Английский для специалистов по защите окружающей среды и безопасности жизнедеятельности. Ульянова О.В. - 74 стр.

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These are essentially physical test procedures. They include monitoring

settleable solids by means of settleability tests, and are primarily used as

operational guideposts in both water and waste facilities. A sample is taken

(usually one liter) thoroughly mixed and allowed to settle. Imhoff cones and

settlometres are the common containers of choice here. The samples are

timed at various intervals to determine the ratio of solids and the volume of

solids that settle. Results can be transferable to plant operations to determine

proper flocculant doses, expected sludge volumes, adjusted waste and return

sludge in wastewater facilities. These are relatively simple test methods that

require no chemical or reagent to perform (except when determining floccu-

lant dosages), and they provide valuable data to a water operator.

20. Fill in the table.

Water testing methods

Substances to test Equipment to be

used

21. Write a brief summary of the text WATER TESTING METHODS.

22. Write a detailed description of the water test which you most often

perform or have performed.

23. Translate the text SAMPLING TECHNIQUE into Russian.

SAMPLING TECHNIQUE

All of the test methods described above require proper samples. Accu-

rate sample volumes for each test are important. There are some other impor-

tant points to remember.

• Choose the proper location in the water system from which to extract

your sample.

• Let the spigot run a short period of time to obtain a representative sam-

ple. (Note: applies only to a first draw sample. For lead or copper, dis-

regard this step.)

• Pour the correct volume of the sample into the test tube or jar. Accurate

results require accurate sample volumes.

• Once the test is complete, dispose of both the waste reagent and the

sample properly, and clean all test tubes thoroughly.