Parallel desalting (PDS) includes a hybrid membrane softening (MS) system
for de-mineralizing water for residential and commercial use. Parallel
desalting produces "soft" water without the use of salt, or any other
liquid chemical reagent normally used to carry out pH adjustment in
industrial membrane and precipitation processes. The PDS process balances
the operation of a RO (potable water) membrane unit with the operation of
a tubular MF (wastewater) membrane unit, thereby providing a highly
efficient and regenerative water treatment technology: (1) The optimum
operation for the PDS system transforms roughly 90 percent of a potable,
slightly brackish water supply into <50 mg/L TDS water with <1
-grain (10-15 mg/L as calcium carbonates) water hardness; and (2) The
operation of the PDS system produces, in salinity terms, in a 100 percent
reusable effluent for downstream recycling. Virtual prototype results
suggest that with Colorado River Aqueduct source water (570-620 mg/L TDS
and 16-grain water hardness), parallel desalting can produce an effluent
with a TDS 40-70 mg/L lower than the originating supply (excluding TDS
contributed directly by the particular type of use of the soft water).
O desalting paralelo (PDS) inclui um sistema amaciando da membrana hybrid (MS) para desmineralizar a água para o uso residential e comercial. O desalting paralelo produz a água do "soft" sem o uso do sal, ou todo o outro reagent químico líquido usado normalmente realizar o ajuste do pH em processos industriais da membrana e da precipitação. Os contrapesos process do PDS a operação de uma unidade da membrana do RO (água potable) com a operação de uma unidade tubular da membrana do MF (wastewater), desse modo fornecendo uma tecnologia altamente eficiente e regenerativa do tratamento de água: (1) a operação a melhor para o sistema do PDS transforma aproximadamente 90 por cento de uma fonte de água potable, ligeiramente brackish em
