Page 528 - Industrial Wastewater Treatment, Recycling and Reuse

498 Industrial Wastewater Treatment, Recycling, and Reuse

Makeup
steam
Vapors

Vapors
Condensate
MVR

Feed effluent
Concentrated
effluent

Figure 13.6 Mechanical vapor recompression system.

• MVR can work with any kind of evaporator, including falling film evap-
orators, forced circulation evaporators, and plastic evaporators.
• MVR requires a marginally higher capital investment than is required by
the other evaporation processes.

Advantages
• MVR has low energy consumption.
• MVR has a higher performance coefficient.
• MVR places a reduced load on the cooling tower.
• MVR simplifies the evaporation process and thus plant operation.
Comparison of three evaporation systems is presented in Table 13.1.

Table 13.1 Comparison of typical evaporation systems
Multi effect Multi effect Multi effect
evaporation evaporation with evaporation with
Parameter (MEE) TVR MVR

Capital Medium Medium Relatively high
investment
Operating cost High Medium Low
Electrical energy Low Low High
Thermal energy High Low Low