In many cases, for instance with wash waters, fluoride-free iron phosphate solutions and most glycol-polluted wastewaters, no pretreatment of the incoming wastewater is required at all. In other cases e.g. sludge-polluted wastewaters, emulsions, acidic wastewaters, chromium VI or cyanide-polluted wastewaters or other problem wastewaters, pretreatment is required and our technical sales office will work out in conjunction with our project engineering department the right solution for your spcific situation.
LOFT Wastewater Pretreatment
In accordance with our sales philosophy we are committed to providing not only the best evaporator but also a perfect overall system. Our goal here is to ensure full customer satisfaction. Along with the evaporator itself, tanks, piping and the distillate posttreatment unit, the overall system includes as well pretreatment of the infeed wastewater.
Examples of wastewater pretreatment include:
- neutralization,
- prefiltration through cartridge, bag or belt filters,
- oil and sludge removal by means of a LOFT separation tank (LST),
- detoxification,
- chromium reduction and
- temperature correction of the infeed wastewater.
LOFT SEPARATION TANK (LST)
Oil emulsions and sludge-polluted wastewaters can be precleaned prior to evaporation in a LOFT SEPARATION TANK (LST).
The LST unit contains an accumulator tank for neutralization and precleaning of the inlet wastewater incorporating automatic or manual oil/sludge removal and an integrated pH neutralization module.
Process Description:
The wastewater to be concentrated is pumped by a suitable pump from the accumulator tank into the LST unit. Following neutralization the wastewater flows into a settling chamber for phase separation.
Sludge settling down to the bottom of the tank is drawn off by a sludge pump. Oil floating on the surface is removed via an adjustable skimmer arm. The precleaned and neutralized wastewater is drawn into the evaporator from the third chamber. The sludge phase on the floor of each chamber can be pumped to the concentrate tank by manual switching to select the chamber to be emptied. The oil separated off can also be pumped from the oil drum to the concentrate tank, this process activated as well by manual switching.
