Wastewater Treatment & Reclaiming

The degree of contamination varies greatly between domestic and industrial wastewaters. Wastewater is discharged after being purified by chemical, biological, and physical processing methods or reused after being purified to be complied with the specific purpose of use.
The wastewater treatment process is basically designed as a cyclical process of contaminant removal and water purification.
Based on experience an dknow-how for 20 years in the wastewater treatment of various industries, Hansung Cleantech is developing economical and efficient systems that are the most ideal for industrial wastewater.


  • Wastewater Treatment in the Electric and Electronic Industries

    Introduction

    With the development of the electric and electronic industries, the wastewater treatment process is changing in line with the properties of industrial wastewater. Electric and electronic wastewaters are largely divided into inorganic and organic wastewaters. Thus, it is advantageous for the optimum design of wastewater treatment to separately discharge inorganic and organic wastewaters from business sites. The general treatment process is as follows.

    Thus, it is advantageous for the optimum design of wastewater treatment to separately discharge inorganic and organic wastewaters from the facility. The general treatment process is as follows.

    Inorganic Wastewater Treatment Diagram

    The inorganic wastewater discharged from the business site is collected first in a wastewater tank and the pH is adjusted in the pH adjustment tank in line with the properties of the wastewater to maintain the optimum conditions for the reaction and flocculation of the following process.
    When the flocculation reaction is completed by injecting chemical in line with the process of the reaction and flocculation tanks, the slurry is separated from the precipitation tank or the dissolved air floatation tank, and the treated water is moved to the treated water tank. The water is then released from the final filtering device.

    Organic Wastewater Treatment Diagram

    The introduction of the MBR process in place of the flocculation and precipitation equipment in the traditional organic wastewater treatment process decreased the installation area compared to the existing process. Furthermore, the amount of sludge discharged is decreased for stable operation without influencing the properties of the original wastewater, and the fact that various types of membranes may be applied leads a design to be more convenient. Especially, in case of re-using wastewater, outstanding effect is expected.
    Hansung Cleantech has a patent on MBR process. Under accumulated expertise, Hansung Cleantech may analyze the wastewater at the site to design the optimal MBR process for customer satisfaction.

    MBR (Membrane Bioreactor) Process

    기존의 전통적인 유기폐수 처리공정 중 응집 및 침전설비를 대신하여 MBR process를 도입하므로써, 기존의 공정에 비하여 설치면적이 감소되었고,
    배출 슬러지가 감소하며 원폐수의 성상 변화에 큰 영향을 받지않고 안정적으로 운전되어 운전관리가 원활하며, 다양한 종류의 Membrane을 적용할 수 있어 설계가 용이합니다.
    특히 폐수를 재이용하고자 하는 경우 탁월한 효과를 기대할 수 있습니다.
    한성크린텍은 MBR process의 특허를 보유하고 있으며, 축적된 풍부한 경험을 바탕으로 사업장의 폐수를 분석하여 최적의 MBR process를 설계하여 고객을 만족시킬 수 있습니다.

    MBR (Membrane Bioreactor)

    Recently, the MBR process, which is a combination of a method of removing organic matters and nutrient salts by microorganisms and the membrane separation method, is widely used for domestic and industrial wastewaters.
    The MBR system is installed inside a biological reactor or as an external circulation type.
    Since various types of membranes may be used for application in wide fields, since installation does not take much space, and since a process is shortened, it is advantageous. The special features of MBR include the treatment of highly contaminated wastewater, the treatment of a large volume of water, reuse of wastewater, and sludge reduction. Furthermore, it does not need filtering and disinfection facilities due to its excellent filtering performance unlike the facilities using the active sludge treatment method. In addition, easy maintenance and small installation space are advantages from the minimization of facility size.

    Advantages

    • Wastewater treatment capacity of a high standard
    • Biological concentration
    • Small installation space and space utilization
    • Sludge reduction and economic efficiency

    Objectives

    • Reduced use of biodegradable chemicals
    • Reduction of bacteria, turbidity, and organic matters
    • Reduced use of surface-active chemicals

    Applications

    • Treatment of domestic and industrial wastewaters
    • Treatment of highly contaminated water
    • Recycling of wastewater

    MBR Membrane Contamination Prevention Techniques

    Periodic Backwash

    - Treated water is injected in reverse direction of filtering to clean the air and to prevent the deposition of floating matters on the separation membrane surface.

    - Automatic valve operation for filtering and backwash by a single pump (filtering for 14 min and backwash for 30 sec)

    Cyclic water cleaning

    - Air is supplied alternatively in intervals of 10 seconds by dividing the diffuser into two parts.

    - Prevention of over-aeration inside the bioreactor and reduction of power cost

    Periodic oil cleaning

    - Add chemical (NaOCl) to the backwash water

    - Repeat backwash for 30 sec and hold for 10min.

    - Perform 2-3 times per week to suppress the proliferation of microorganisms on the separation membrane surface without affecting the bioreactor.

    Membrane fouling control by automated operation

    Photos of applied component

  • Wastewater Treatment in the Petrochemical Industry

    Introduction

    In twenty first century, along with the diversification of industries and the development of civilization, the petrochemical industry has been growing since decades before. The industrial wastewater treating technology is developing continuously as well.

    The general process of the wastewater treatment system in petrochemical plants is as follows.

    Petrochemical Wastewater Treatment Process Diagram

    Characteristics of petrochemical wastewater treatment

    The wastewater generated from petrochemical plants can be largely divided into wastewater containing oil and general process wastewater.
    The wastewater containing oil is separated from wastewater and collected and transferred to the API unit where it is separated by the weight difference between water and oil. Thereafter, the free oil that floats above water is removed by skimming.
    At least 90% of oil remnant after API is removed by CPI. This wastewater containing oil less than 10% is flown into the equalizing tank where it is mixed with general industrial wastewater. The wastewater flown into the equalization tank flows into DAF or IAF through the pH adjustment, reaction and flocculation tanks where the emulsion oil and slurry in the wastewater are floated to the top and removed.
    The wastewater after the first treatment is flown into the aeration tank to remove high molecular COD elements from the wastewater, where the high molecular COD elements are decomposed by microorganisms and change to low molecular matters. To remove bio-sludge that is generated here, it is flown into the precipitation tank where the sludge is deposited and transferred to the dehydration system. The overlying water is discharged, or if it requires advanced treatment, it passes through a sand filter or A/C filter before being discharged.

    Photos of applied component

  • Wastewater Treatment in the Power Generation Industry

    Introduction

    The development of industries and the improvement of the standard of living incidentally lead to increased use of electricity. Therefore, more power plants are required to produce more electricity. As a result, power generation wastewater is discharged and technology to effectively treat this wastewater is required.
    The general power generation wastewater treatment process is as follows.

    Power Generation Wastewater Treatment Process Diagram

    Characteristics of power generation wastewater treatment

    Power generation wastewater is classified into wastewater containing oil, daily wastewater generated from normal operation, and abnormal wastewater generated during the maintenance of power plant.
    First, free oil is separated and removed from the wastewater containing oil by the weight difference between water and oil in API or CPI.
    Free oil generally refers to the oil that floats above water and is distinguishable by naked eye. Emulsion oil refers to oil that is not distinguishable by naked eye because it is dissolved in water.
    Therefore, the emulsion oil that is not removed by API or CPI is removed by IAF or dissolved air floatation tank in the following stage and is flown into the daily wastewater tank. The oil-removed wastewater flown into the daily wastewater tank is mixed with daily wastewater. The abnormal wastewater generated during the maintenance of the power plant is collected in the abnormal water tank and disposed by being mixed with the daily wastewater tank little by little.
    General power generation wastewater has no large contaminants except for oil and sludge. Thus, in the following process, sludge is removed from the wastewater while it passes through the pH adjustment, reaction, flocculation, and precipitation tanks before being discharged. Or to recover and use the wastewater as reusable water, advanced treatment devices such as sand filter or A/C filter can be installed and used.

    Photos of applied component

  • Wastewater Reuse

    Introduction

    As it is becoming more difficult to acquire well-quality water resources, interest in the zero-discharge system through direct reuse as process water is rising in industries requiring much water such as steelworks, power plants, paper manufacturing, and electronics.
    The water reuse system provides such advantages as the reduction of cost and investment for water production which are continuously increasing, for the acquisition of stable water supply to prepare for the future expansion of production facilities, and for the minimization of additional facilities.
    The wastewater generated from industrial sites is retreated through the separation membrane and passes through an additional process if required to be reused for a specific purpose. Based on experience in various wastewater reuse facilities, Hansung Cleantech diagnoses the properties of wastewater to determine whether it can be reused, and then the optimum reuse facilities are designed in line with the properties of wastewater.
    Patented Reuse Facility of Hansung Cleantech

    HASCO’s Reclaiming System process diagram

    System Advantages

    • Strict acquisition of the legal water quality of discharged water
    • Easy maintenance (convenience of operation and automation)
    • Achievement of stable treated water quality even under change in water quality
    • Satisfaction of the effluent water quality standards which are expected in the future (nutrient salts)
    • Optimum pretreatment for recycling water process

    Applications

    • UPW discharge and recovery system
    • Zero discharge system for industrial facilities
    • Reuse of the effluent of industrial wastewater treatment systems
    • Reusable water utilization system in the plant

    Photos of applied component