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Exercise 1. Find the pronunciation of the following words and phrases, get ready to read them.

Sewage, wastewater, acceptable, desired, existing, concentration, municipal, worldwide, pre-chlorination, algae, growth, aeration, dissolved, coagulation, flocculation, polyelectrolytes, thicker, sedimentation, suspended, particles, desalination, salt, disinfection, for example, aerated lagoons, activated sludge, residential, institutional, commercial, establishments, liquid, baths, sewers, commerce, permitted, recycled, flushing toilets, aerobic, pump, municipal, typically, subject, standards, require, specialized, conventional, primary, secondary, tertiary.

Exercise 2. Give Russian equivalents of the following words:

combination, municipal, arrest, aeration, coagulation, formation, separation, filtration, disinfection, lagoon, active, filter, institution, commercial, toilet, storm, septic, tank, biofilter, aerobic, system, transport, station, collection, subject, local, federal, regulation, standard.

Exercise 3. Read and translate the text. Put the words in second column into the correct form to fill the gaps in the sentences. Choose an abstract of ten lines and get ready to read it aloud.

Sewage treatment

Sewage treatment, or domestic wastewater treatment, is the process of ______ contaminants from wastewater and household sewage, both runoff and domestic. Water _____ describes the processes used to make water more ______ for a ______ end-use. The goal of all water treatment process is to remove ______ contaminants in the water, or reduce the ______ of such contaminants. The combination of following processes ____ for municipal drinking water treatment worldwide: pre-chlorination - for algae control and arresting any biological growth; aeration - along with pre-chlorination for removal of ____ iron and manganese; ______ - for flocculation; coagulant aids, also _____ as polyelectrolytes - to improve coagulation and for thicker floc formation; sedimentation - for solids separation, that is, removal of suspended solids ______ in the floc; filtration - removing particles from water; desalination - process of removing salt from the water; disinfection - for ____ bacteria. ______ processes are also employed in the treatment of wastewater and these processes may include, for example, ____ lagoons, activated sludge or slow sand filters. Origins of sewage Sewage _____ by residential, institutional, and commercial and ______ establishments and _____ household waste liquid from baths, kitchens, and so on that is disposed via sewers. In many areas, sewage also includes liquid waste from industry and commerce. The separation and draining of household waste into greywater and blackwater _____ now more common in the _____ world, with greywater being permitted to be used for _____ plants or recycled for flushing toilets. Most sewage also includes some surface water from roofs and may include water from stormwater runoff. Process of treatment Sewage can _____ close to where it is created (in septic tanks, biofilters or aerobic treatment systems), or collected and transported via a network of pipes and pump stations to a municipal treatment plant. Sewage collection and treatment is ____ subject to local, state and federal regulations and standards. Industrial sources of wastewater often require specialized treatment processes. Conventional sewage treatment may involve four stages, called pre-treatment, ____, secondary and tertiary treatment.   remove   treat accept desire exist concentrate   use   dissolve coagulate know     trap     kill biology   aerate     create industry include     become develop water     treat     typical     prime

Date: 2015-12-17; view: 1069

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Exercise 3. Read the following numbers. | Exercise 2. Guess the meaning of the words without a dictionary.
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