摘要：

通过对石化污水水质特性的研究,阐述了石化污水中的氨氮、硫化物、石油类、微生物、悬浮物、含盐量在不同浓度下对循环水水质处理的影响,提出了石化污水回用水的参考水质标准。并经过工业应用试验验证,指出达到国家一级排放标准的石化污水直接回用于循环冷却水在技术上是可行的。

关键词: 石化, 污水回用, 水质特性, 循环冷却水

Abstract:

The characteristics of petrochemical wastewater quality have been studied.The influence of NH3-N,sulfide,petroleum,microorganism,suspended soid and TDS(total dissolved solid)with different concentration in petrochemicalwastewter on the water quality treatment of circulating cooling water has been demonstrated.A referential standard of waterquality for petrochemical wastewater reuse is presented.Through tests in industrial application,it is pointed out thatthe direct reuse of petrochemical wastewater,which has come up to the first grade discharge standard,in circulating coolingwater technique is feasible. Soda straw pulp black-liquor is characteristic of its high silica content,high pH values,high concentrations oflignin and high organic pollutant content.Amongst them,lignin is primarily responsible for its color and chemical oxygendemand (COD).Lignin is non-biodegradable due to its composition of various stable chemical bonds and structure units.In this study pretreatment of soda straw pulp black-liquor with CaCl₂ is investigated.It is found that CaCl₂ could combinereadily with SiO₃^2-to precipitate as CaSiO₃.CaCl₂ could displace Na⁺ in sodium lignin to form insoluble calcium lignin.CaCl₂ could also combine with other organic pollutants in the black-liquor.With the removal of silica and the separationof lignin,the COD of the wastewater decreases sharply and the color changes from dark black to light yellow.Soda lossis considerably low during the process. "A pilot study of ozone-biological activated carbon process for oil refining wastewter reuse is described.Whenthe concentration of ozone is about 18.12 g/m³,the removal of oil,COD and bacteria are 79 %,28 %and 100 % repectively.And the ratio of BOD/COD increases to 0.237.After the alteration of air feeding and addition of alkali,biologicalactivated carbon process can remove oil,COD and ammonia from wastewater.The removal of oil,COD and ammonia increasesto 100 %,39.7 %,87.1 %.After treatment by ozone-biological activated carbon process,the oil refining wastewatercan be reused in circulating cooling system. "

Key words: petrochemistry, wastewater reuse, characteristics of water quality, circulating cooling water

中图分类号: 

• TQ085