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WATER TREATMENT GRADE 4 (ACTUAL / ) EXAM
PREP QUESTIONS AND VERIFIED ANSWERS
to prevent scale buildup magnesium hardness should be reduced to, what level through exess-lime treatment 40 mg/L
Turbidity MCL .3 ntu monthly or 1 ntu
chlorine mcl 1.0
Haloacetic acids (HAA5) mcl .06
TTHM or THM mcl .08
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chloramines cl2 mcl 4.0
chlorine dioxide CLO2 mcl .8
chlorine as cl2 4.0
Fluoride MCL and MCLG 4.0 and 2.0
nitrate mcl 10
nitrite mcl 1
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what detail is not recorded for each filter run expected length of filter life
how often should an operator record bed expansion measurements, conditions and depth of media, and an evaluation of the bed surface quarterly
which authority suggests that the turbidity performance and particle count in each sedimentation basin be recorded periodically (daily every four hours hourly)?the partnership of safe water
which standard covers materials that are in contact with water such as coatings construction materials and components used in processing and distrubting potable water NSF/ANSI standard 61
how often does AWWA check that its standards are being met by each water system in the US they dont monitor systems adherence to standards
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total dissolved minerals in rainwater are typically low resulting in very soft water
confined aquifer a permeable layer between two impermeable layers
the least important issue when considering the selection of the most suitable water treatment proccess is legislative input
A treatment plant that incorporates coagulation sedimentation filtration and disinfection is an example of the multi barrier approach to treatment
Slow surface runoff can infiltrate into ground and recharge aquifers
one common method of removing high levels of fluoride uses activated alumina
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