This document discusses utilizing liquid waste biogas from livestock manure as an alternative electrical energy source through microbial fuel cell (MFC) technology. MFCs can convert complex organic materials in waste into electrons through microbial metabolism. The study aimed to characterize the electrical energy generated from liquid waste biogas using an MFC system and investigate changes in biogas substrate properties after MFC use. Testing showed the biogas had high COD and BOD levels. An MFC system produced over 1,000 mV of power, while a two-chamber MFC using different electrolytes produced over 1,000 mV and 0.1 mA of current. MFC treatment reduced organic matter, COD, BOD, and nitrogen levels in

1. UTILIZATION LIQUID WASTE BIOGAS FROM LIVESTOCK MANURE AS AN
ALTERNATIVE SOURCEOF ELECTRICAL ENERGY THROUGH THE TECHNOLOGY
OF MICROBIAL FUEL CELL (MFC)
ALWAHAB
FICI 08 009
ABSTRACT
Study of utilization liquid waste biogas from livestock manure as an alternative source of
electrical energy through the technology of Microbial Fuel Cell (MFC) is technology that can
convert complex organic materials in waste to produce electrons through the process of
microbial metabolism. Purpose of this study is to know the characteristics and greater than
the electrical energy which can be generated liquid waste biogas through the system of MFC,
And to investigate the changes in the characteristics of wastewater biogas substrate after the
use of MFC and to know the characteristics of MFC bacteria. The results showed that the
characteristics of liquid waste biogas include COD levels of 1001.92 mg/L, BOD is 805.54
mg/L, content of organic matter in the form of an average organic C is 7.76%, total nitrogen
is14, 00% and C/N ratio is 0.55. MFC one-room system can generate electric power to a
maximum of 1302.2 mV, whereas MFC two-room system using KMnO4 electrolyte at 1084.3
mV and electrical current of 0.1 mL. and MFC system using K2Cr2O4 two rooms at 1675.8
mV and an electric current of 0.99 mL. Showing results MFC substart characteristics that
decrease the organic matter content substart after discharging wastewater biogas is MFC
COD levels be 500.96 mg/L, BOD be 300.23 mg/L, organic C to 2.68%, total nitrogen 2.27%
and C/N ratio of 1.18. Characteristics of MFC bacteria from wastewater biogas largely Gram-
positive and cocci (round), where there is only one form of isolates of Gram-negative bacteria
is isolates S1.1 with cell-shaped bacilli (rod).
Keywords: Liquid waste biogas, energy, MFC