(Q11)-G QUESTION 11 on their website, Janicki Bioenergy gives limited technical
ID: 91010 • Letter: #
Question
(Q11)-G
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 of the 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 (i.e. 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 g/person/day o Dry faecesE 40 to 80 g solids/person/day Urine 1.0 to 1.4 kg/person/day O o Solids content of urine 50 to 70 g/person/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 m3 per day Maximum moisture content of sewer sludge 91 Maximum potable water production rate 86,000 litres per dayExplanation / Answer
The disinfection feature normally useful in the method for converting the swere sludge into potable water inolves:
(a) injection of chlorine solution (5 to 15 mg/l)
(b) Ozone and ultra violet (UV) irradiation.
The bactericidal effect of chlorine is dependent upon the pH, contact time, organic content, and the effluent temperature.
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