000			03409nam a2200229Ia 4500
008			170324s9999 xx 000 0 und d
082			_a363.7284
100			_aJude Armstrong
100			_eResearcher
245		0	_aTreatment of wastewaters from seafood processing plants for aquaculture purposes
245		0	_cby S. Jude Armstrong
250			_aM. F. Sc
260			_aThoothukudi
260			_bFisheries College and Research Institute
260			_c1993
300			_a67p
300			_bCol. Plates
500			_aInclude reference
521			_a"For the present investigation, the physico-chemical characteristics of wastewaters from a cuttlefish processing plant and shrimp processing plant such as temperature, pH, free carbon dioxide, dissolved oxygen, salt content, alkalinity, suspended solids, hydrogen sulphide, BOD, and COD were studied. Wastewater samples were collected from four stages of treatment in the cuttlefish processing plant and two stages of treatment in the shrimp processing plant since the treatment system in the latter was different from that of former. The wastewater of cuttlefish processing plant showed higher values of organic load (COD: 1472 � 61 mg.1-1, BOD : 563 � 30 mg.1-1 ; suspended solids 2587 � 142 mg.1-1 ) than that of shrimp processing plant (COD: 1410 � 37 mg.1-1, BOD : 674 � mg.1-1 ; suspended solids 2386 � 71 mg.1-1 ). The poor values of BOD observed in the wastewater of cuttlefish processing plant showed that it may possess antiseptic properties. The final treated effluent of cuttlefish processing palnt had less organic load (COD: 200 � 9 mg.1-1, BOD: 145 � 7 mg.1-1 ; suspended solids 1004 � 64 mg.1-1 ) compared to that of shrimp processing plant (COD: 675 � 14 mg.1-1, BOD : 386 � 12 mg.1-1 ; suspended solids 1521 � 72 mg.1-1 ). Bioassay, biodegradation, chemical treatments and live food culture experiments were made for the wastewater of cuttlefish processing plant. The aerobic and simulated anaerobic degradation of wastewater showed highly significant (p<0.01) negative correlation of COD with reference to the period of degradation. The bioassay experiments conducted using red tilapia showed that only 2.5% of raw wastewater and 4.3% of treated effluent could be utilized for fish culture purposes. The respective application factors were 0.254 and 0.215. The 96 hr LC50 values for raw and treated wastewater were found to be 10% and 20% respectively. The wastewater was treated with various chemical coagulants such as Alum, Ferric Chloride, Ferrous Sulphate and Oxidant, Potassium permanganate. A negative correlation could be noticed between COD and the concentration of these chemicals. The nutrient rich wastewater was found to be suitable for live food culture at low (20%) concentration. The zooplankton raised in the live food culture system using 20% wastewater concentration supported the growth of Brachionus spp., Cyclops spp, Daphnia spp, Limnocalanus spp, Diaptomus spp and Keratella spp contributing 38.7%, 33.9%, 23.1%, 1.6%, 1.5% and 1.2% respectively. The wastewater aerated after one month of anaerobic degradation was found to be directly suitable for aquaculture purposes. It suggests that the standardization of retention time and aeration at final tank after anaerobic degradation may be considered if recycling is contemplated."
650			_aWastewater - Treatment
942			_cRF
999			_c10677 _d10677