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Showing posts from September, 2018

Activity 4: Process steps

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Main processes in a sewage treatment plant: PART ONE: SCREENING

Screening removes large objects like, diapers, nappies, sanitary items, cotton buds and even broken bottles, bottle tops, plastics and rags that may block or damage equipment. 
Special equipment is also used to remove grit that gets washed into the sewer.

PART TWO: PRIMARY TREATMENT

This involves the separation of organic solid matter from the wastewater. 
This is done by putting the wastewater into large settlement tanks for the solids to sink to the bottom of the tank. At the bottom of these circular tanks, large scrappers continuously scrape the floor of the tank and push the sludge towards the center where it is pumped away for further treatment. 

PART THREE: SECONDARY TREATMENT
The water, at this stage, is put into large rectangular tanks. These are called aeration lanes. Air is pumped into the water to encourage bacteria to break down the tiny bits of sludge that escaped the sludge scrapping process.

PART FOUR: FINAL T…

Activity 2: Main laboratory equipment and symbols

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Laboratory materials and symbols

IN THIS ACTIVITY  WE SEARCH THE NAMES OF THE LABORATORY MATERIALS





ºTO PROTECT YOUR EYES .................GOOGLES

ºFOR MEASURING THE TEMPERATURE.........THERMOMETER

ºFOR CLEANING INSIDE DE TUBE................WIRE BRUSH

ºFOR MEASURING MASS...........................WATCH GLASS

ºFOR REMOVING A HOLDING HOT BEAKER................BEAKER TONGS

ºTO PROTECT THE BOTTOM OF BEAKER OR FLASK FROM THE FLAME,TO 

ºSUPPORT BEAKER OR FLASK ON A RING CLAMP........................WIRE 
GAUZE

ºFOR HOLDING A FLASK,BEAKER OR A TEST TUBE ON A RING STAND..........TEST TUBE HOLDER

ºFOR HOLDING AN INDIVIDUAL TEST TUBE......................IRON RING

ºFOR HOLDING ONE OR MORE TEST TUBE.......................TEST-TUBE RACK

ºFOR MEASURINGAND POURING LIQUIDS,NOT FOR A HEATING OR 
MIXING SUBSTANCES...................GRADUATED CYLINDER

ºFOR MEASURING AN POURING LIQUIDS, FOR EATING AND MIXING SUBSTANCES..........................BEAKER

ºTO AID POURING LIQUID FROM A WIDE MOUTH CONTAINER TO A SMALL MOUTH C…