Sludge disappearance system that used ozone



System outline
It can cause to turn it disappearance without putting out outside the reaction system with the dehydration etc. of sludge and be returned and circulate to reaction tank (oxidation ditch tank), after the surplus sludge that was drawn out from the final deposit pond contacted it with ozone sludge processing equipment.
The surplus sludge is changed to the form, so-called creature dissolution possible organic matter that the microorganism is easy to eat by the strong oxidization action of ozone and be returned to reaction tank. The surplus sludge that was processed ozone is done that decreases disappearance, and be disassembled to carbonic acid gas water by the microorganism with reaction tank. The creature dissolution rate of the sludge that was processed ozone 1 degree is about 30/100. Therefore, it assumed that it is sufficient to perform the ozone processing of 100/30 times (about 3.4 times), to cause surplus sludge turned all the disappearance. In other words, the complete disappearance of surplus sludge becomes possible, by circulate and return to reaction tank and process ozone and draw out 3.4 double the quantity of of occurrence surplus sludge.
While is continued operation with the occurrence zero of surplus sludge from October, 1996, (the 1998 year May present)
Characteristic/consideration item
The outside the room carrying out/final disposal etc. of the sludge is unnecessary. ) Because (surplus sludge does not occur
The sludge dehydration processing is unnecessary. (The same as the above)
Sludge strage tank is unnecessary. (The same as the above)
The deodorization machine of the sludge processing is unnecessary. (The same as the above)
Although the sludge disposal expense becomes unnecessary the electric power expense of ozone occurrence device etc. is linked. However, it is more inexpensive than a disposal expense.
Although BOD, SS of processing water are equal/consists high about 6 mg COD l more law conventionally.
Because I do not do sludge headhunting carrying out the grasp of phosphor is not produced.
It does the supply quantity of the oxygen that needs it to the dissolution of ozone processing sludge to, reaction tank increase quantity. The electric power expense of airator increases.
The used ozone measure must be taken. It discharges it into the atmosphere after processing, with the catalyst (manganese), activated carbon.
Joint research (the Japanese sewerage corporation, Nakanojo-machi, Kurita Water Industries Ltd.)
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