Other Treatment

Hansung Cleantech is achieving the efficient performance and creating the economic efficiency of the treatment systems through R&D and partnership with suppliers.
Hansung Cleantech achieved the advancement of wastewater treatment methods and the safety of treated water through continuous patent applications for electrolysis technology and offers various applications of the technology such as advanced biological treatment, sludge reduction, disinfection of effluent, and sterilization of red tide algae.
We are providing a vacuum sewage collection and treatment system (Vacuflow) through partnership with QUA-VAC from Canada.
This vacuum sewage collection and treatment system enables economic and efficient construction by being applied to grounds and areas where construction is difficult.

  • Electrolysis Treatment


    The electrolysis process removes and sterilizes the residual organic matters of wastewater through electrocoagulation and decomposition using electrode plates. Furthermore, it can remove non-biodegradable organic matters and nitrogen with no chemical and is stable even in the fluctuating water temperatures. The wastewater treatment method of Hansung Cleantech which contains the electrolysis process has such advantages as advanced biological treatment, sludge reduction, and effluent disinfection, as well as the sterilization of red tide algae, the sterilization of circulating water in fish farms, and substitution for residual chlorine injection technique.

    Principle of Process


    Electrolysis decomposes various contaminants by oxidation and reduction reactions which occur when direct current is applied to the wastewater. It is divided into direct oxidation method which removes contaminants by oxidizing them at the anode and indirect oxidation method which removes contaminants by intermediate organisms.


    Electrocoagulation accelerates the growth of coagulates and adsorbs the flocs while precipitating ionic matters as salts by the electric neutralization of electrons discharged from the electrode, thus separating them by floating with hydrogen and chlorine gases or depositing them.

    Electrolytic Floatation

    Electrolytic floatation removes oil and suspended solids by floating them to the water surface by 10㎛ micro bubbles which are generated from the electrolysis of water.

    Generation of Potential Difference

    This is generated when a direct current is applied to the electrode. A positive (+) potential difference has strong sterilization power for microorganisms.

    Advantages of Electrolysis Process

    Economic Efficiency

    Reduction of maintenance cost through the control of facility investment using existing facilities and the control of power/chemical use by flow and water quality.


    It can be used as pretreatment, post-treatment, and main treatment facility by simple installation in the existing discharge (disinfection) tank.
    Excellent removal of contaminants such as BOD, COD, nitrogen, and phosphorous, and flexible method change is possible.


    Quick response to flow and water quality changes is possible by adjusting the power and chemical input amount.
    Stable treatment efficiency is guaranteed compared to biological denitrification and dephosphorylation.The secondary pollution of the downstream ecosystem is prevented.

    Easy Maintenance

    Automated and unmanned operation is possible.
    Efficiency is guaranteed by electrode cleaning every 6 to 12 months (Cleaning can be done just by spraying diluted HCl solution)

    Characteristics of Electrolysis

    • Lifespan of electrode
      The electrodes of general electrolysis water treatment facilities have short life and require replacement every 6 to 12 months. However, our insoluble electrodes are warranted for 2 year life and can be practically used for 5 years, thus greatly reducing installation and maintenance costs.
    • Electrode intervals
      It is difficult to narrow the intervals of electrodes which have many suspended solids and high viscosity and the electrode interval of 10-20 mm is inevitable, resulting in low electrolysis efficiency and high power consumption. However, our electrodes receive special surface treatment which does not easily generate scales and the electrode interval can be reduced to 5 mm or less, thus increasing electrolysis efficiency and greatly reducing maintenance cost.

    전기분해 수처리 분야

    Oil and water separation by electrolytic floatation

    Perfect oil treatment within the shortest time by electrolytic floatation. Excellent effect for wastewater that has become emulsion as well

    • Waste oil treatment facilities
    • Fishery products processing facilities
    • Wastewater from printing factories

    Treatment of non-biodegradable wastewater

    Removal of non-biodegradable materials with the complex effects of electrolysis, electrocoagulation, and electrolytic floatation

    • Highly-concentration nitrogen wastewater
    • Petrochemical wastewater
    • Landfill leachate

    Electrolytic Disinfection

    Instant sterilization by potential difference and continuous disinfection by the generation of hypochlorous acid

    • Effluent disinfection of sewage treatment plant
    • Disinfection of small-scale water supply system
    • Disinfection of water supply tank

    Advanced electrolysis

    Treatment of BOD, COD, nitrogen materials, etc. by powerful oxidation/reduction

    • Leachate of wastes
    • Ammonia nitrogen wastewater
    • Livestock wastewater

    Electrolysis sludge reduction

    Destruction of sludge cell walls by electrolyzing organic sludge and reduction by destruction of the electric equilibrium between sludges

    • Food wastewater
    • Sewage treatment plant
    • Wastewater with a high concentration of organic mattes from wastewater treatment plants, etc.


    Waste oil treatment, seafood processing high concentration nitrogen wastewater, petrochemical wastewater, wastewater treatment waste leachate, ammonia nitrogen processing
    Oil-water separation by electrolytic floatation, non-biodegradable wastewater treatment, electrolytic disinfection, advanced electrolysis, electrolytic sludge reduction devices.

    HASCO R&D and Patents

    • Appliance for electrolysis attached ship and the method of sterilizing red tide using it (2014)
    • Fabrication Method of Disinfection Water Using Electrolysis and the Apparatus Thereof (2008)
    • The organic sludge reduction facilities by means of electrolysis (2008)
    • Electrolysis Treatment Facilities and Method of CPP Regeneration Wastewater (2007)
    • Method of waste water treatment combined electrolysis and chemical with biological process (2006)
    • Development of advanced wastewater treatment method (HS method) including electrolysis process (2006)

    Photos of applied component

  • Vacuum Sewage Collection and Treatment System (VACUFLOW)


    The Vacuflow system moves the sewage from distributed sewage sources to the vacuum pump site and then to the final outlet using air flow through closed pipes under continuous vacuum. This is an excellent water collection system that can be economically and efficiently constructed by applying to areas where gravity flow work is difficult because sewage sources are distributed such as soft ground, rock ground, areas with high groundwater level, areas with a large amount of underground deposits, coastal areas, water source protection areas, and areas where environmental pollution problems are.

    Vacuflow Vacuum Sewage Collection System

    Vacuflow collects sewages to one central point from multiple sewage generation points by injecting air pressure to a closed pipe that maintains a certain negative pressure. Vacuflow collects sewage by dividing it into small amounts using the sewage inside the pipe and atmosphere, instead of the conventional method that collects sewage by applying a back pressure to the pipe filled with water. The main components of this system include the water collection part for inflowing sewage, vacuum pipe part, and vacuum station part.

    1. Inflow water collection part
    2. Gravity flow part
    3. Vacuum pipe part
    4. Vacuum tank part
    5. Vacuum station part
    6. Deodorizer
    7. Sewage treatment plant discharge part

    Features of Vacuflow

    Reliability aspects

    • Simple operation
    • Prevention of water quality accidents
    • Optimum facility for sewage classification
    • Ultra-low maintenance cost by trouble-free vacuum facilities and application of strict pipe design technology

    Constructability aspects

    • Shortened construction period owing to simple construction
    • Prevention of water quality accidents
    • Optimum facility for sewage classification
    • Fully-buried solid water collection device
    • Excellent pipe design technology and profiling

    Functionality aspects

    • Unmanned automatic operation with a latest monitoring system and life-time operation guaranteed by QUAVAC
    • Maintenance and training
    • Technology for preventing sewage leakage and the inflow of contaminated water

    Economic aspects

    • Construction cost saved by shortened construction period
    • Narrow and low bed excavation work
    • Construction cost saved by simple piping
    • Excellent construction for obstacles, ground water, rock area, and soft ground area

    Applications of Vacuflow

    • Sewage treatment area
    • Apartment & resort area
    • Industrial area
    • Larger super market
    • Power plant
    • Refinery & petrochemical area
    • Electronics plant area
    • Steel manufacturing plant area
    • Sewage pipe improvement and sewage combination/separation area (Renovation Area)

    Advantages of Vacuflow

    • Low investment cost
    • Quick excavation & installation
    • Minimal maintenance cost
    • Narrow and low pipe laying and small diameter pipe work (90~200 mm)
    • Flexibility of piping
    • Environmentally protected accidental terrain and protected fresh water, reservoirs and rivers

    Comparison of Gravity vs Vacuflow

    Gravity System

    Many lift stations are required and excessive excavation and management costs are needed due to deep excavation.

    Vacuflow System

    The excavation and facility costs can be greatly saved by narrow trenching.

    Excessive construction costs are needed for earth retaining and water drain due to deep excavation work.

    The construction cost can be minimized because there is no construction by earth flow and water drain with low excavating work.

    Deep excavation damages obstacles and interferes with pedestrians due to long construction period.

    The construction period can be shortened owing to small pipe size, without being interfered by narrow and low bed excavation and obstacles.

    Ground water may be contaminated due to leakage in the pipe and penetration into the pipe from the outside causes problems treatment troubles.

    The penetration of groundwater and external flow of the pipes are impossible because of field test with a monitoring system for the pipes of the entire length and operation in vacuum condition.

    Much affected by unexpected obstacles (rocks, existing water supply and drainage pipes, etc.)

    It is economical because the pipes can be constructed without much interference by obstacles due to the flexibility of the pipe work.

    Excessive material and construction costs due to pipe size (200mm~400mm)

    The material and construction costs are low due to the small pipe size (80mm~150mm).

    Photos of applied component