ABC Wastewater Level 3 – Lab Training & Certification

ABC Wastewater Level 3 - Lab

To have significant meaning for D. Proportional composite sampling
laboratory tests of the evaluation of a
wastewater treatment plant's
performance the best method of
sampling is
A. Grab sampling
B. Hourly sampling
C. Sampling during peak flow
D. Proportional composite sampling
E. Automatic sampling

BOD samples should be collected before B. Chlorine interferes with the activity of organisms
chlorination because
A. Chlorine reacts with the buffer solution
B. Chlorine interferes with the activity of
organisms
C. Chlorine reacts with the calcium ions
D. Chlorine affects the alkalinity

, ABC Wastewater Level 3 - Lab
A water sample is "fixed" in the field by C. Adding chemicals to prevent the changing of water quality
A. Keeping the sample in a Cipolletti
device
B. Anchoring the container to the stream
bed
C. Adding chemicals to prevent the
changing of water quality
D. Maintaining a constant sample
temperature of 95° F

The best procedure for determining the A. A 24-hr composite sample of the effluent
SS of a plant effluent is to analyze
A. A 24-hr composite sample of the
effluent
B. A grab sample of the effluent at high
flow
C. A grab sample of the effluent at low
flow
D. A series of grab samples taken at
different times during the day

, ABC Wastewater Level 3 - Lab
A sample obtained by taking portions of B. A weighted composite
wastewater at a collection point in
proportion to the flow is called
A. A most probable number (MPN)
B. A weighted composite
C. A routine sample
D. A bacterial-solids sample

Settleable solids by volume are D. An Imhoff cone
determined through the use of
A. A Nessler tube
B. A Kjeldahl flask
C. A Gooch crucible
D. An Imhoff cone