| 摘要 |
PURPOSE:To perform the ultrahigh advanced treatment of organic waste water with the saved consumption of energy, by treating organic liquid waste in the step of biotreatment, mixing oil in the slurry mixture of the biotreated liquid and excess sludge, and then treating it in the step of evaporation. CONSTITUTION:Excretions from which solid matters have been removed is let flow into the step of biotreatment such as a biological nitrifying-denitrifying step without the addition of diluting water, to remove BOD components, etc. from it. Active sludge slurry 3 flowing out of the step 2 of biotreatment is separated into conc. sludge 5 and separated water 5' in the step 4 of separation. The separated water 5' is mixed with slurry 6 containing excess active sludge to form a slurry mixture 7. This slurry mixture 7 is sufficiently kneaded in a mixer tank 9 while adding oil such as heavy oil to it and let flow into the step 10 of evaporation and steam compression. Steam 15 evaporated in the step 10 of evaporation is raised at an elevated temp. in a steam compressor 16, let flow into the indirect heating part 17 of the step 10 of evaporation and reused as a heating source. |
