May. 14th, 2018

On April 1, 2018, the 2nd-phase project of Yuncheng second sewage treatment plant of SafBon located in the coking Industrial Park of Yuncheng was successfully launched. This project is the coking waste water of the industrial park, which is difficult to deal with and requires high technology. It is a long-standing problem in the local area. After treatment, the effluent should meet the national discharge standard. Yuncheng county is located in the southwestern part of Shandong province. Zhuzhaoxin river which runs through the eastern part of the county and is an important part of the trunk canal of the eastern route of the South to North Water Transfer Project.

Therefore, ensuring the water quality of the water system has always been the top priority for the local government and environmental protection departments. The two phase of the Yuncheng second sewage treatment plant is located in the Yuncheng coking Industrial Park. And this coking Industrial park is located just right in the Zhu- Zhao New River Basin, and the drainage of the park directly into the Zhu- Zhao New River. In order to ensure the water quality of the Shandong section of the main canal in the south to the north project, the Heze municipal government promulgated the most stringent industrial wastewater discharge standards in the history of March 2018, requiring the concentration of COD less than 30mg/l, the concentration of total phosphorus less than 0.3mg/l and ammonia nitrogen less than 2mg/l. This brought unprecedented pressure to the Yuncheng county government and environmental protection departments, and also raised more stringent target requirements for the two phase expansion project.

Coking wastewater is one of the most difficult types of industrial wastewater, with complex components and a wide variety of components, not only the high concentration of CODcr and NH3-N, but also a large number of phenolic compounds and polycyclic aromatic compounds, heterocyclic compounds and aliphatic compounds containing nitrogen, oxygen and sulfur, with many toxic components and high chromaticity, brings great difficulties to biodegradation and the cost of processing is high. At the same time, under the current environmental protection situation, the coking enterprises are built with advanced oxidation pretreatment system in the internal waste water, and the pre treated wastewater is reconcentrated to the industrial sewage plant of the park, which makes the coking wastewater more difficult to break down the chain degradation. Therefore, how to deal with the "two coking wastewater" to achieve qualified discharge has always been one of the most difficult subjects in the domestic and foreign water treatment industry.

Facing the difficulty “secondary coking wastewater” problem, SafBon performed full evaluation of the characteristics of local coking wastewater pollution and conducted on-site pilot tests and scientific experiments. The technical solutions issued by SafBon based on the above materials received the approval from the government finally.

At present, the second phase expansion project of Yucheng Second Sewage Treatment Plant is under construction. It is expected that the commissioning phase will start at the end of December. The completion of this project is believed to completely solve the problem of coking wastewater treatment in the park, producing obvious economic benefits in the local area, also playing a positive role in water quality protection of the South-Water-to-North Project.