CASE
Valuable Element Recovery and Zero Liquid Discharge Case Study

Issue

We want to recover valuable elements in wastewater. Or want to make the wastewater Zero Liquid Discharge (ZLD).

● When recovering valuable elements from wastewater
Simply concentrating wastewater results in poor purity of the recovered valuable elements because impurities in the wastewater are also concentrated. It is possible to recover valuable elements with high purity by crystallizing and extracting only the valuable elements.
※There is another method to increase the purity of valuable elements by crystallizing impurities and then removing them.

【Applicable examples】
• Recovery of boric acid
• Recovery of ammonium chloride
• Removal of sodium sulfate in ammonium sulfate
• Removal of NaCl in glycerin

● When converting the wastewater to Zero Liquid Discharge (ZLD)
Directly drying saturated solutions of wastewater using a dryer consumes an enormous amount of energy, so an energy-saving crystallizer that uses an ejector or heat pump is recommended.

【Applicable examples】
• Leachate treatment
• Thermal power generation desulfurization wastewater treatment

Benefits of Introduction

• Energy-saving equipment is available, including evaporative concentration in the previous process
• Energy-saving crystallizers are available
• Recovery of valuable elements with high purity, including various pretreatments
• It is possible to provide comprehensive proposals, including seed crystals to prevent scaling, and selection of separator and dryer

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