Wastewater and treatment plants

Terms Definitions
Unit opertations
Physical - adsorption, membrane seperation process, ion exchance, flocultion,precipitation, MECHANICAL - flotation, sedimentation, filtration
Unit process
chemical - - almost always used with physical process - PH control, coagulation, chemcial preciptioation and oxidation - BIOLOGICAL - remove organics - AS and fixed dilm
Rapid Sand Filtration Process
Water Treatment Plant - 1.) coarse and fins creeens, 2 coag and floc. 3. sediment. 4. filt. 5 dis
RsF advantage
higher flow rate. Small land req. less sensitve to chang in quality of water a
Disadvantages of RSF
increased maintance in effective against tasts and dors. Lots of sludge
Lime Soda Softney process
WTP - 1. Screens. 2. Chemical Precipiation and floc. 3. Sed. 4. Recarnonation. 5. Filtration. 6 disinfect
Used to reduce PH to stabalize CO2. Lima and soad ash cause hardness particles to perciptate out
Ground Water Treatment Plants
Gas stripping, chlorination, Softening may be required
Slow sand filtration plants process
1. screens, 2. sediment. 3. slow sand filtration 4. disent
Advantages of ssfp
lower energy, lower maintance and easy to build
Primary Treatment for WW
uses tanks, clarifiier to setlle sludge and allows greas and oil to raise to the top. removes most of the suspended solids
Secondary Treatment for WW
io- oxidizing orgains ss, b-o orgainc DS. Designed to degrade the biological content (AS and FF)
Activated slude plant Process
screens, grit removal, primary clarifier, AS, chlorination
Terteraty treatment
physical-chemical method that treats effluent from secondary - lime coagulation and fluc, sed, ammonia stripping, recarbonatin, multimeda filt, carbon absorption, breakpoint chlorination
Industrial waste W
organic or inorganic - use complettly mixed AS plant or areated lagoon for high organic counts
Completely mixed AS
aeration tank 2. clarifier 3. thickner clarifier 4. aerobic digester
aerated lagoon
lagoon with aerators 2 stabilization pond.
To design a WTP
1. Pop forcast 2. water demand 3. increase current demand by o.1 times percent increase in pop. 4 design capacity - aveage flow on day of max demand 5 ph turbidity, color odor, tast harness, alkainity, DDS and coliform count
To design a WWTP
1. Pop forcast 2. flow = water demand (Seperate sewer systems). 3 futur demand 4. design capity - max daily flow during wet weather 5. BOD5, SS COD, organic nitrogen, grease, ph
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