FRACTIONATION OF EFFLUENT FROM A PULP MILL

Patentradars sammanfattning

Axolot Solutions Holding AB discloses a continuous two-stage fractionation process for kraft pulp mill effluent in which electrocoagulation (EC) using iron electrodes first removes suspended solids, phosphorus, transition metal ions, and wood extractives (sterols, phenols, terpenoids) into a compact, easily dewatered floc fraction. The resulting primary effluent is then passed through one or more biofilm reactors (MBR, MBBR, RBC, or SBR) to biologically degrade residual dissolved organics, yielding a clean secondary effluent (water fraction) and a separate biosludge fraction. Optional downstream reverse osmosis of the water fraction produces a pure water stream for mill reuse and a brine fraction that can serve as fly-ash leaching liquor, with subsequent EC and electrolysis steps recovering metal flocs and make-up chemicals for the kraft recovery cycle. The invention is distinguished from conventional wastewater treatment by its explicit fractionation goal—creating fully recyclable output streams rather than merely meeting discharge standards.

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