Base on the end of 1998, 161,160,000 ton/day of sewage from 114 sewage treatment station all over the county is producing average 5,220 ton/day of dehydrate sludge which is disposed by mere landfill and cast away in the sea, Recently Che ministry of environment is regulating such a landfill of organ...
Base on the end of 1998, 161,160,000 ton/day of sewage from 114 sewage treatment station all over the county is producing average 5,220 ton/day of dehydrate sludge which is disposed by mere landfill and cast away in the sea, Recently Che ministry of environment is regulating such a landfill of organic sludge Such a landfill of organic sludge. Accordingly sanitary and environmentally friendly manner method treatments are requested order the this circumstances, plasma pyrolysis gasification vitrification treatment known to best for environment has tried to prepare design to optimize the method. To set basic average representing figure for sewage dehydrate sludge, sludge gathered from 4 Seoul sewage treatment station was tested. The representing figure based on test such as ash output test after incinerating have come out as follows; moisture content 75%, ash component 57,70%, carbon 33.30%, hydrogen 3.72%, oxygen 11.70%, nitrogen 331%, sulphur 1.04%, chlorine 0,01%, based or above data, we can calculate by Dulong's method with DS basis as follows; High heat produced 2.373Kca1/Kg(DS), low heat produced -236kcal/Kg We figured out required heat(torch heat) according to input oxygen density. The energy saving was depended on input oxygen density. However high moisture of sewage sludge diminished the effects. We also estimated required energy to dry dehydrate sewage sludge from 75% to 20% In moisture and come to conclusion that optimum design effect was obtainable under the condition of 30% moisture with 85% oxygen input. The design factor are as below; Treatment Capacity. Demanded power is 0.45㎿ for plasma torch based on 50ton/day(2,100Kg/hr) and required power is 0.202Kw/Kg, reacted temperature 1,450℃, required oxygen 59,30cfm, heat produced 1,361 Kca1/㎥. If we refine gas, 363㎥/hr of gas is produced with CO 57.44%, H2 31.75%, heat occurred 2,591Kcal/㎥ and outlet heat enabled to obtain steam if 1,800Kg/hr which would be helpful to design economical facility.
Base on the end of 1998, 161,160,000 ton/day of sewage from 114 sewage treatment station all over the county is producing average 5,220 ton/day of dehydrate sludge which is disposed by mere landfill and cast away in the sea, Recently Che ministry of environment is regulating such a landfill of organic sludge Such a landfill of organic sludge. Accordingly sanitary and environmentally friendly manner method treatments are requested order the this circumstances, plasma pyrolysis gasification vitrification treatment known to best for environment has tried to prepare design to optimize the method. To set basic average representing figure for sewage dehydrate sludge, sludge gathered from 4 Seoul sewage treatment station was tested. The representing figure based on test such as ash output test after incinerating have come out as follows; moisture content 75%, ash component 57,70%, carbon 33.30%, hydrogen 3.72%, oxygen 11.70%, nitrogen 331%, sulphur 1.04%, chlorine 0,01%, based or above data, we can calculate by Dulong's method with DS basis as follows; High heat produced 2.373Kca1/Kg(DS), low heat produced -236kcal/Kg We figured out required heat(torch heat) according to input oxygen density. The energy saving was depended on input oxygen density. However high moisture of sewage sludge diminished the effects. We also estimated required energy to dry dehydrate sewage sludge from 75% to 20% In moisture and come to conclusion that optimum design effect was obtainable under the condition of 30% moisture with 85% oxygen input. The design factor are as below; Treatment Capacity. Demanded power is 0.45㎿ for plasma torch based on 50ton/day(2,100Kg/hr) and required power is 0.202Kw/Kg, reacted temperature 1,450℃, required oxygen 59,30cfm, heat produced 1,361 Kca1/㎥. If we refine gas, 363㎥/hr of gas is produced with CO 57.44%, H2 31.75%, heat occurred 2,591Kcal/㎥ and outlet heat enabled to obtain steam if 1,800Kg/hr which would be helpful to design economical facility.
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