TREATMENT METHOD FOR ORGANIC WASTEWATER OR SLUDGE AND TREATMENT APPARATUS THEREFOR

摘要

PROBLEM TO BE SOLVED: To provide a treatment method for organic wastewater or sludge for markedly improving the recovery of magnesium ammonium phosphate (MAP)1and a treatment apparatus therefor.

SOLUTION: In the treatment method for organic wastewater or sludge having an anaerobic treatment process and a process for taking phosphorus and nitrogen in organic wastewater or sludge out of the system in an MAP form, an Mg source is added to the anaerobic treatment process corresponding to the target amount of MAP to be recovered by the process to form MAP. MAP crystals are separated and recovered from MAP-containing sludge and a part of the sludge is guided to a sludge dehydration process after the recovery of MAP while the remainder of the sludge is returned to the upper part of a reaction tank. A sludge concentrating process and a process for concentrating or dehydrating digested sludge from the anaerobic treatment process are provided to the front stage of the anaerobic treatment process and MAP is formed and recovered from the separated water from the respective processes. The treatment apparatus for this treatment method is also disclosed.

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