Question 22

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?

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Solution

A mixture of sewage (x) in water contains suspended solids, organic impurities, inorganic impurities, like nitrates, phosphates and metals (a), nutrients like phosphorous and nitrogen (b), disease-causing bacteria and other microbes.

Sewage is a complex mixture containing suspended solids, organic and inorganic impurities, nutrients, saprotrophic and disease causing bacteria and other microbes. The organic impurities include human faeces, animal waste, oil, urea (urine), pesticides, herbicides, fruit and vegetable waste. The inorganic impurities include nitrates, phosphates and metals. The nutrients include phosphorus and nitrogen.

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Q. A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?

Question 19

Match the items of Column I with the items of Column II with reference to sewage.

$\begin{matrix} C o l u m n I & C o l u m n I I (a) I n o r g a n i c i m p u r i t i e s & (i) p h o s p h o r u s a n d n i t r o g e n (b) O r g a n i c i m p u r i t i e s & (i i) n i t r a t e s a n d p h o s p h a t e s (c) N u t r i e n t s & (i i i) c h o l e r a a n d t y p h o i d (d) B a c t e r i a & (i v) p e s t i c i d e s a n d h e r b i c i d e s \end{matrix}$

Q. Match the impurities present in sewage with their types.

(i) Human faeces	(a) Inorganic
(ii) Metals	(b) Organic
(iii) Vibrio cholerae	(c) Bacteria

Q. Read the following statements (A-D) related to the composition of domestic wastewater and select the correct option stating true (T) and false (F).

A. Wastewater contains 0.3 % of impurities.
B. Suspended solids in wastewater include sand, silt and clay.
C. Colloidal materials like fecal matter, bacteria, cloth and paper fibres are present in wastewater.
D. Dissolved materials in waste water include nutrients like starch, nitrates and ammonia.

Question 2

Which type of organic and Inorganic impurities are present in sewage?

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Question 22 A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?

Question 22

A mixture (x) in water contains suspended solids, organic impurities, inorganic impurities (a), nutrients (b), disease causing bacteria and other microbes. Give names for (x), (a) and (b)?