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Related Experiment Video

Updated: Jul 19, 2026

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Two-way Valorization of Blast Furnace Slag: Synthesis of Precipitated Calcium Carbonate and Zeolitic Heavy Metal Adsorbent

Published on: February 21, 2017

Phosphate removal using sludge from fuller's earth production.

Yong Hee Moon¹, Jae Gon Kim, Joo Sung Ahn

¹Department of Earth System Sciences, Yonsei University, Seoul 120-749, South Korea. yhmoon@yonsei.ac.kr

Journal of Hazardous Materials

|October 13, 2006

Summary

Industrial sludge effectively removes phosphate via adsorption and precipitation. Gypsum sludge demonstrated a maximum adsorption capacity of 2.0 g/kg, achieving over 99% removal under optimal conditions.

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Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Extraction of Structural Extracellular Polymeric Substances from Aerobic Granular Sludge

Published on: September 26, 2016

Area of Science:

Environmental Science
Materials Science
Chemical Engineering

Background:

Industrial by-products can offer sustainable solutions for environmental remediation.
Fuller's earth processing generates gypsum sludge, a potential adsorbent material.
Phosphate pollution is a significant environmental concern, necessitating effective removal strategies.

Purpose of the Study:

To evaluate the phosphate removal efficiency of industrial gypsum sludge.
To determine the dominant phosphate removal mechanism (adsorption vs. precipitation).
To characterize the sludge and the resulting precipitates.

Main Methods:

Batch experiments were conducted to test phosphate removal under varying conditions (concentration, pH, time, sludge dosage).
Phosphate adsorption capacity was determined using the Langmuir equation.
Analytical techniques including SEM, XRD, FT-IR, and DTA were employed for material characterization.

Main Results:

The sludge exhibited a maximum phosphate adsorption capacity of 2.0 g/kg.
Optimal phosphate removal occurred at neutral to alkaline pH (7-12).
Over 99% phosphate removal was achieved from a 30 mg/L solution using 0.15 g sludge in 9 hours.
Precipitation of calcium phosphate, specifically brushite, was identified as the primary removal mechanism at high phosphate concentrations.

Conclusions:

Industrial gypsum sludge is a viable material for phosphate removal from aqueous solutions.
Both adsorption and precipitation contribute to phosphate removal, with precipitation dominating at higher concentrations.
The formation of brushite and its potential transformation to hydroxyapatite highlight the chemical processes involved.