The tofu industry might be classified into small scale
industry, thus the waste treatment needed should be
simple, low operational cost and high economical value.
The anaerobic digester which decays the TLW into
biogas is considered to be qualified with such
requirements. Beside producing the odorless liquid, the
produced biogas might replace the wood or the oil
employed in the processing of the soybean into tofu.
The remaining liquid waste still has the organic content
which might be utilized for the alternative energy. The
anaerobic degradation is the natural process which
might digest the organic matter. The anaerobic process
is conducted in the close system on a certain time
depend on the character of biomass. Innovation on the
digester design which is suitable to the decay time is
needed to obtain the optimum results (Goendi et al.,
2008). Such opportunity has not been optimally utilized
as the TLW could not be directly employed as the
biogas substrate by considering the high nitrogen
content. Novita (2009) reported that the TLW had the