Utilization of Immobilized Algae for COD, N,P Removal in Textile Wastewater

Abstract

Development of the textile industry in Indonesia is quite promising, which reached 1.48% per year. Textile wastewater has characteristics of concentrated color and containing of COD, BOD, N, P, and heavy metals are high. Immobilized microalgae bioremediation is an alternative that can be done to reduce the disadvantages of bioremediation using free microalgae without reducing its ability to reduce waste contaminants. The objective of the research is to observe reduction of color, COD, N, and P of textile wastewater by using microalgae immobilization. In the acclimation process in textile wastewater, Chlorella vulgaris and Spirulina platensis was cultured in 1.5%, 2%, 2.5%, and 3% textile wastewater by the addition 50% of syntetic nutrients. the optimal concentration for the cultivation of microalgae Chlorella vulgaris highest OD680 occurred on day 7 of 0.43 obtained in 2.5% of textile wastewater. Spirulina platensis reached highest OD680 on day 12 of 0.4 obtained in 2.5% of textile wastewater. The best ratio removal COD, N, P textile effluent obtained at a ratio of 1:3 v/v (bead:wastewater). Chlorella vulgaris and Spirulina platensis immobilized decrease highest COD by 44% and 43% with a final concentration of 235 ppm and 240 ppm. Nitrogen and total phosphorus absorbed 100% on day 5. Factor affecting removal COD, N, P of textile wastewater by immobilized microalgae is ratio bead:wastewater and heavy metal concentration KEYWORD: Immobilized microalgae, Textile Wastewater, COD, Nutrient