Zero Liquid Discharge Plants (ZLD)
Zero Liquid Discharge (ZLD) is a method of purifying water that eliminates all impurities. Reducing wastewater economically and producing clean, reuse-ready water are the main goals of ZLD.
Achieving zero liquid discharge can be accomplished by a number of different techniques, including evaporation, ED/EDR, FO & MD, etc. The industrial wastewater is pretreated and evaporated using the ZLD technique till the dissolved solids separate out. As previously stated, high water recovery is achieved by electrodialysis (ED / EDR), forward osmosis (FO), and membrane distillation (MD) techniques in addition to evaporation.
Evaporators are of four types
- MVR - Mechanical Vapour Recompression
- Multiple Effect Evaporators
- Atmospheric Evaporators
- HDH Evaporators - Humidification - Dehumidification Evaporators
The ZLD system typically consists of two phases, each of which is illustrated. Pre-treatment is crucial when it comes to ZLD. Pre-treatment procedures include neutralization, pH adjustment, coagulation, flocculation, and ultrafiltration.
Description
The sophisticated wastewater treatment technique known as zero liquid discharge uses evaporation/crystallization, reverse osmosis, and ultrafiltration. ZLD technology enables firms to assist facilities comply with discharge and water reuse regulations. An industrial plant that doesn’t release wastewater is known as a ZLD facility. Wastewater recovery, evaporating reject water in multiple effect evaporators (MEE), crystallizers, and ATFD are typically used to reach the target ZLD.
There are four kinds of evaporators.
- MVR - Mechanical Vapour Recompression
- Atmospheric Evaporators
- Multiple Effect Evaporators
- HDH Evaporators - Humidification - Dehumidification Evaporators
FEATURES
- High efficiency, sturdy design
- Easy to install
- Less maintenance
- Highest steam economy
- Compact design
APPLICATIONS
- Pulp & Paper industries
- Oil & gas industries
- Sugar Industries
- Textile & Pharmaceutical industries
- Distilleries, Chemical industries,