Nippon Denko

Aqua Solutions

Aqua Solutions Business

We contribute to the achievement of a sustainable society in this business by providing wastewater treatment equipment that purifies and recycles wastewater to promote water and resource recycling in addition to pure water production equipment that supplies the high-purity water required for cutting-edge technologies.

Wastewater Treatment Equipment (Clean Recycle Technology)

Our wastewater treatment equipment is packed with ion-exchange resin and other adsorbents. The consignment regeneration scheme at our Koriyama Plant makes it possible to recycle water and recover resources.

Wastewater Treatment Equipment (Clean Recycle Technology)

1. Purifying and reusing water and chemicals

  • Wastewater can be reused as deionized water or pure water.
  • When impurities are removed from the chemical solutions used in plating and other industrial processes, the solutions last longer and the water can be reused.

2. Consignment regeneration scheme

  • No need for customer maintenance or chemicals for regenerating ion-exchange resin.
  • No sludge is generated from wastewater treatment.
  • Consignment regeneration of wastewater treatment equipment involves maintaining the equipment. Furthermore, the water treatment equipment does not constitute waste.

3. Recycling resources

 Recycling resources

4. Sales method

5. Stable performance and robust after-sales service

Pure Water Production System (Pure Water Technology)

Demand for high-purity water (for cleaning, mixing, inspections, and other uses) continues to rise as industrial products become more advanced. Pure water is also used to produce hydrogen, which powers fuel cell EVs and thus is regarded as an essential part of the effort to achieve carbon neutrality. Our AQUA PACK pure water production equipment is a simple pure water system packed with ion-exchange resin, and it is capable of creating high-purity water by removing impurities from tap water.
Our MR PACK (pure water production equipment)-reverse osmosis (RO) membranes paired with AQUA PACK (ion-exchange resin tower)-is used at most of the on-site hydrogen stations in Japan, thus facilitating the shift to a hydrogen-based society.

Main applications

  • Hydrogen production (hydrogen stations, Ene-Farm home-use fuel cells)
  • Washing cars
  • Surface treatment washing (plating, coating, etc.)
  • Boilers, air conditioning and humidifiers
  • Experiments and analysis


  • Wastewater Treatment Equipment

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        40 150 350 550 700
      Model 40 150 350 550 700
      External dimensions Φ360×H947mm Φ600×H1,410
      Operating weight 65 kg/tower 260 kg/tower 600 kg/tower 900 kg/tower 1,200 kg/tower

      Main applications and features

      • Treatment of wastewater containing chrome and other metals
      • Removal of impurities from plating solution, etc.
      • Rinse water for surface treatment, etc.
      • In-situ treatment of contaminated soil and groundwater
      • Removal of coloring and chemical organic demand (COD) from other types of wastewater

      Main customers (lines of business)

      Plating, coating, auto parts manufacturing, aircraft parts manufacturing, electronic parts manufacturing, machine parts manufacturing, platemaking and printing, construction machinery manufacturing, chemical manufacturing, steelmaking, mining, construction (treating soil/groundwater contamination), environmental cleanup, waste disposal plants, landfills

      Models and Specifications

      Tower type Features of ion-exchange resin
      S Selective removal of Cr(VI)
      G Removal of cations of Cr(III), Pb, Cu, Zn, etc.
      H Refining of liquids, mainly by removing ions of Fe, Cu, etc. from Cr(III) solutions
      O Removal of anions of Cr(VI), SO4, Cl, NO3, etc.
      A Removal of Cr(VI), SO4, F, and other elements as well as slightly acidic ions of SiO2, CO2, etc.
      M Total removal of ions of Na, K, Ca, SiO2, CO2, etc.
      C Removal of organic matter and COD components
      Model Total exchange capacity (approximately) (Eq/tower) Volume of ion-exchange resin (L/tower) Standard flow rate (m3/h) Treatment capacity (m3/tower)*
      CR-40 40 30~40 ≦0.5 40
      CR-150 150 90~140 ≦2 150
      CR-350 350 220~330 ≦4 350
      CR-550 550 400~520 ≦4 550
      CR-700 700 500~690 ≦10 700

      * Treatment capacity is based on pre-treatment water quality with Cr(VI) = 52 mg/L, CaCO3 = 50 mg/L.

      Title of source material Cr6+ SO4 Na CI pH Conductivity
      mg/L μS/cm
      Washing water for chromium plating 35 12 14 8 6.1 300


      Wastewater after treatment by an ND MINICHROPACK system Cr6+ SO4 Na CI pH Conductivity
      mg/L μS/cm
      Washing water for chromium plating <0.01 <0.1 <0.04 <0.1 <5.8 2

      HH model, removal of iron ions from trivalent chromium solution

      Treated wastewater quality
      SS   Selective removal of Cr(VI)
      Acid water (containing chloride ions) cannot be reused
      AA Alkaline, neutral, and acid water
      Adsorption and removal of all anions
      GG Removal of acid water Cr(III), Al, Fe, etc.
      Refining of plating solutions, etc.
      HH Refining of solutions
      Mainly removal of Fe and Cu from Cr(III) solutions
      GO Deionized water
      Electric conductivity ≧ 2 μS/cm
      GA Pure water
      Electric conductivity ≧ 0.2 μS/cm
      GOM High-purity water
      Electric conductivity ≧ 0.055 μS/cm
      GAM High-purity water
      Electric conductivity ≧ 0.055 μS/cm
      MM High-purity pure water
      Electric conductivity ≧ 0.055 μS/cm
      C Activated carbon tower
      Removal of organic matter and COD components

      The figures are not guaranteed as the quality of treated water is subject to change based on the composition of pre-treatment water and other factors.

      • SS model
      • GOM/GAM model
      • GO/GA model
      • H model
      • MM model
      • CC model


      Yes, ion-exchange resin can be regenerated and reused over and over. Different chemical solutions are used to regenerate different types of ion-exchange resin.

      Generally through reduction treatment using sodium bisulfite or the like, or adsorption and removal using ion-exchange resin.

      The term refers to the way ion-exchange resin in solutions containing multiple elements triggers ion exchanges with certain elements over others.
      Highly acidic ion-exchange resin (H model) selects ions in the following order:
      Cr3+ > Al3+ > Pb2+ > Fe2+ > Ca2+ > Ni2+ > Cu2+ > Zn2+ > K+ > NH4+ > Na+ > H+

Inquiries about Aqua Solutions Business

  • For inquiries by phone


    Aqua Solutions Marketing Dept.

  • For inquiries via email

    Contact Form
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