Reduktion av föroreningar i processvatten från en äggfabrik i Brasilien
Kväve- och fosforrening i anlagda våtmarker.
Constructed treatment wetlandNitrogen removalPhosphorus removalIndustrial food wastewaterWater purificationAnlagd våtmarkKvävereningFosforreningProcessvatten från livsmedelsindustrierVattenrening
A water treatment unit consisting of two aeration basins, two settling tanks, a residence basinand a horizontal subsurface flow wetland were used to treat wastewater from an eggprocessing factory in Brazil. The aim of this paper was to determine the efficiency of thesystem in reducing nitrogen, phosphorus, BOD5 and TSS (among other parameters) andgetting a further understanding on different kinds of constructed treatment wetlands as well astheir nitrogen and phosphorus removal processes. The wastewater from the factory consistedof process water from manufacturing and water used for cleaning, no stormwater or sewagewater entered the system. Tests were taken three times a month from October 2013 ?til April2014. The mean influent concentrations from wastewater directly from the factory were2,606 mg/L, 46.60 mg/L, 318.3 mg/L and 1,112 mg/L for BOD5, TP, TKN and TSS. Themean results of reduction through the wetlands gave the following results; BOD5 42 ± 351%,TP 66 ± 9.7%, TN 42 ± 13% and TS -11 ± 30%. Compared to other wetland systems treatingsimilar wastewater the reduction of BOD5 and TSS is low. Recommended solutions toincrease the reduction in the wetland are presented in the discussion.