O. Nkwonta, O. Olufayo, G. Ochieng, J. Adeyemo and F. Otieno, “Turbidity Removal: Gravel and Charcoal as Roughing Filtration Media,” South African Journal of Science, North America, Vol. 106, No. 11-12, 2011, pp. 1-5.

has been cited by the following article:

• TITLE: Enhancement of Quality of Secondary Industrial Wastewater Effluent by Coagulation Process: A Case Study

  AUTHORS: Hossam Altaher, Ahmed Alghamdi

  KEYWORDS: Coagulation, Turbidity, Industrial, Wastewater, Treatment, Polymer

  JOURNAL NAME: Journal of Environmental Protection, Vol.2 No.9, November 2, 2011

  ABSTRACT: The local wastewater treatment facility in Yanbu Industrial City receives 24,000 m3/day of industrial wastewater. This wastewater, mostly from refineries and petrochemical industries, goes through physical, biological and chemical stages of treatment. However, the treated water still fails to pass some of the permissible levels set by governmental agencies. This research paper investigated the enhancement of the treatment processes to reduce the turbidity of the effluent treated water. Ferric chloride, ferrous sulfate, alum and commercial synthetic cationic polymer were tried as coagulants. Different conditions (i.e., pH, temperature, dose, stirring rate) were searched. Ferrous sulfate and polymer reduced the final turbidity to acceptable values with very low doses compared with other coagulant.