Scraped Surface Crystallizer - High-Load Solid/Liquid Crystallization & Drying System

Scraped Surface Crystallizer - High-Load Solid/Liquid Crystallization & Drying System

The Scraped Surface Crystallizer is engineered for wastewater streams where conventional evaporation or crystallization systems struggle due to scaling, fouling, or high solids content.

The rotating scraper continuously removes deposits from the heat transfer surface, ensuring stable heat exchange and controlled crystal growth during long-term operation.

Key Features

• Continuous scraping mechanism to prevent scale buildup
  
• Forced circulation design for uniform crystallization
  
• Efficient heat transfer under high solid and high viscosity conditions
  
• Integrated drying section to increase final solid dryness
  
• Compact layout for industrial installation

System Placement

• Installed downstream of MVR or other evaporative concentration units for final drying

• Used as a finishing stage in zero liquid discharge (ZLD) systems to produce handleable solid waste

• Positioned after primary waste concentration or membrane units to reduce volume

 

Typical Applications

• Concentrated brine and mother liquor from evaporators

• High-hardness wastewater from chemical and industrial processes

• High-viscosity waste streams such as pesticide, lithium battery wastewater

• Landfill leachate and complex mixed waste requiring solidification

 

Scraped Surface Crystallization & Drying Process Overview

Step 1 – Concentrated Feed Introduction

High-salinity or high-solid wastewater is fed into the crystallizer under controlled flow.

Step 2 – Heat Transfer & Crystallization

Heat is transferred through scraped surfaces while crystals form in the circulating slurry.

Step 3 – Continuous Scraping

Rotating scrapers remove deposits from heat exchange surfaces to prevent fouling.

Step 4 – Solid–Liquid Separation

Crystallized solids are concentrated and separated from the liquid phase.

Step 5 – Drying & Discharge

Solids are further dried to reduce moisture content before discharge or disposal.

Technical Specifications

The following performance data is based on standard testing conditions. Actual performance may vary depending on feed water quality and operating parameters.

Note: Performance data are based on standard operating conditions (20 h/day, 300 days/year). Actual results may vary depending on feed characteristics and site conditions.