Experimental investigation and modelling the effect of humic acid on coagulation efficiency for sludge blanket clarifier

Chemosphere
Kanika SaxenaAditya Choudhary

Abstract

The physicochemical process of coagulation has largely been used for turbidity removal for water treatment. However, lately, the intrusion of NOM (Natural organic matter) in the surface water sources due to climate change has impeded the dosing approaches and has presented a requirement to evaluate the effect of NOM on turbidity removal efficiency and the performance of coagulation reactors in general. In this work, a previously developed performance model for hydraulic flocculators was modified and tested for a sludge blanket clarifier (SBC) which is a type of hydraulic flocculator. The experimental runs were conducted by preparing synthetic sample waters by using humic acid (for NOM) and kaolin clay (for turbidity). PACl (Poly aluminium chloride) was used as a coagulant. The expression of attachment efficiency has been modified to include the interactions of humic acid (HA) and kaolin, which were not previously accounted for in the model. The coverage functions were used to calculate the attachment efficiency of HA-PACl and PACl-Clay. The standalone coverage function ГPACl-HA efficiently predicted the doses where the removal efficiency was maximum. However, the coverage function ГClay-PACl was impacted by the hydrodynamic con...Continue Reading

References

Dec 31, 2002·Environment International·Anu MatilainenTuula Tuhkanen
Feb 24, 2017·Water Research·Yoshimasa Watanabe
May 29, 2019·Water Research·Junias Adusei-GyamfiJustine Criquet

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