QUESTION 11 On their website, Janicki Bioenergy gives limited technical informat

Question

QUESTION 11 On their website, Janicki Bioenergy gives limited technical information relating to two versions of their Omni Processor technology for converting 'sewer sludge' into electricity and potable water. A key feature of this technology is that the process is self-sufficient in terms of energy. In fact, the energy obtained by burning the dry fuel (i.e. the solid portion ofthe sewer sludge is enough to meet all processing requirements with excess energy being exported as electrical power. No process flow diagram is provided by the company, although it can be assumed that significant engineering thought has gone into recovering as much of the heat from the burnt fuel as practical. It may be assumed that 'sewer sludge' is the combined material (ie. both faeces and urine) gathered in a pit latrine where minimal washing and/or dilution water has been used. Published data on the Internet gives the following ranges for human waste production o Wet faeces 140 to 260 glperson/day o Dry faeces 40 to 80 g solids/person/day o Urine- 1.0 to 1.4 kg/person/day o Solids content of urine-50 to 70 gperson/day For the larger (S200) Omni Processor model, the following information is given on the company website: Maximum rate at which sewer sludge can be processed 92.3 m per day Maximum moisture content of sewer sludge-91% Maximum potable water production rate -86,000 litres per day

Explanation / Answer

Mn = ((Ww-Wd)/Ww) x 100
in which:
Mn = moisture content (%) of material n
WW = wet weight of the sample, and
Wd = weight of the sample after drying.

WW = wet weight of the sample = 140-260 = on an averge = (140 + 260)/2 = 200

Wd = weight of the sample after drying = 40-80 = on an average = (40 + 80)/2 = 60

there fore Mn = moisture content (%) of material n= 200 -60/60 * 100 = 233 .33 %

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