Remediation of the effect of adding cyanides on an algal/bacterial treatment of a mixture of organic pollutants in a continuous photobioreactor |
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Authors: | Tamer Essam Marwa ElRakaiby Azza Agha |
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Institution: | 1. Microbiology and Immunology Department and Biotechnology Centre Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo, 11562, Egypt 2. Pharmacology and Toxicology Department and Biotechnology Centre Faculty of Pharmacy, Cairo University, Kasr El-Aini Street, Cairo, 11562, Egypt
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Abstract: | The effect of inorganic pollutants on the treatment of organic pollutants using algal/bacterial microcosm was investigated in a continuous photobioreactor. The microcosm was composed of Chlorella vulgaris MM1 and Pseudomonas MT1 and was able to efficiently treat artificial waste-water contaminated with 6.4 salicylate and 2.2 mM phenol at a hydraulic retention time of 4 days. No negative effect was recorded when the waste-water was supplemented with 1.6 mM thiocyanate; however, the treatment efficiency severely deteriorated when the system was challenged with 0.74 mM cyanide. Addition of 2 g NaHCO3 l?1 did not improve the efficiency of the treatment. Toxicity of the pollutants to the alga was cyanide > thiocyanate > phenol > salicylate. The high toxicity of the waste-water was eliminated either by a 25-fold dilution or by photocatalytic pre-treatment which allowed the subsequent efficient biological treatment. |
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