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Speaker of A Net-Zero Future for High-Tech Facility

王世賢, Shawn Wang


Circular Economy Division, Retech Environmental Solutions Co., Ltd.


    Department of Civil Engineering of National Central University / Master


    Enviro-Innovate Tech Co., Ltd./ Vice president
    Trans Energy Technology Co., Ltd./ Vice president
    LEVEL A Qualified for technical personnel of waste treatment

Speech Title and Abstract

Urban Mining From Industrial wastewater – Take Ammonium Sulfate and Cryolite as example

    The introduction of advanced semiconductor manufacturing processes has increased the use of chemicals
    substantially, so waste recycling is imperative. In order to solve the problem of ammonia nitrogen wastewater,
    some semiconductor factories use MD (membrane deaerator) membranes to separate ammonia nitrogen from the
    wastewater and use sulfuric acid to absorb the ammonia sulfate waste liquid with a concentration of about 30wt%,
    and then transport it to a reuse factory for treatment. A crystallization system is set up in a semiconductor factory to
    convert it into industrial ammonium sulfate in this project. The specifications of industrial ammonium sulfate include
    particle size requirements. Therefore, DTB (Draft Tube Baffle) molding system that can meet both industrial
    ammonium sulfate caliber (>0.5mm) and real-time height is adopted, at the same time, a mechanical vapor
    recompression system (Mechanical Vapor Recompression, MVR) is used to save energy in the evaporation
    system, reducing energy consumption by more than 80%. This is an ammonia nitrogen wastewater resource
    recycling system that takes into account space, product specifications and energy saving.
    The general practice is to outsource the removal of hydrofluoric acid waste liquid from semiconductor
    plants to a recycling plant and convert it into metallurgical grade fluorite for the steel industry. In this project, a
    system for converting hydrofluoric acid waste liquid into cryolite is installed in the factory to supply flux to the
    aluminum smelting industry, which can achieve the benefits of reducing waste, reducing safety hazards in
    transporting hydrofluoric acid waste liquid to reuse plants, and increasing product value. This project also won the recognition of the 3rd Green Chemistry Application and Innovation Award.
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