, the Songhua River water pollution incident that took place in 2005 also rolled the company in. In 2006, the company was listed as the second batch of joint supervision units by the former State Environmental Protection Administration and the Ministry of Supervision. The environmental protection department produced a “yellow card†for the company. At this time, Harbin Coal Chemical Co., Ltd. suffered unprecedented pressure and companies faced production suspension.
In September 2006, after the company was placed under the China Coal Group, China National Coal Group used Longhua as its strategic base and platform for the development of coal chemical industry, and increased its capital investment so that the company had a chance to shake off the predicament. The environmental protection department organized environmental experts and research institutes both inside and outside the province to discuss various plans and plans for the company's wastewater treatment, and determined that the Harbin Institute of Technology's Architectural Design and Research Institute would undertake the company's wastewater treatment on the 6th day after being listed and supervised. Project design tasks.
The company conducted a comparative inspection of methyl isobutyl ketone extraction technology, manganese ore processing technology, liquid membrane extraction technology. In February of this year, the investment of 16 million yuan was made by the single tower pressure stripping deacidification and deamination technology of South China University of Technology. After pretreatment, the pH of the phenol wastewater was reduced from 9 to 10 to about 6 so that the content of polyphenols was increased. The 1200 mg / up to 500 ~ 600 mg / liter. Since the beginning of this year, the company's technical personnel have used the original pre-treatment decommissioning equipment and transformed a pre-treatment device with a processing capacity of 40 tons/hour. In May of this year, they began trial operation of a comprehensive wastewater biochemical treatment and transformation project with a total treatment capacity of 360 tons/hour, and all the targets reached or approached the national first-level emission standards. In July this year, the company stopped discharging wastewater into the accident pool and achieved a goal of a small number of accident pool wastewater return systems.
According to Xia Zunjiang’s manager, “The total investment of 180 million yuan in gasification of phenol-containing wastewater for pretreatment and biochemical treatment has been completed, and it is expected that the company’s chemical oxygen demand will be less than 100 mg/L by the end of November this year. After this indicator, the company will take off the environmental protection 'yellow card' and achieve the target of waste water compliance. The company will next build a 130 tons/hour phenol-containing wastewater pretreatment unit for a 250,000-ton/year methanol plant to facilitate the accident pool. The wastewater in the company (the current storage capacity is about 300,000 tons) is all pumped back and discharged to meet the standards, so as to completely eliminate the safety hazards in the accident pool. The company will also strengthen the management of accident pools and ash storage dams and improve the three-level prevention and control system. To ensure the environmental protection goals of 'no workshops, no secondary plants, no third-level rivers,' and to assume more social responsibilities for protecting the rivers and rivers of the Songhua River."
Looking forward to not only take off the environmental protection "yellow card"
“At present, the effluent phenol content of the company's effluent has been less than 0.1 mg/l, and that of petroleum is less than 4 mg/l. Both indicators have met the national first-class emission standards. Chemical oxygen demand has dropped to 100 to 200 mg/l, ammonia nitrogen 15 At ~50 mg/l, it is also close to the national first-level emission standard.Furthermore, the company has also solved the world problem of handling polyphenols in phenol-containing waste water. The company's removal of the national environmental protection 'yellow card' is no longer a dream."Reporter In an interview with China Coal Longhua Harbin Coal Chemical Co., Ltd., the manager of the company's environmental protection department, Xia Zunjiang, said with optimism.