# Pilot Study on Nucleation-Induced Pelleting Coagulation in Treatment of High-Algae Surface Water: Coagulant Dosage and Hydraulic Loading Optimization

## TL;DR

This study tests a new water treatment system using a fluidized bed to efficiently remove algae and harmful substances from high-algae surface water.

## Contribution

The study introduces a circulating pelletized fluidized bed system optimized for high-algae water treatment with specific coagulant dosages.

## Key findings

- 20 mg/L PACl and 0.8 mg/L PAM achieved >80% algae density removal.
- The system removed 66.20% of dichloroacetonitrile precursors effectively.
- Performance was consistent across various algal species.

## Abstract

This study proposes a circulating pelletized fluidized bed (CPFB) with micro-sand loading for treating high-algae surface water. Key operational parameters (coagulant dosage, flow rate) were optimized to simultaneously remove algae, turbidity, and disinfection byproduct precursors. Results revealed that 20 mg/L polyaluminum chloride (PACl) and 0.8 mg/L PAM achieved optimal removal of algae (density removal > 80%) and organic matter. The fluidized bed exhibited robust performance across algal species, with the highest dichloroacetonitrile (DCAN) precursor removal of 66.20%, demonstrating superior efficiency for trihalomethane precursors over haloacetic acids. These findings provide critical operational guidance for high-algae water treatment using fluidized beds.