Success Stories
Sodium Sulphate Recovery for Caustic Soda Plant in Dahej, Gujarat
Challenge
A prominent chemical manufacturer in Dahej, Gujarat, faced significant environmental and operational challenges due to sulphate-rich effluents produced during caustic soda manufacturing. The high concentration of sulphate ions posed a risk to compliance with pollution control norms and led to increasing disposal costs. Traditional treatment methods were ineffective in recovering useful byproducts or reducing the environmental impact.
Solution
Geist engineered and commissioned India’s first Sodium Sulphate Recovery System tailored specifically for the caustic soda sector. The system was designed to:
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Recover high-purity sodium sulphate (>99%)
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Reduce the sulphate load in the effluent stream
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Enable resource recovery aligned with circular economy principles
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Integrate with a Zero Liquid Discharge (ZLD) system for total water recovery
Approach
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Site Assessment & Effluent Analysis
Geist conducted a comprehensive audit of the plant’s effluent characteristics and production processes.
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Custom System Design
A tailored recovery system was developed using crystallization and solid-liquid separation technologies to isolate sodium sulphate from the effluent.
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Pilot Testing & Optimization
Small-scale trials were conducted to validate process parameters before full-scale deployment.
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System Integration & Commissioning
The recovery unit was integrated with existing infrastructure and a ZLD setup, ensuring minimal environmental discharge and maximum resource recovery.
Metrics & Impact
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✅ 99%+ purity achieved in recovered sodium sulphate
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💧 Zero Liquid Discharge realized, ensuring full regulatory compliance
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♻️ Waste-to-value transformation of sulphate-laden effluents
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💰 Significant reduction in disposal costs and new revenue stream from recovered salt
