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Immobilized periphytic cyanobacteria for removal of nitrogenous compounds and phosphorus from shrimp farm wastewater

Cyanobacteria can be used to remove nitrogenous compounds from wastewater, but a major bottleneck in the process is the separation of cyanobacterial biomass from the treated water discharge, which may cause eutrophication. | Turkish Journal of Biology Turk J Biol (2015) 39: 388-395 © TÜBİTAK doi:10.3906/biy-1407-26 http://journals.tubitak.gov.tr/biology/ Research Article Immobilized periphytic cyanobacteria for removal of nitrogenous compounds and phosphorus from shrimp farm wastewater 1 1, 1,2, 1,3 Sanjoy BANERJEE , Helena KHATOON *, Mohamed SHARIFF **, Fatimah Md. YUSOFF 1 Institute of Bioscience, Universiti Putra Malaysia, Serdang, Malaysia 2 Faculty of Veterinary Medicine, Universiti Putra Malaysia, Serdang, Malaysia 3 Department of Aquaculture, Faculty of Agriculture, Universiti Putra Malaysia, Serdang, Malaysia Received: 08.07.2014 Accepted/Published Online: 07.12.2014 Printed: 15.06.2015 Abstract: Cyanobacteria can be used to remove nitrogenous compounds from wastewater, but a major bottleneck in the process is the separation of cyanobacterial biomass from the treated water discharge, which may cause eutrophication. The current study assessed the suitability of three periphytic cyanobacteria (Geitlerinema sp., Gloeotrichia sp., and Lyngbya sp.) isolated from shrimp ponds. These cyanobacteria were immobilized by self-adhesion to polyvinyl chloride sheets, forming mats, and were screened for their efficacy to reduce nitrogenous compounds and phosphorus. Among the three isolates, Geitlerinema sp. showed the highest reduction rate (98%) and was further tested using shrimp pond wastewater. The results showed that initial wastewater concentrations (mg L–1) of total ammonia nitrogen (5.0), nitrite nitrogen (2.9), and soluble reactive phosphorus (2.5) were significantly (P 0.05) in accumulation of biomass in terms of chlorophyll a was observed between Gloeotrichia sp. and Lyngbya sp. (Figure 1). 3.3. Selection of cyanobacterial isolate for maximum reduction of TAN, NO2-N, and SRP Among the three isolates, Geitlerinema sp. significantly reduced (P < 0.05) TAN by 98 ± 0.05%, NO2-N by 700.0 Biomass (mg m –2 ) dark photoperiod. Cyanobacterial biomass in terms of chlorophyll a .