The industrial water treatment helps to optimize the industrial processes which are dependent on water consumption. The ZLD is the process of water treatment which have no water byproduct. Instead of it, solids are been produced which are processed either as the hazardous waste or non-hazardous waste. These can be accomplished by using techniques such as evaporation and solidification, here; the liquids are been evaporated or crystallized. Such techniques for treatment are been gaining popularity with the industrial facilities that face more stringent ELGs on waste water which get discharged from their facility. It is a popular trend, especially for the power generation plants.
When coals are been burned in order to make energy, gas are been produced which has presence of sulfur dioxide. The gas is been released in to the atmosphere through flue. Prior to release of gas, it is been cleaned by making use of scrubber system which include water solution. This process of cleaning is known as Flue Gas Desulfurization and the water from waste from the scrubber of FGD produces FGD waste water. There are ELGs in EPA that is specifically for the FGD waste water. Selenium of small amounts is required by the wildlife for good health. Higher concentrations of it will most probably be detrimental to the wildlife and it can also be fatal. The selenium levels are found typically in surrounding water and downstream of the power plants are quite high that is dangerous to the wildlife such as birds and fish that eat from the water source. For instance, in birds, too much of selenium can make the eggshell of the birds or fish weaker that result in poor rate of birth. All the plants of power generation should meet ELG for selenium which is mandated by EPA. Moving to the process of Zero Liquid Discharge industrial water treatment allows such types of facilities to meet the ELGs, if discharge is avoided.
The ELGs change and the manufacturers are required to face or act consequences if guidelines are not met. More often, over the period of time, the ELGs become stricter and the facility of manufacturing ends up requiring purchasing the additional industrial equipment for the water treatment and also the chemicals or to replace their system altogether. Replacing or adding the equipment for water treatment means that personnel are added in order to operate on it and cash in order to purchase it. The additional costs of water treatment increases the operating costs overall.
The ZLD system helps in eliminating the need to react to the ELGs changing because there is no any waste water that should meet up the limits. These kinds of systems are sometimes been used as the stand-alone treatment following the treatment of waste water or these are been used along with the industrial water reuse system. By combining these means that not only you will never ever have any waste water for discharge but you have the added benefits of saving the cost on purchasing the water. The waste from these systems are disposed in the landfill as non-hazardous waste if right process of pretreatment is been used.