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Waste Management

Match the fol...

Question

Match the following correctly [3 MARKS]

$\begin{matrix} C l e a n i n g o f w a t e r i s a p r o c e s s o f & s e w a g e t r e a t m e n t p l a n t W a s t e w a t e r r e l e a s e d b y h o u s e s i s c a l l e d & r e m o v i n g p o l l u t a n t s D r i e d s l u d g e i s u s e d a s & l o w c o s t d i s p o s a l s y s t e m s D r a i n s g e t b l o c k e d b y & m a n u r e W a s t e w a t e r i s t r e a t e d i n & s e w a g e S e p t i c t a n k s, c h e m i c a l t o i l e t s, c o m p o s t i n g p i t s a r e e x a m p l e o f & c o o k i n g o i l s a n d f a t s \end{matrix}$

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Solution

Correct matching: 0.5 mark each

$\begin{matrix} C l e a n i n g o f w a t e r i s a p r o c e s s o f & r e m o v i n g p o l l u t a n t s W a s t e w a t e r r e l e a s e d b y h o u s e s i s c a l l e d & s e w a g e D r i e d s l u d g e i s u s e d a s & m a n u r e D r a i n s g e t b l o c k e d b y & c o o k i n g o i l s a n d f a t s W a s t e w a t e r i s t r e a t e d i n & s e w a g e t r e a t m e n t p l a n t S e p t i c t a n k s, c h e m i c a l t o i l e t s, c o m p o s t i n g p i t s a r e e x a m p l e o f & l o w c o s t d i s p o s a l s y s t e m s \end{matrix}$

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Q. Which of the following is not a correct step towards preventing water pollution?
(a) throwing waste paper into drains
(b) developing good sanitation system in rural areas
(c) disposing waste oil in your kitchen drains
(d) treatment of sewage before it is released into rivers

Q. Write True (T) of False (F) against the following statements in the given brackets:
1. Primary treatment of waste water is a mechanical process. ( )
2. Scum is removed with a skimmer. ( )
3. Septic tank is an example of on-site sewage disposal system. ( )
4. Aeration of clarified water kills disease-causing microbes. ( )
5. Sewer pipes are made up of case iron. ( )

Fill in the blanks:

(a) Cleaning of water is a process of removing _______.

(b) Wastewater released by houses is called ________.

(c) Dried _______ is used as manure.

(d) Drains get blocked by ________ and ________.

Q. Read the following statements & about waste water treatment how many of them are correct

(i) In Primary treatment First, floating debris of waste is removed by sequence filters
(ii) The Soil and small pebbles are removed by sedimentation in settling tanks
(iii)The sediment is called primary sludge and supernatant is effluent.
(iv) The Sludge is taken for Secondary treatment.
(v) Lower the B.O.D., higher Is water pollution.
(vi)When DDT enters the food chain then they reach water and are easily degradable.
(vii)Discharge of sewage water into river water will decrease its B.O.D.
(viii) Chlorine is added to disinfect drinking water

Q. Fill in the blanks:
1. The sewage is carried by big and small pipes called ................................ .
2. Dried sludge is used as a ................................ .
3. Tertiary treatment is a ................................ process.
4. ................................ consists of human excreta and other organic materials.
5. Drains get blocked by ................................ and ................................ .

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