or press operations, or evaporative, which are solar
10-2. Pretreatment wastes. Systems that require
beds or lagoon operations.
The alternatives for
pretreatment processes produce pretreatment wastes.
pretreatment sludge disposal are shown in figure 10-2.
Solid materials, and the chemicals added to precipitate
In addition to solid wastes, pretreatment processes can
them, form floc that will be removed from raw water by
produce liquid wastes from filter backwash operations.
The sludges formed must undergo
These liquid wastes often can be reclaimed or treated
dewatering and are sent to a landfill. Dewatering
along with other liquid wastes from desalination process.
processes can be mechanical, which are centrifugation
Figure 10-2. Pretreatment sludge disposal.