Grade 3 Water Treatment

Cartridge filters are commonly used for what immediately prior to

Reverse Osmosis

Hours needed for membran filter for coliforms

22-24 48 if not result

Fusible plug chlorine melt temp is

158F o165F

Clarifier designed for what solids contact basin should be drained and inspected every.

1-5 years

Most effective method for removing VOC

Activated Carbon

Which may cauase oxygen deficiency in source water?

Decomposition, nutrient pollution, high temp poor circulation

Water exits the bottom of the filter exceeds the rate at which the water penetrating the top of the filter

When Flow out paces the filters permeability

Collodial organic compounds in water can cause which of the following

Turbidity , foul tatse and odor, mobilization of toxic metals

Primarily contributors to sedimentation basin residual accumulation

Watershed erosion

Nosiy drive cahin in a clarifier an operator should

Immediately inspect for improper tension, sptrocket, misalignment, lack of lubrication, or warn. hooded sprorocket teeth.

Remove fluoride from a water supply method

Reeverse osmosis, Distilliation, or activated alumina filtration

Odor emitted from hydrogen sulfide gas

Rooten eggs

Importatnt to evaluate coagulation and flocculation data over can be used over a one-year period because

Captures seasonal variation in raw water quality

Granualar media filter which of the following is the test water quality indicator for dertmining filter efficeincy

Turbidity NTU, Particle count, Headloss

Chlorine dioxide can be generatred by adding which of the following to chlorine solution

Sodium chlorite

A membrane process that removes dissolved organic matter from the water that could generate by-products is

nanofiltration (NF)

Medicinal smell of the water (caused by what)

overdosing the alum or improper ph and alkalinity levels during the treatment process

Fixa liquid chlorine leak by

Evacuate and ventilate

Analyses can be used to determine if increased coagulant dosages will reduce objectable taste and odors

Yes conducted analysis like a standared jar test, combined with sensory and chemical evalution

Chemicals used to increase PH. and alkalinity of water

Sodium bicarbonate, sodium carbonate and sodium hydroxide.

Main advantage having a source water reservoir is

Realiable, long-term water supply drought resilience

The approximate ph. of Fluorosilicate acid is

Less than 1 typically around 1.2

hwy is the following an precursors for THMS

Form of organic matter

Qualities is critical when determining if water is safe to drink

Microbiology sefety chemical composition and physical properties

Dissolved aluminum in filtered water

The portion of the metal that passes through a fine filter (0.45) and remains in solution

Max hold for preserved manganses sample

2-6 months

Raw water is charged or not positive or negative

Overall Neutrality

An effect of bacteria in a well

Severe health risk from pathogenic bacteria

water is considered to be stable when it has become saturated with

Calcium carbonate

Following is ued to keep iron in solution

Chelating agents

Copper culfide to control both plankton and permilmotoe in domestic water supply reservioirs is primarily used by control of

Taste&odor , toxin removal, filter clogging prevention

Chlorine dioxide si generated on a site using sodium

Sodium chlorite

Wear ring are installed in a pump to

Prevent internal fluid recirculation protect exspensive parts from wear

React with carbon and starts fires

Oxygen

short filter runs or turbidity breakthrough in a rapid sand filter can be minimized by

Optomize pretreatment coagulation, flocculation

Generally an effect of pre-ozone nation

Breaking down large organic molecules to improve coagulation

Which of the following increases the settlign efficiency of conventional rectangular sedimentation basin

Adding tube settlers or lamella plates

Organic polyelectrolyte negative or positive

Both positive and negative

Vertical flocculators vs horizontal flocculators

Verticals flocculation use top-mounted motors and vertical shaft while horizontal systems

Powered activated carbon ventilation why important

Contorlling hazardous industrial emissions, capturing toxic chemicals fumes, and maintaining safe compliant air quality

What should be done to a filter bed once a year

Inspected sanitize the system eliminate bacteria

Mantenance management system

Software that centralizes asset data, automates work orders inventory and scheduales preventive maintenance.

Zeta potential -9mV to zeta potential -3mV

-3mV nearly neutralized closer to zero less stable further from zero more stable

Effects of stratification of water can be minimized by the used of which type of structure

Sub-surface aerators mechnaical circulators

Over feeding polymer cuase what

Poor coagulation

Layer that separates upper lower thermally stratfied lake.

Thermocline or Metalimion