Solutions for Industrial Water Treatment
Water scarcity and water pollution are the serious issues being faced by many countries across the world. Recycle & reuse of wastewater is the most prudent solution to this problem. Therefore, some environmental authorities all over the world have instructed industries to introduce Zero Liquid Discharge (ZLD) system.
Toshiba group has a state of the art ZLD system based on HERO™ (*1) technology which provides superior degree of treatment with high efficiency and reduces life cycle cost to conventional systems.
(*1) : HERO™ is a trademark and is a proven technology with 150+ reference installations worldwide.
ZLD system may be introduced in cases where water resources are limited, or where environmental sustainability is the priority.
Recycling system by RO (Reverse Osmosis) membrane generates reject water, which is highly concentrated effluent with TDS (Total Dissolved Solid). In most cases such reject water may not be allowed to be discharged. Therefore, industries install evaporators after RO, which evaporate reject water & concentrate salts to dryness. Also, since evaporators being an expensive system, it is a prerequisite to incorporate a high efficiency RO in the ZLD process so as to minimize RO-reject volume and have most optimized size of evaporator installed. This can be achieved by increasing the recovery across RO System in ZLD system based on HERO™ technology.
The ZLD system with conventional RO has scaling & fouling issues which results in increase of feed pressure, decrease in permeate flow, lower permeate quality, frequent RO cleaning, longer downtime and eventually frequent replacement of RO membranes.
Conventionally, to prevent scaling, the RO-feed pH is lowered and antiscalant is dosed. This approach works for preventing hard scaling, but if the recovery rate goes higher, this will not work anymore. Further, lower pH decreases silica solubility and causes silica scaling. For many industrial effluent, some COD (Chemical Oxygen Demand) still remains after biological treatment. In many cases, conventional RO fails to sustainably operate at 80%+ recovery, due to silica and residual COD in the feed water.
HERO™ is the technology which prevents all the scaling/fouling factors (hardness, alkalinity, silica precipitation, organic fouling and bio-fouling) by resins, de-gasser and high pH operation and in turn maximizes recovery across RO System.
In HERO™ system, all the scaling/fouling are eliminated; therefore, the system can maximize the RO water recovery rate up to significantly higher levels.
|Lime/Caustic Clarifier and/or Ion Exchange System||Degasser Tower or Degassing Membrane||High pH RO Operation|
|Hardness Removal (Softening)||Alkalinity Removal||More than pH 8.5
(Preferably 10 to 11)
|To remove Ca, Mg and other heavy metals, which potentially cause scaling in RO||To remove carbonic acid which is a cause of carbonate salt scaling in RO||To improve silica solubility, to prevent adsorption of organics on RO, to inactivate bacteria, to enhance the zeta potential between membrane and particles|
1. Hardness Scaling
1. Hardness Scaling
2. Silica Scaling
3. Organic Fouling
HERO™ system lowers the operational cost due to high efficiency, low reject generation and smaller size of evaporator system installed as compared to conventional RO system.
|ZLD with Conventional ROZLD with Conven
|ZLD with HERO™|
|Recovery Rate||LOWNormally water recovery rate will be 70 to 80%.||HIGHMore than 90% recovery rate will be achieved. It depends on water condition.|
-RATEThe larger evaporator size leads to a higher initial cost.
-RATEIncreased cost by the additional pretreatment system (ion exchange, degasser) and the high pressure RO system, but decreased cost by smaller evaporator and smaller boiler.
|Running Cost||HIGHHigh steam consumption leads to a very high running cost.||MUCH LOWERRunning cost will be significantly lower than a normal RO system. The initial investment will be recovered in a short period of time.|
-RATECompared to conventional RO, more equipment needs to be checked in daily inspection, but there is no special equipment which requires greater care.
-RATEScaling/fouling trouble requires frequent RO CIP(Clean In Place). Hardness rich RO reject causes frequent cleaning of the evaporator.
|GOOD Scaling/fouling is prevented in HERO™, resulting in less frequent RO CIP and longer membrane life. Low hardness reject assures stable operation of the evaporator.|
HERO™ is enabled in the area where Toshiba group is available for sale except the following field.
Recovery rate of conventional RO system is limited to 70% - 80% depending on the inlet water quality.
We offer HERO™ system for ZLD application which can operate at more than 95% recovery rate in most cases.
RO system based on HERO™ can reduce reject water to one-fourth (1/4) in volume compared to conventional RO system and thus provide huge operational savings to the end user.
Preventing the scaling/fouling factors increases life of RO membrane and decreases system shut down time. It also leads to huge reduction in life cycle cost of the system.
*The name of products, services and companies mentioned herein may be trademarks or registered trademarks of respective companies.
*The information contained herein is presented only as a guide for the applications of our products. No responsibility is assumed by Toshiba for any infringements of patents or other rights of third parties which may result from the use of our products. No license is granted or otherwise implied under any patent or patent rights of Toshiba or others.
*Toshiba products should not be embedded in other products for which the production or sale is prohibited by law.
*Toshiba does not assume any responsibility for incidental damage (including business interruption, loss of business information, and other pecuniary damage) arising out of the use or disability to use Toshiba products.
*All information herein is subject to change without notice, including product specifications.
*The products described in this document include products subject to foreign exchange and foreign trade laws.
*The products described in this document contain components made in the United States and subject to export control of the U.S. authorities. Diversion contrary to U.S. law is prohibited.
Project Description: An automotive company has set up their first car plant in India. A single waste water treatment plant was envisaged to cater to their complete industrial water requirements. Accordingly, ZLD (Zero Liquid Discharge) has been achieved.
Our Scope: Design, engineering, supply, erection, installation, testing and commissioning
Solution: We constructed ETP (Effluent Treatment Plant) - ZLD system consisting of pre-treatment, anoxic - aerobic - MBR (Membrane Bioreactor) based treatment, HERO™ thermal based evaporation system to produce treated water fit for reuse in the production plant. With HERO™ the size of the evaporator is less than one fourth of a conventional RO system, saving steam consumption by 75%.
Please download Zero Liquid Discharge(ZLD) with HERO™ System Leaflet of Toshiba.
Please download Zero Liquid Discharge(ZLD) with HERO™ System(PDF:547KB)
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