Reference- Saudi Arabia Manfouha WWTP

2015 Riyahd’s biggest waste water treatment plant, capacity 700000 m3/d

Problem: Severe H2S content and multiple corrosion problems

• High H2S (>400 ppm) content and corrosion problem
• Flow of raw sludge 4000 m3/d (2/3 digested and 1/3 thickened)

Solution: Peroxide system

• The chemical was dosed to raw sludge collection tank (V=500m3)
• H2S online measurements after the sludge centrifuges from reject water

Results:

• Instant reduction on H2S content on collect tank and after the centrifuges
• 24h after the chemical dosage start the target limit (max 10ppm H2S) was reached
• The sulfide content on raw sludge reduced 24 à 8 mg/l