Abstract
Water hyacinth is one of the rapid growth rate water weed in Rawapening Lake. Water hyacinth contains high hemicellulose which can be used for biogas production. This.,research aims to.,know.,the optimum value of total.,solid (TS), C/N.,ratio and microbial consortium for the biogas production with SS-AD from water hyacinth. The variations used for TS are 15%, 27.5%, and 40%, for C/N ratio are 20, 35, and 50, for microbial consortium are 3%, 6%, 9%. Sixteen reactors of 2 litres volume used with the variations inside are determined by Central Composite Design in Statistica software. Results of the biogas production are then analysed using Response Surface Methodology for optimization. Based on the analysis, the optimum value of TS is in the range of 5%-10%, value of C/N ratio is 32.09, and microbial consortium is 7.26%. Reactor 10 with the TS 5.45%, C/N ratio 35, and microbial consortium 6% has the closest value to the optimum value. The production rate of reactor 10 then analysed using Polymath 6.0. The constant kinetics rate of biogas (U) production rate is 1.88mL/g TS day; maximum biogas production is 108.41 mL/g TS; the minimum.,time to form the biogas is 8.87 days.
Highlights
Water Hyacinth (Eicchornia crassipes) is a type of weeds with a very fast growth and has become a big problem for some water bodies in Indonesia one of them is Rawapening Lake
Water hyacinth has been used for various things, one of them is for producing biogas because it has a considerable hemicellulose content compared to another single organic component [8]
Based on the previous research, the highest production of biogas from water hyacinth will be obtained if the C/N ratio is 30 [5], and the total solid content of 17,67% for SS-AD method [3]
Summary
Water Hyacinth (Eicchornia crassipes) is a type of weeds with a very fast growth and has become a big problem for some water bodies in Indonesia one of them is Rawapening Lake. Various researches have been conducted before about the effect of some variables such as C/N ratio, F/M ratio, and total solid for the biogas production. Based on the previous research, the highest production of biogas from water hyacinth will be obtained if the C/N ratio is 30 [5], and the total solid content of 17,67% for SS-AD method [3]. Microbial consortium such as Streptomyces sp., Trichoderma sp., and Geobacillus sp. Those microbes help to degrade cellulose, hemicellulose, lignin and kittin [1, 12, 6]
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