Asian Paints Limited
Paint Sludge Drying Case Study
Paint Sludge Drying Results at Asian Paints
This paint sludge drying case study shows how Thermarex helped Asian Paints in Visakhapatnam dry pigment-rich biological sludge in a compact, manually operated Solar Sludge Dryer on just 73 m².
Project Overview
Industry: Paint & Coatings Manufacturing
Sludge Type: Biological sludge
Capacity: 0.5 TPD
Technology: Solar Sludge Dryer (Manual System)
Facts and Figures
The Paint Sludge Drying Challenge
- Sludge generated from paint industry contains pigments, binders, and fine suspended solids, making drying behavior inconsistent
- High initial moisture (~75%) leading to bulky sludge and frequent disposal
- Limited available footprint (73 m²) restricting system size
- Small capacity plant where automation would increase cost disproportionately
- Requirement for cost-effective drying without complex systems
The Solution
- Installation of compact Solar Sludge Dryer optimized for small footprint
- Manual operation mode selected to eliminate unnecessary automation cost
- Greenhouse-based drying using solar radiation
- Natural air circulation for moisture removal
- System designed for low throughput with high efficiency
Results & Benefits
- Achieved >85% moisture reduction despite compact system
- Significant reduction in disposal frequency and logistics cost
- Low CAPEX and optimized OPEX due to manual design
- Stable drying performance for pigment-based sludge
- Suitable benchmark for small-scale industrial installations
Why the Solar Sludge Dryer?
For a small 0.5 TPD stream, automation would have added cost out of proportion to the load. A manual Solar Sludge Dryer uses free solar energy and only about 50–100 units of power a day, while still taking pigment sludge from ~75% to below 10% moisture. Explore the Solar Sludge Dryer →Paint Sludge Drying: Frequently Asked Questions
Can solar drying handle paint sludge?
Yes. Paint sludge contains pigments, binders and fine solids that dry inconsistently, yet the Asian Paints system achieved more than 85% moisture reduction with a greenhouse-based solar dryer. Paint sludge is often classified as hazardous, so dried output must follow CPCB rules for disposal.
How much space does paint sludge drying need?
At Asian Paints, a 0.5 TPD solar system fits in 73 m². Larger loads need more drying area, which we size from your sludge quantity, moisture and local climate.
Is a manual solar sludge dryer worth it for small plants?
For small volumes, yes. Manual operation avoids automation cost, keeps CAPEX low and still delivers stable drying and far fewer disposal trips.
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