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Tap water manufacturers have not yet fully determined the way out of the sludge. However, according to expert analysis, the general direction in the future is to burn the sludge into bricks and transport them to construction sites. At the same time, the sludge can also be processed into farmland fertilizers for farmland use. However, farmers currently use chemical fertilizers and how to make the sludge. Fertilizers adapted to the needs of farmland remain to be further studied.
There are two new processes. Although the sludge is not significantly toxic, long-term siltation of sludge in the river will raise the river bed and require a lot of manpower and material resources to carry out dredging; in addition, if the sludge discharge site and tap water source water intake The same land will adversely affect the reduction of turbidity in tap water, thereby reducing the quality of tap water. It is imperative that the water plant implements the harmless disposal of sludge.
According to the introduction of Shanghai Water Affairs Bureau, there are mainly two methods for sludge treatment. One is the centrifugal dewatering process and the other is the extrusion process of the plate and frame. Sludge treatment at the second water plant of the Minhang Minhang Company in southwestern Shanghai has been completed in May 2003 and has become Shanghai's first environmentally friendly water supply company. The plant uses a centrifugal dewatering process. This is a modern sludge treatment unit that can solidify sludge with up to 90% moisture content. With a sludge feed concentration of 2.5% to 3.5% solids, up to 25 to 30 cubic meters per hour can be processed in a single machine, and solids can be separated up to about 1 ton. Minhang District completed the 400,000-ton tap water advanced treatment project in 2005, and by 2007, it will be the first company in the city to meet the current EU standards.
Twelve water plants will follow the standard in Minhang District. The sludge decontamination of Yangshupu Waterworks Plant and Changqiao Water Plant (one phase) has also started. The Yangshupu Water Plant will invest 280 million yuan. It is planned to be completed by the end of 2004. . The Water Affairs Bureau revealed that according to the plan, Beiyuepu Water Plant and Linjiang Waterworks in Pudong will also start similar projects this year. The Yuepu Water Plant is scheduled to be completed in June 2004. In the future, there will be the Nanshi Waterworks, Zhabei Waterworks, Taihe Dachang Waterworks, Jujiaqiao Waterworks, Lingqiao Waterworks, etc. Zhabei Waterworks is scheduled to be completed by the end of 2005.
It is reported that at the same time as using the centrifugal process, some water plants will also use the plate and frame extrusion process for the first time to carry out the harmless treatment of the sludge. That is, after the sludge water is squeezed, the “solid-liquid separation†and the sludge The water is detached.
The environmental experts of the Municipal Environmental Protection Bureau pointed out that the tap water source used by the Shanghai residents comes from the Huangpu River and the Yangtze River. The implementation of the sludge harmless treatment in the water plant will be beneficial to the pure purification of tap water. Until the completion of the sludge decontamination project in 12 municipal water plants in 2005, the water environment in Shanghai will be further optimized.
New process makes sludge become a baby
In Shanghai, the muddy water that precipitated from the tap water production process is usually discharged into the Huangpu River again. This practice of 120 years of tap water production in this city will be completely terminated. It was learned from the Shanghai Municipal Environmental Protection Bureau that the use of modern technology to carry out tap water sludge treatment process has begun to be used in the city. It can solidify sludge with high moisture content. By 2005, the city’s 12 municipal water plants were not only Basically, sludge water no longer discharges rivers, but also turns waste into treasure. The treated sludge is transferred to construction sites or farmland, etc. It can be used to make regular bricks. It can also be used to make fertilizers. Sludge water will appear. The amount of sludge in a ton of sludge water will be 1-3%. Due to the influence of process, capital, and habits, for a long time, the production sludge water (mainly tap water sedimentation tank sludge discharge, filter tank flushing water) in the process of water production in the Shanghai Water Plant is usually discharged directly into rivers without treatment. . At present, Shanghai has an average of at least 500 tons of sludge from the water plant that is discharged into the river every day.