Reduce the Discharge of Industrial Wastewater – by using highly efficient, innovative range of Sintech pumps. Continue reading to find out how you can “Save Water, Time and Money” with a Zero Liquid Discharge System, powered by Sintech’s latest range of industrial wastewater pumps.
It’s Impossible to Reuse our Planet. But, we can indeed Reuse our Wastewater.
All major industries today consume substantial amounts of freshwater while generating massive tons of industrial wastewater. The wastewater generated from these plants is usually discharged into nearby water bodies like a pond, or deep well injected.
This not only poses a significant threat to our ecosystem but also causes major effects on public health. It also causes it causes severe groundwater contamination and other environmental problems. Additionally, discharging wastewater into the environment damages the reputation of businesses.
Reduce and Reuse Industrial Wastewater – The Need of the Hour
Zero Liquid Discharge (ZLD) systems present an innovative and sustainable solution and help to address the challenges industrial plants face in discharging wastewater sustainably. Also known as Minimal Liquid Discharge (MLD) treatment system, it helps to reuse and reduce industrial wastewater discharge. It’s an ambitious and innovative wastewater management strategy that helps to eliminate liquid waste while helping industries recover most of their wastewater discharge for reuse.
ZLD is extremely beneficial to both the industry as well as the environment. However, the process is generally constrained by implementation limitations, extensive energy consumptions, and high costs.
Industries that Benefit from Reducing Wastewater
- Paper manufacturing
- Sugar processing
- Power Plants
- And, several others
Sintech presents Cost-Effective and Efficient Wastewater Treatment Pumps
Salient Highlights of Sintech Pumps for ZLD Systems
- Effortless scalability – Since the pump can run in parallel with other pumps and systems
- Low leakage risk – Due to low housing pressure
- Strong corrosion resistance – Since our range of pumps are made with high-grade steel
- Low Pulsation – With a large number of pistons, our pumps have a positive impact on pulsation levels in the system
- World-class Efficiency and Easy installation & maintenance – Backed by the Sintech mark of reliability
Here’s a quick introduction to the working of a ZLD system.
What is a Zero Liquid Discharge System?
As the name implies, the ZLD reduces the wastewater generated by an industrial plant. It can be broadly defined as a process that allows maximum recovery of water from a wastewater source. Without ZLD, the wastewater will be discharged into the environment or below ground. ZLD reduces the amount of wastewater discharged by reusing it beneficially.
Zero Liquid Discharge can happen in many ways. There isn’t one solution that fits all. A ZLD system is highly site-specific. What works for one industrial plant may not be the best solution for another. Choosing the right ZLD system for your plant depends on several factors like wastewater composition, operating costs, the volume of the wastewater generated, the streams of wastewater to be treated, footprint availability and more.
The size and complexity of the ZLD system depend on the nature and volume of the wastewater to be treated and other factors. It can include membrane processes, stand-alone thermal/evaporative processes and/or hybrid systems.
How Does Zero Liquid Discharge Work?
The ZLD is a wastewater treatment process that purifies and recycles wastewater. This system aims to leave zero discharges at the end of the water treatment cycle. It’s an advanced wastewater treatment method that uses several innovative processes like reverse osmosis, ultrafiltration, fractional electrode-ionization, and evaporation/crystallization.
While the actual ZLD system varies from one application to another, a standard ZLD process generally consists of the following steps:
Step 1: Pre-treatment and Conditioning
Pre-treatment involves removing simple things from the wastewater stream by filtering or precipitation. It also conditions the water and reduces the number of suspended solids in it.
Generally, the pre-treatment unit makes uses of a clarifier/reactor to precipitate hard metals, silica and other dissolved components in wastewater.
Step 2: Coagulation
Sometimes, caustic soda is added in this step for coagulation. This is a technique in which various chemicals are added to the reaction tank to remove contaminants, and other bulk suspended solids from the water.
Step 3: Flocculation
Once coagulation is over, the treated water is passed into a flocculation chamber. Here, the coagulated particles are stirred with long-chain polymers creating visible particles that look like snowflakes.
Step 4: Sedimentation
The treated water then enters the sedimentation stage. This consists of a gravity settler that is a large circular tank. The flocculated material and the water flow into this tank, to undergo a slow settling process. The water rises to the top and overflows the perimeter of the clarifier allowing solids to settle at the bottom of the clarifier.
This forms a sludge blanket at the bottom. The solids are then passed into a tube, and the sludge is passed into a sludge handler.
Step 5: Sludge Handler
The sludge handler begins the dewatering process. Depending on the composition of the wastewater, additional chemicals may be added at this stage to reduce the quantity of silica and other materials in the water.
Step 6: Ultra-Filtration
Ultra-filters can be used in place of gravity sand filters. Fine membranes that filter contaminants from water replace the clarification stage completely.
Step 7: Concentration
The concentration of the wastewater can be done using any one of the following reverse osmosis membranes, electrodialysis, or brine concentrators. All three methods have varying requirements and the ideal method for concentration is dependent on the application type. Sometimes, two or more concentration methods can be used together to achieve the desired effect.
At the end of the concentration stage, you can reclaim up to 60 to 80% of the water.
Step 8: Evaporation/Crystallisation
The next step involves generating a solid from the water using thermal processes like evaporation. In evaporation, the water is completely evaporated, leaving behind solid wastes. The evaporated water is then recollected and made available for reuse.
Sometimes de-aeration is done at this stage to release dissolved carbon-di-oxide, oxygen, and other non-condensible gases. The leftover waste from the evaporator is then sent to a crystalliser. The solids are filtered out as crystals, and the water is made available for reuse.
The treated water is then stored in a holding tank and is reused as required. The ZLD system makes water safe for reuse. The solids generated from the process are converted into a solid cake, which either can be reused or goes to a landfill.
Join in the Fight against Water Scarcity with Sintech Pumps
Here, at Sintech, we believe that as industrial pump manufacturers our responsibilities go far beyond producing and developing the latest pump systems. We believe that we have a role in caring for our environment.
To support large-scale industries reduce their water consumption footprint – we are committed to developing sustainable solutions that will impact the world of tomorrow. We offer a wide range of high-pressure pumps for the wastewater industry.
As one of the largest and leading industrial pump manufacturers, our range of pumps is engineered to provide you with world-class efficiency and reliability. We help you achieve your business objectives while helping you make a positive impact on the world.
If you like to know more about our pump solutions, and how we can build customizable systems that work for your business, get in touch with our pump experts today. Check the range of water pumps which used in wastewater treatment.