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1 2007

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Porównanie skuteczności koagulacji wodorotlenkiem wapnia oraz PIX-111 ścieków poprodukcyjnych z przetwórstwa ryb zakładu SUPERFISH w różnych warunkach temperaturowych

Piekarski J., Hauzer I.

Rocznik Ochrona Środowiska

2007

Tom 9

211-223

Technological hall where installation for wastewater from fish processing SUPERFISH plant treatment is located is not insulated. Therefore coagulation process during the whole year is carried out in various temperature conditions. This paper presents results of the research on efficiency of coagulation process with application of calcium hydroxide PIX-111 in various temperature conditions. Samples of wastewater ware taken after flotation node form pretreatment installation in SUPERFISH fish processing plant. Then wastewater underwent coagulation process with application of calcium hydroxide (dose 2 g/dm3), as a first variant, and PIX- 111 reagent (dose 0.35 g/dm3 as used in SUPERFISH pretreatment installation), as a second variant. Coagulation process was carried out in three temperatures: T1 = 3.5°C, T2 = 11°C and T3 = 21°C. After coagulation and sedimentation following parameters were determined: pH [-],biochemical oxygen demand BOD [mg O2/dm3], chemical oxygen demand COD [mg O2/dm3], total organic carbon TOC [mg/dm3], total suspension Z [mg/dm3], dissolved substances SR [mg/dm3] and conductivity S [mS/cm]. On the basis of gained research results it may be stated, that PIX-111 showed decidedly smaller variations of determined parameters values, than calcium hydroxide, which is a result of dissolubility of both reagents. Especially bigger dissolubility of calcium hydroxide in lower temperatures. Clear qualitative difference of wastewater after process of coagulation with calcium hydroxide and PIX-111 reagent in low temperatures (3.5°C) was affirmed. Most of wastewater pollution parameters reached smaller values in low temperatures (which prevails during autumn, winter and spring) in process of coagulation with calcium hydroxide, than with PIX-111 reagent, which, most probably, is connected with the inappropriate range of pH of this coagulant application. That is why in order to obtain values of pollution parameters within the range of standards in treated wastewater from SUPERFISH plant in dependence on temperature of coagulation process, PIX-111 reagent should be given up or apply in lower temperatures calcium hydroxide . Also in order to increase effectiveness of PIX-111 it is necessary to correct pH before coagulation with e.g. calcium hydroxide. In higher temperatures of coagulation process (21°C - average temperature in summer) with calcium hydroxide and PIX-111 reagent values of considered pollution parameters in wastewater are similar.