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Chlorate adsorption from chlor-alkali plant brine stream
Shyam Lakshmanan1, Thanabalan Murugesan1
1Chemical Engineering Department, Universiti Teknologi PETRONAS, Bandar Seri Iskandar 32610, Tronoh, Perak, Malaysia
Summary
Activated carbon effectively removes chlorate from chlor-alkali plant brine streams. Coconut-based activated carbon showed the best performance, reducing chlorate levels and preventing environmental release.
Area of Science:
- Environmental Chemistry
- Chemical Engineering
Background:
- Chlorates contaminate brine streams from chlor-alkali plants.
- Brine purging releases chlorides and chlorates into the environment.
Purpose of the Study:
- To evaluate activated carbon for chlorate adsorption from brine.
- To identify optimal conditions for chlorate removal and brine recovery.
Main Methods:
- Adsorption tests using activated carbon from coconut shell, coal, and palm kernel shell.
- Comparison of adsorption efficiency and chlorate reduction rates.
Main Results:
- Activated carbon reduced chlorate levels by 1.3–1.8 g/L, exceeding the generation rate of 1.22 g/L.
- Coconut-based activated carbon demonstrated superior chlorate adsorption.
- Optimal placement for adsorption is after brine dechlorination and before resaturation.
Conclusions:
- Activated carbon adsorption is a viable method for chlorate removal from chlor-alkali brine.
- Implementing this process prevents brine purging, enabling full brine recovery and minimizing environmental discharge.
- Coconut-based activated carbon is recommended for its high efficiency.
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