Rain storing tank

Raw liquid waste treatment process

Reaction of .alpha.-phosphorus containing carboxylic acids with

Reclaiming process for zeolite served for adsorbing ammoniacal n

Reclamation of cement slurry

Record storage apparatus

Recoverable regenerants for cationic exchange resins

Recovering oil from emulsion by stirring, heating, and settling

Recovery and reuse of paint solids from waste water

Recovery of activated carbon

Recovery of chromates by membrane

Recovery of color developer

Recovery of mercury

Recovery of silver from silver-containing solutions

Recovery of uranium by a reverse osmosis process

Recycle treatment of waste water from nickel plating

Redox resin process

Refrigeration device comprising a water filter

Regeneration of fixed bed filters

Regeneration of ion exchange resins