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Many Chinese small electroplating enterprises usually discharge mixed electroplating wastewater which contains CN-, Cr(VI), Cu2+, Zn2+ and other toxic heavy metals. It is hard for efficiently treating this mixed wastewate. At present, conventional chemical methods could usually meet discharge standard, but may not meet recycling need. In this paper, a combined treatment process include O3 oxidation,...
O3-biological zeolite processes was used to treat micro-polluted raw water, The results show that zeolite modified by NaCl is efficiency on ammonia-nitrogen removal, at pH 6~9 and 150 min stirring time, the ammonia-nitrogen removal rate is 71.2%;During the culture of biofilm, ammonia-nitrogen removal rate of water treated by biological zeolite increased after decreasing. When the biofilm is mature,...
A kind of technology and process of treating printing and dyeing wastewater with high efficiency and low energy consumption was presented. Based on the analysis of the current methods, this article summed up the more practical way, combining theory with practice, to provide some references for the similar projects.
The raw water was diluted in four levels of 20%, 40%, 60%, 80% in the bio-membrane initiating process. When the raw water concentration was invariable , and hydraulic retention time, dissolved oxygen, pH and water temperature were 3 h, 3.5 mg/L, 7.05 ~ 8.23, 17.4 ~ 30.6°C respectively. Results showed removal rates of combined packing to COD, BOD5, NH3-N and TP were about 76.3%, 78.4%, 74.9% and 58...
In order to achieve the goal of reusing the mine water with high manganese, this paper studies the mechanism with surface-modified filtration media in treating the mine water from 9th-colliery of Hebei Coal Group. The experiment results show that: the quality of effluent is stable by manganese sand immersed with 3-5% KMnO4, the single cycle can reach 24 hours with manganese less than 0.1 mg/l, and...
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