| 摘要 |
PROBLEM TO BE SOLVED: To efficiently prevent the clogging of a membrane in a post step by a simple and inexpensive means by performing the adsorption treatment using an active carbon between both of membrane treatments in the case of carrying out the slid-liquid separation for a waste water treated biologically and adding a flocculant into a permeating liquid of a membrane and then performing the adsorption treatment. SOLUTION: A high concentration organic waste water 1 is introduced into a biochemical nitrification and denitrification tank A and biologically treated. Air as an oxidation substance containing gas 2 is introduced into the nitrification and denitrification tank A. A flocculant auxiliary 12 or the like is added into an active slurry 3 overflowed from the nitrification and denitrification tank A and treated in a membrane separating device B in a foregoing step. At that time, a membrane permeating liquid 5 is treated in an active carbon adsorption treatment equipment K and then phosphorus removal is carried out by a phosphorus removal device C. A phosphorus removal treatment liquid is introduced into a membrane separation device E in the post step to prepare a membrane permeating liquid 7. If necessary, the membrane permeating liquid 7 is introduced into an oxidative decomposition device F and the oxidative decomposition is carried out by a chemical oxidative decomposition agent 17 to prepare a low COD, BOD, a coloring matter containing water and discharged as a treated water 14. |
