Marmara Denizi Yüzeyinden Toplanan Müsilaj Biyokütlesinin Suyunun Giderilmesi: Koagülasyon ve Santrifüj Proseslerinin Optimizasyonu

Abstract

The formation of mucilage observed in the sea surface and bottom sediment in the Marmara Sea in the first half of 2021 adversely affected the aquatic ecosystem aesthetically and ecologically. The mucilage layer formed on the surface, which prevents oxygen entering the water, was first removed with sea sweepers and vacuum trucks. Due to the hydrophilic nature of the mucilage removed by vacuum trucks, the high water content limits the application of disposal/recovery processes. Therefore, the water must be removed first. In this study, coagulation and centrifugation processes were applied to remove the water of mucilage biomass collected from the sea surface with vacuum trucks. The coagulation process is optimized to provide a good suspended solids settling rate and low turbidity in the supernatant with low operating cost, while the centrifugation process is optimized to provide low turbidity and low operating cost. Optimization was implemented with the Taguchi Experimental Design approach. In the coagulation process, 85 ml of precipitated solid, 8.28 NTU supernatant turbidity and 0.594 Euro/L operating cost were determined in optimum conditions (FeCl3 dose of 0.5 g/L, pH of 11.5, slow mixing of 30 rpm 5 minute and fast mixing of 100 rpm 5 minutes) has been obtained. In the centrifugation process, 180 NTU supernatant turbidity was obtained at an operating cost of 0.042 euro/L at optimum conditions of centrifugation speed of 3500 rpm for 30 minutes. With the Pareto analysis performed for the coagulation process, it was determined that the most effective parameters in coagulation were fast and slow mixing times and pH.

Energy production from mucilage biomass and reduction of azo dye in microbial fuel cells

“…Müsilaj biyokütlesi hidrofilik yapıda olup, katı içeriğinin artırılması, kütlede tutulan suyun salıverilmesi oldukça güçtür [12]. Bunun yanı sıra mikroflora yapısındaki hücre içi değerli maddelerin oranının yüksek olması sebebi ile bu biyokütlenin faydalı kullanım alanları mevcut olmasına karşın, içeriğinde denizel ortamda mevcut olan mikroplastikleri, organik ve inorganik kirleticileri barındırmasından dolayı pek çok faydalı alanda kullanımı sınırlanmaktadır.…”