First full-scale combined MBBR, coagulation, flocculation, discfilter plant with phosphorus removal in France

Pille Kängsepp, M. Sjolin, A. G. Mutlu, B. Teil, C. Pellicer-Nacher

    Research output: Contribution to journalArticlepeer-review

    6 Citations (Scopus)

    Abstract

    The suspended solids (SS) concentrations in effluent from moving bed biofilm reactors (MBBRs) used for secondary biological treatment can be up to 500 mg/L. Microscreens (Drumfilters or Discfilters) can be used as alternatives to traditional clarification or dissolved air flotation to remove SS and total phosphorus (TP). This study shows how a small-scale municipal WWTP for 5,700 population equivalent (PE) can be upgraded to 12,000 PE by combining MBBR with coagulation-flocculation tanks and a Discfilter with a total footprint of 160 m(2). This long-term investigation demonstrated that even though influent turbidity (range 146-431 NTU) and flow (25-125 m(3)/h) varied considerably, very low effluent turbidities (below 10 NTU) could be achieved continuously. Furthermore, this compact treatment system can provide average reductions of ammonium (NH4-N) from 19 to 0.04 mg/L, COD from 290 to 10 mg/L, and TP from 4.5 to 0.3 mg/L. The results show that effluent requirements can be reached by combining MBBR, coagulation-flocculation and disc filtration at full scale, without a primary clarifier upstream of MBBR.

    Original languageEnglish
    Pages (from-to)19-27
    Number of pages8
    JournalWater Practice and Technology
    Volume15
    Issue number1
    DOIs
    Publication statusPublished - 2020

    Swedish Standard Keywords

    • Engineering and Technology (2)

    Keywords

    • coagulation
    • flocculation
    • microscreen
    • moving-bed biofilm reactor (MBBR)
    • phosphorus
    • suspended solids

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