BACKGROUND Wastewater generated from seafood processing plants poses a serious threat to the draining environments. In addition, huge amount of fish scales are discarded as solid waste from seafood processing plants and fish markets. These biowastes can be used as biosorbent in the treatment of wastewaters. In the present work, waste fish scales were employed as biosorbent in order to explore the adsorption capacity of several pollutant parameters such as nutrients, ammonia, biological oxygen demand (BOD) and chemical oxygen demand (COD) in the treatment of seafood processing plant wastewater. The experiment was carried out as batch work under varying biosorbent dosage levels and contact times. RESULTS The biosorbent treatment showed >70% removal of nitrite, phosphate and BOD. The ammonia and COD were significantly (P < 0.05) reduced with >95% removal at the end of treatment process. Based on the results, the treatment showed best adsorption at 90 min contact time with a biosorbent dosage of 1 g/100 mL in the removal of BOD, COD and ammonia. Other parameters showed maximum reduction at 180 min contact time. Experimental data fitted well with the Langmuir and Freundlich isotherm models (R2 values ranging between 0.84 and 0.99). All of the data were statistically tested using SPSS v25 software. CONCLUSION The results of the present study showed that waste fish scales can be effectively reused as biosorbent in the treatment of organic pollutants from seafood processing plant wastewater. © 2020 Society of Chemical Industry (SCI)

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Background: Studies pertaining to the presence of OCP residues in the freshwater and marine ûshes caught from the Thamirabarani river basin region are not available to analyze the extent of bioaccumulation to assess their safety for human consumption. Hence, this study was undertaken as a maiden work to examine the OCP residues in the fishes collected from ûve sites spanning from the source to mouth region of the Thamirabarani river system, along with other related niches to examine the effect of environment pollution.Methods: Pesticides from fish muscle and their organs were extracted as per AOAC 2007.01 using QuEChERS method. A Gas Chromatograph model Perkin Elmer - equipped with Ni Electron Capture Detector of activity 15 MCi was used for the analysis. A volume of 1.0µl of the extracts was injected. The operating conditions were capillary column Elite-5 capillary column, 60m x 0.25mm, 1.00µm temperature programme: 70ºC (2 min) to 180ºC (I min) 25ºC/min to 300ºC 5ºC/min, Injection temperature: 270ºC, Detector temperature: 300ºC, Carrier gas: Nitrogen at 1.0 mL/min, Make up gas: Nitrogen at 29 mL/min.Result: Among fishes, rohu accumulated maximum of 0.4014 to 0.605 ug/kg of DDT in station IV and V respectively. Dhananjayan and Muralidharan (2010) reported OCPs in 156 fishes sample from Kaveri river. The average concentration of DDT ranged between 0 and 0.605 ug/kg. Bhuvaneshwari and Babu rajendran (2012) also reported 2.8 ug/g of DDT in fishes from Kaveri river. The low occurrence of DDT in the presence study is mainly due to their rapid degradation with living organisms.

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