MVR Evaporator for Dyeing Wastewater Treatment

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MVR Evaporator for Dyeing Wastewater Treatment

This project utilizes an MVR forced circulation evaporator to treat dyeing wastewater containing high concentrations of ammonium sulfate and organic contaminants. The wastewater is concentrated to a supersaturated state, followed by centrifugal separation to recover ammonium sulfate crystals. The mother liquor is continuously recycled to the evaporator, achieving efficient resource recovery while minimizing wastewater discharge and operating costs.

Equipment: MVR  Forced Circulation Evaporator;

Feed composition: Ammonium sulfate wastewater;

Treatment capacity: 10,000kg/hr;

 Inlet concentration: 13.3 wt%;

Outlet concentration: supersaturated;

Installed Power: 670kw;

Steam consumption: 200kg/hr 

* Steam consumption is limited to the steam required for the mechanical vapor recompressor shaft seal and excludes the steam used during system startup and preheating.

Wastewater Treatment Tags: ,

Description

Project Overview 

This project utilizes an MVR (Mechanical Vapor Recompression) Forced Circulation Evaporator to treat dyeing wastewater containing high concentrations of ammonium sulfate and organic contaminants. The system concentrates the wastewater to a supersaturated state, enabling the recovery of crystalline salts while significantly reducing wastewater volume and operating costs.

The complete system integrates a feed preheater, forced circulation evaporator, evaporative crystallizer, MVR unit, secondary vapor scrubber, centrifuge, and automatic control system, providing a highly efficient and reliable solution for industrial wastewater treatment.

Process Solution    

The dyeing wastewater is first preheated before entering the MVR forced circulation evaporator system. During the evaporation process, water is continuously removed, concentrating the solution until it reaches supersaturated state.

The resulting supersaturated slurry is transferred to a centrifuge for solid-liquid separation. Recovered ammonium sulfate crystals can be reused or collected for disposal, while the mother liquor is recycled back to the evaporator for continuous concentration. This highly efficient process enables resource recovery, minimizes wastewater discharge, and significantly reduces operating costs.

Technical Features  

• High Energy Efficiency

The MVR system recycles secondary vapor as the heating source, dramatically reducing fresh steam consumption and lowering operating costs.

• Optimized Forced Circulation Design

Forced circulation technology provides high liquid velocity through the heat exchanger, effectively preventing tube blockage caused by high-solids wastewater while minimizing scaling and maintaining high heat transfer efficiency.

• Enhanced Compressor Protection

A secondary vapor scrubber is installed upstream of the MVR compressor to remove entrained droplets and impurities, ensuring clean vapor enters the compressor and extending its service life.

• Intelligent Process Control

A fully automated DCS control system enables real-time monitoring, stable operation, and reduced labor requirements.

System Advantages

• High-efficiency treatment of dyeing wastewater containing ammonium sulfate

• Significant reduction in steam consumption through MVR technology

• Efficient recovery of ammonium sulfate crystals

• Reduced scaling and minimized heat exchanger fouling

• Long continuous operating periods with lower maintenance requirements

• Fully automatic operation with reliable process control

• Compact design with low operating and maintenance costs

• Suitable for Zero Liquid Discharge (ZLD) and wastewater resource recovery applications

Main Equipment

•  Feed Preheater

•  Forced Circulation Evaporator

•  Mechanical Vapor Recompression (MVR) Unit

•  Secondary Vapor Scrubber

•  Vacuum system 

•  Centrifuge

•  Automatic Flushing System

•  DCS Control System

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