At the end of May, the first phase of the construction of the second sewage treatment plant in Suzhou Industrial Park began trial operation, and the first phase of sludge drying treatment for sewage treatment facilities also started. In this regard, people in the chemical industry clap fast. They believe that the park has provided a demonstration for effectively solving the problem of “heavy water, light and mud†that currently exists in the domestic wastewater treatment industry and opens up a new path for the secondary pollution control of sludge. According to the relevant person in charge of the Suzhou Industrial Park, the second sewage treatment plant in the industrial park is currently the largest and first sewage treatment plant in Jiangsu Province that has been constructed in full compliance with the Taihu drainage standard. The design scale is to treat 300,000 tons of sewage every day, and the daily processing capacity of the first phase of the trial operation has started to be 150,000 tons. The sludge desiccation treatment project, which is matched with the sewage treatment plant, has a total design volume of 900 tons of wet sludge per day. Among them, the first-phase project is designed to handle 300 tons of wet sludge daily, with a total investment of 180 million yuan. It is planned to be completed and put into operation in September 2010. "This sludge drying treatment project can dry 70% to 80% of the wet sludge generated in the production process of the sewage treatment plant to dry sludge with a moisture content of less than 10%, and then mix it with coal. And incineration to recover the energy existing in the dried sludge, and the final residue can be used in road construction and cement manufacturing. After the completion of the project, the wet sludge produced by the park's wastewater treatment plant during the production process can directly realize environmental protection and reuse. The person in charge of the project added. It is understood that the current "heavy water light mud" is a common phenomenon in the domestic sewage treatment industry. The reporter has seen in many industrial parks and chemical companies that many sewage treatment plants are often piled up in the open air from the water treatment plants due to lack of technology and funds, relying on natural ventilation and sunlight to remove most of the waste. Moisture, and then shipped out for simple pitfill. Only a small part of the sludge has been made harmless by an incinerator, but it is basically a net investment, and the effective energy has not been recycled. According to expert analysis, the sludge burial method has many drawbacks: most of the sludge containing toxic and harmful substances do not use any pollution prevention measures, and it is easy to cause harmful substances in the sludge to pass through rain erosion and leakage, and pollute the groundwater environment in different degrees; Stacked sludge is easy to run off in the rain, and it is seriously damaged by the water after it is washed into the ditches and rivers. After the sludge is dried, it encounters windy weather. The dust flies everywhere and forms a more extensive source of pollution. It can be seen that improper disposal of sludge will cause secondary pollution of the environment, which means that the previous water treatment process will be abandoned. Experts believe that the method of sludge treatment incineration and utilization in Suzhou Industrial Park should be actively promoted and popularized. On the one hand, it has achieved a true environmental protection for sludge disposal. On the other hand, it is more conducive to energy conservation and emission reduction. Relevant chemical companies should be aware that chemical sludge and general living sludge are very different in composition, and that the toxic substances cannot be detoxified by relying on underground burial. This action is not responsible for society and human beings. According to a recent survey of sludge generated by urban sewage treatment plants in Jiangsu Province, only sludge produced by sewage treatment plants in the provinces and municipalities of the province has reached 220,000 tons per year. According to the national “Eleventh Five-Year Plan†environmental protection plan, the sewage treatment rate by 2010 is not less than 70%. It is expected that the national daily sewage treatment capacity will exceed 100 million tons, and the amount of sludge produced each year will reach more than 36 million tons. It can be seen that the harmless treatment of sludge has become an urgent environmental issue. The reporter learned from the Jiangsu Environmental Protection Agency that this year, the province will focus on seven major environmental issues, including one for comprehensive treatment of industrial sludge. According to Ding Xingkui, director of the Provincial Environmental Protection Office's Office of Letters and Visits, in the past cases of environmental violations and violations reported by the public, the improper disposal of chemical sludge accounted for a considerable proportion. Some of the chemical companies actually signed agreements with local village committees or individuals that do not have sludge treatment conditions. At present, stimulated by the country’s 4 trillion yuan domestic demand policy, an upsurge in the construction of sewage treatment plants has been set up throughout the country. Experts emphasized that when submitting a sewage treatment and construction project, the supporting construction of sludge treatment should not be neglected. At present, the more feasible approach is to start the sludge drying and incineration plant and remove the sludge as soon as possible by directly filling and burying it. According to a survey by the reporter, in fact, many chemical parks and large chemical companies generally have their own thermal power plants. In addition, wet mud drying is not a technical problem. Therefore, sludge incineration should not be a problem. The key is for enterprises to raise their awareness and consciously take up social responsibilities and achieve win-win results through the scientific treatment of sludge and environmental protection and benefits. It is reported that in the next two years, the central government's investment in the sewage treatment industry will be 90 billion yuan. Together with bank loans and other funds, the investment in the sewage treatment industry will reach 280-300 billion yuan. Relevant chemical parks and chemical companies should take advantage of this opportunity to vigorously build sewage treatment plants while actively adding sludge treatment devices to fundamentally solve the secondary pollution caused by sludge to the environment.
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