Question

ᴇxᴘʟᴀɪɴ ᴛʜᴇ ᴅɪғғᴇʀᴇɴᴛ sᴛᴇᴘs ɪɴᴠᴏʟᴠᴇᴅ ɪɴ sᴇᴡᴀɢᴇ ᴛʀᴇᴀᴛᴍᴇɴᴛ ʙᴇғᴏʀᴇ ɪᴛ ᴄᴀɴ ʙᴇ
ʀᴇʟᴇᴀsᴇᴅ ɪɴᴛᴏ ɴᴀᴛᴜʀᴀʟ ᴡᴀᴛᴇʀ ʙᴏᴅɪᴇs.

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Answer 1

Sewage Treatment Process

Sewage contains a huge amount of organic matters which are toxic. Microorganisms are widely used in the sewage treatment plant for removing this toxic organic matter. Sewage or wastewater treatment plant consists of two stages.

Primary Treatment

It involves the removal of large or small-sized components in the wastewater through physical processes.

Biological Treatment:

Aerobic microorganisms are inoculated into the sewage treatment plant. These microbes utilize the organic components of the sewage and reduce the toxicity. This can be measured by BOD (Biological oxygen demand).

After the biological treatment, the sludge is pumped from the treatment plant into a large tank. This large tank consists of anaerobic bacteria which lead to the digestion of sludge. During digestion, biogas is produced and it is used as an energy source. Hence, Sewage treatment plant design and sewage management play a crucial role in the maintenance of human welfare.

Energy generation

Microorganisms which are involved in the production of energy are called microbial fuel cells. Microbial fuel cells are used to generate a variety of energy sources like biogas and electricity. Agricultural waste, manure, and domestic wastes are used as raw materials for the generation of biogas. Biogas generation is done in the large concrete tank which is called a biogas plant.

Biomasses (Biowastes) are collected at the biogas plant and the slurry is fed. Biomasses are rich in organic matter. Some of the bacteria can grow anaerobically inside the biogas plant. These bacteria can digest the biomasses which are present in the slurry and sewage. During digestion, a huge amount of mixture of gases is released inside the tank. The mixture of these gases is called the biogas. Biogas is removed from the biogas plant through a separate outlet.

Microbial fuel cells are also used to generate electricity from wastewater. Microbial fuel cells utilize the organic matter from the wastewater treatment plant. During digestion, organic matters are converted into the simple molecule and release the carbon dioxide and electrons. Those electrons are absorbed by the electrode and used as the source of electricity

Answer 2

Explanation:

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(ɪ) ᴘʀɪᴍᴀʀʏ ᴛʀᴇᴀᴛᴍᴇɴᴛ ᴏʀ ᴘʜʏsɪᴄᴀʟ ᴛʀᴇᴀᴛᴍᴇɴᴛ

• ɪᴛ ɪs ᴛʜᴇ ᴘʜʏsɪᴄᴀʟ ʀᴇᴍᴏᴠᴀʟ ᴏғ ʟᴀʀɢᴇ ᴀɴᴅ sᴍᴀʟʟ ᴘᴀʀᴛɪᴄʟᴇs ғʀᴏᴍ sᴇᴡᴀɢᴇ.

• ғɪʀsᴛ, ᴛʜᴇ ғʟᴏᴀᴛɪɴɢ ᴅᴇʙʀɪs ɪs ʀᴇᴍᴏᴠᴇᴅ ʙʏ sᴇǫᴜᴇɴᴛɪᴀʟ ғɪʟᴛʀᴀᴛɪᴏɴ ʙʏ ᴘᴀssɪɴɢ ᴛʜʀᴏᴜɢʜ ᴡɪʀᴇ ᴍᴇsʜ sᴄʀᴇᴇɴs.

• ᴛʜᴇɴ, ᴛʜᴇ ɢʀɪᴛ (sᴏɪʟ ᴀɴᴅ sᴍᴀʟʟ ᴘᴇʙʙʟᴇs) ᴀʀᴇ ʀᴇᴍᴏᴠᴇᴅ ʙʏ sᴇᴅɪᴍᴇɴᴛᴀᴛɪᴏɴ ɪɴ sᴇᴛᴛʟɪɴɢ ᴛᴀɴᴋs. ᴛʜᴇ sᴇᴅɪᴍᴇɴᴛ ɪs ᴄᴀʟʟᴇᴅ ᴘʀɪᴍᴀʀʏ sʟᴜᴅɢᴇ ᴀɴᴅ ᴛʜᴇ sᴜᴘᴇʀɴᴀᴛᴀɴᴛ ɪs ᴛʜᴇ ᴇғғʟᴜᴇɴᴛ.

• ᴛʜᴇ ᴇғғʟᴜᴇɴᴛ ɪs ᴛᴀᴋᴇɴ ғᴏʀ sᴇᴄᴏɴᴅᴀʀʏ ᴛʀᴇᴀᴛᴍᴇɴᴛ.

(ɪɪ) sᴇᴄᴏɴᴅᴀʀʏ ᴛʀᴇᴀᴛᴍᴇɴᴛ ᴏʀ ʙɪᴏʟᴏɢɪᴄᴀʟ ᴛʀᴇᴀᴛᴍᴇɴᴛ

• ᴘʀɪᴍᴀʀʏ ᴇғғʟᴜᴇɴᴛ ɪs ᴘᴀssᴇᴅ ɪɴᴛᴏ ʟᴀʀɢᴇ ᴀᴇʀᴀᴛɪᴏɴ ᴛᴀɴᴋs ᴡɪᴛʜ ᴄᴏɴsᴛᴀɴᴛ ᴍᴇᴄʜᴀɴɪᴄᴀʟ ᴀɢɪᴛᴀᴛɪᴏɴ ᴀɴᴅ ᴀɪʀ sᴜᴘᴘʟʏ.

• ᴜsᴇғᴜʟ ᴀᴇʀᴏʙɪᴄ ᴍɪᴄʀᴏʙᴇs ɢʀᴏᴡ ʀᴀᴘɪᴅʟʏ ᴀɴᴅ ғᴏʀᴍ ғʟᴏᴄs.

• ғʟᴏᴄs ᴀʀᴇ ᴍᴀssᴇs ᴏғ ʙᴀᴄᴛᴇʀɪᴀ ᴀssᴏᴄɪᴀᴛᴇᴅ ᴡɪᴛʜ ғᴜɴɢᴀʟ ғɪʟᴀᴍᴇɴᴛs ᴛᴏ ғᴏʀᴍ ᴍᴇsʜ-ʟɪᴋᴇ sᴛʀᴜᴄᴛᴜʀᴇs.

• ᴛʜᴇ ɢʀᴏᴡɪɴɢ ᴍɪᴄʀᴏʙᴇs ᴄᴏɴsᴜᴍᴇ ᴏʀɢᴀɴɪᴄ ᴍᴀᴛᴛᴇʀ ᴀɴᴅ ᴛʜᴜs ʀᴇᴅᴜᴄᴇ ᴛʜᴇ ʙɪᴏᴄʜᴇᴍɪᴄᴀʟ ᴏxʏɢᴇɴ ᴅᴇᴍᴀɴᴅ (ʙᴏᴅ).

• ᴡʜᴇɴ ʙᴏᴅ ᴏғ sᴇᴡᴀɢᴇ ʜᴀs ʀᴇᴅᴜᴄᴇᴅ, ᴛʜᴇ ᴇғғʟᴜᴇɴᴛ ɪs ᴘᴀssᴇᴅ ɪɴᴛᴏ sᴇᴛᴛʟɪɴɢ ᴛᴀɴᴋ.

• ʜᴇʀᴇ, ᴛʜᴇ ʙᴀᴄᴛᴇʀɪᴀʟ ғʟᴏᴄs sᴇᴛᴛʟᴇ ᴀɴᴅ ᴛʜᴇ sᴇᴅɪᴍᴇɴᴛ ɪs ᴄᴀʟʟᴇᴅ ᴀᴄᴛɪᴠᴀᴛᴇᴅ sʟᴜᴅɢᴇ.

• ᴀ sᴍᴀʟʟ ᴘᴀʀᴛ ᴏғ ᴛʜᴇ sʟᴜᴅɢᴇ ɪs ᴜsᴇᴅ ᴀs ᴀɴ ɪɴᴏᴄᴜʟᴜᴍ ɪɴ ᴛʜᴇ ᴀᴇʀᴀᴛɪᴏɴ ᴛᴀɴᴋ ᴀɴᴅ ᴛʜᴇ ʀᴇᴍᴀɪɴɪɴɢ ᴘᴀʀᴛ ɪs ᴘᴀssᴇᴅ ɪɴᴛᴏ ʟᴀʀɢᴇ ᴛᴀɴᴋs ᴄᴀʟʟᴇᴅ ᴀɴᴀᴇʀᴏʙɪᴄ sʟᴜᴅɢᴇ ᴅɪɢᴇsᴛᴇʀs.

• ɪɴ ᴛʜᴇ ᴅɪɢᴇsᴛᴇʀs, ʜᴇᴛᴇʀᴏᴛʀᴏᴘʜɪᴄ ᴍɪᴄʀᴏʙᴇs ᴀɴᴀᴇʀᴏʙɪᴄᴀʟʟʏ ᴅɪɢᴇsᴛ ʙᴀᴄᴛᴇʀɪᴀ ᴀɴᴅ ғᴜɴɢɪ ɪɴ sʟᴜᴅɢᴇ ᴘʀᴏᴅᴜᴄɪɴɢ ᴍɪxᴛᴜʀᴇ ᴏғ ɢᴀsᴇs sᴜᴄʜ ᴀs ᴍᴇᴛʜᴀɴᴇ, ʜʏᴅʀᴏɢᴇɴ sᴜʟᴘʜɪᴅᴇ ᴀɴᴅ ᴄᴏ2 ᴡʜɪᴄʜ ғᴏʀᴍ ᴛʜᴇ ʙɪᴏɢᴀs.

ᴛʜᴇ sᴇᴡᴀɢᴇ ᴛʀᴇᴀᴛᴍᴇɴᴛ ɪs ᴇssᴇɴᴛɪᴀʟ ʙᴇғᴏʀᴇ ʙᴇɪɴɢ ʀᴇʟᴇᴀsᴇᴅ ɪɴᴛᴏ ᴡᴀᴛᴇʀ ʙᴏᴅɪᴇs sᴏ ᴀs ᴛᴏ ᴄʜᴇᴄᴋ ᴡᴀᴛᴇʀ ʙᴏʀɴᴇ ᴅɪsᴇᴀsᴇs ᴏʀ ᴘᴀᴛʜᴏɢᴇɴɪᴄ ᴏʀɢᴀɴɪsᴍs ᴅᴜᴇ ᴛᴏ ᴡᴀᴛᴇʀ ᴘᴏʟʟᴜᴛɪᴏɴ.

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@Gurjari