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Sappi case history : Anaerobic-Aerobic Treatment of Sulfite Pulp and Paper Mill Effluent


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Anaerobic-Aerobic Treatment of Sulfite Pulp and Paper mill effluent using high Performance Levapor Carriers for the immobilization of micro-organism. A significant AOX reduction was observed and discharge limits for AOX emission were met successfully providing 80-85% COD reduction with useful bio gas generation for fuel.

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Sappi case history : Anaerobic-Aerobic Treatment of Sulfite Pulp and Paper Mill Effluent

  1. 1. LEVAPOR SAPPI- a case history LEVAPOR GmbH, Leverkusen
  2. 2. SAPPI – Ehingen (Germany) - Biotreatment of toxic pulp mill effluents by LEVAPOR-fixed biomass.
  3. 3. SAPPI- a case history APPI , Ehingen (Germany) : 90.000 t/yr pulp (1985) ite pulp and paper mill, ching with chlorine. 00 m³/d pulp mill waste water, ons/day COD, c effluents. tests for aerobic biotreatment had achieved only COD removal (toxicity of bleaching effluents !). : anaerobic-aerobic treatment ? tests with LEVAPOR- fixed biomass.
  4. 4. Effect of carrier types on COD-elimination under anaerobic LEVAPOR activated carbon unmodified PUR carrier suspended anaerobic culture
  5. 5. Vana =65.000 m³ Vana =20.000 m³ Vana =15.000 m
  6. 6. SAPPI- case history Solution: anaerobic pre-treatment using 1500 m³ LEVAPOR  66-70% COD-removal. Aerobic post-treatment removed further 50% of residual COD. Anaerobic reactors: only 15.000 m³ instead of 65.000 m with suspended biomass ! Benefits for customer: 50.000 m³ less reactor volume Savings for customer: ~ ca. 12 to 15. mio € investition
  7. 7. BUFFER + BIOCOND. LP MILL 0.000 m³/d ~ 45 t/d ralised ANAEROB- REACTOR LEVAPO R AEROBIC POST TREATMENT CLARIF. for AEROB- REACTOR Excess slud 4-5 t/d ! BIOGAS MIXED EFFLUENT Q ~ 13.500 m³/d SAPPI – basic process flow diagram
  8. 8. rder to confirm again the contribution of LEVAP film Technology, for plant startup only two erobic ctors had been filled each with 12 % carrier. er four months after toxic shocks the minor stab ctor with suspended biomass became inhibited a more able to recover prior bioactivity, proving th ortance of immobilisation (next graph).
  9. 9. y 90 June 90