Page:of 174 Automatic Zoom International Conference on Aquatic Resources: Needs and Benefits NIOF 2006 18-21 st September 2006 Alexandria, Egypt ABSTRACTS Edited by : Professor Fatma Aly Abd El-Razek Professor Makram Amin Gerges Professor Abdou Al Sayes Associate Professor Ahmed El Nemr Dr. Amr Moneer Helal ISSN: 1687-580X ISSN: 1687-580X 58 Session (5): Aquatic Pollution: Waste Treatment Oral Presentation Removal of Hexavalent Chromium from Aqueous Solution, Wastewater and Saline Water by Inactivated Red Alga Pterocladia Capillacea and Its Activated Carbon Ahmed El Nemr*, Amany El-Sikaily, Azza Khaled and Ola Abdelwehab Department of Pollution, Environmen tal Division, National Institute of Oceanography and Fisheries, El Anf oushy, Kayet Bey, Alexandria, Egypt *E-mail: ahmedmoustafaelnemr@yahoo.com Pterocladia Capillacea , a red marine alga, was tested for its ability to remove toxic hexavalent chromium from aqueous solution. An activated carbon obtained from Pterocladia Capillacea via acid decomposition was also investigated as an adsorbent for toxic chromium. The experiments were conducted to study the effect of important parameters such as pH, Chromium concentration and adsorbent weight. Batch equilibrium tests at different pH conditions showed that at pH ~ 1.2, a maximum chromium uptake was observed for both inactivated Pterocladia Capillacea and its activated carbon. A solu tion of 0.1 M NaOH performed well in eluting chromium from chromium-loaded biomass and caused no damage to the biosorbent. The ability of inactivated Pterocladia Capillacea and its activated carbon to remove chromium from synthetic sea water, natural sea water and wastewater was investigated as well. Langmuir and Freundlich models were used to anal yze the experimental data and the models parameters were evaluated. In regeneration experiments, a loss of sorption performance was observe d during the sorption-desorption indicated by a shortened breakthroug h time and a broadened mass transfer zone. The pH value play the key fact or for sorption-desorption process. This study showed that the remova l of toxic chromium by activated carbon developed from Red alga Pterocladia Capillacea is comparable to that of commercially av ailable activated carbon. ISSN: 1687-580X 59 Session (5): Aquatic Pollution: Waste Treatment Oral Presentations Bioremediation of Anthracene by Free and Immobilized Marine Pseudomonas Fluorescens Manal M. A. El-Naggar 1 * and Tarek O. Said 2 1 Microbiology Lab. and 2 Chemistry Lab., Marine Environmental Division, National Institute of Oceanography and Fisheries, El-Anfoushy, Kayet Bey, Alexandria, Egypt *E-mail: melnaggar66@yahoo.com Anthracene is a polycyclic aromatic hydrocarbon (PAH) with high pollution potential and health hazard. It has been used as a model for degradation studies on PAHs, because of its relative toxicity. The aim of the present study is to evaluate the degradation of anthracene by Pseudomonas Fluorescens isolated from Abu Qir Bay, where many industrial effluents are discharged. Th e identification was performed using API E20 kits. The physiological cond itions for the free and immobilized bacterial cultures were optimi zed (pH 7.5, 35ºC and 3ml.100ml -1 inoculums with 1.0 x 10 7 cell/ml). The anthracene (200, 400, 800 and 1200 ppm) were applied in the medium as a sole sources for carbon and energy. The degradation of anthracene was carried out by free and immobilized cells of P. fluorescens . A glass column (50 cm) was used for the immobilization process, it was packed with a sterilized solid supporter (pumous granules; 25-30 g) and aerated with sterilized air pumped through the column (1.2 litter/min). The detec tion for anthracene degradation was done using gas chromatograph (Hew lett Packard 5890 Series II Gas Chromatography) equipped with an FID and capillary column HP-5 (30 m x 0.32 mm r.d. x 0.25 μm). the results indi cated that this bacterial isolate has a specific and selective action to wards the anthracene. The free cells of P. fluorescens degraded 400 and 800 ppm anthracece in 4.5 dars with a rate of 3.59 and 5.42 mg.l-1.h-1, respec tively, while the immobilized cells showed to be more efficient an d applicable in degrading 400 ppm anthracene in absence and/or in pres ence of other PAHs (naphthalene and chrysene). The efficiency % of the system was 97.35% (after 48 hrs) and 97.8% (after 120 hrs).
