1 In anaerobic sludge digester, gases like methane, \(\mathrm{H}_{2} \mathrm{~S}\) and \(\mathrm{CO}_{2}\) are also produced.
2 Bacterial flocs are allowed to sediment in setting tank when BOD of sewage is high.
3 Primary treament of sludge is based on sequential filtration and sedimentation.
4 Activated sludge is pumped into anaerobic sludge digesters to digest the bacteria and fungi
Explanation:
The effluent from aeration tank is passed into a settling tank where the aerobic bacterial 'flocs' are allowed to sediment and the sediment is called activated sludge, when the BOD of sewage is high. Biogas is produced by the activity of anaerobic bacteria on activated sludge. Methano bacterium is an anaerobic bacteria found in rumen of cattle. Biogas is a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
BIOXII10: MICROBES IN HUMAN WELFARE
343946
The lower the BOD of sample water, indicates that
1 It is highly polluted
2 It is less polluted
3 It is moderately polluted
4 Pollution level cannot be determined
Explanation:
BOD is a measure of the organic matter present in water. Thus, greater the value of BOD in a sample of water, more will be its polluting potential. This indicates that are the water body will be highly polluted.
BIOXII10: MICROBES IN HUMAN WELFARE
343947
The microorganisms involved in floc formation during sewage treatment are:
1 Anaerobic bacteria and fungus
2 Aerobic bacteria and fungus
3 Autotrophic bacteria and yeast
4 Fungus and algae
Explanation:
An activated sludge is generated by aeration of sewage which consists of organic material containing large number of microorganisms consisting of bacteria (coliforms Clostridium, Psedomonas, etc.) and fungi that form a filamentous mesh-like filter and are called floc. This floc is then added to waster water coming in after primary treatment. The mixture is aerated and agitated. The microorganisms feed on the organic matter in the waste water and degrade it. After a sufficient period of time, the water is taken to a settling tank and allowed to settle.
1 In anaerobic sludge digester, gases like methane, \(\mathrm{H}_{2} \mathrm{~S}\) and \(\mathrm{CO}_{2}\) are also produced.
2 Bacterial flocs are allowed to sediment in setting tank when BOD of sewage is high.
3 Primary treament of sludge is based on sequential filtration and sedimentation.
4 Activated sludge is pumped into anaerobic sludge digesters to digest the bacteria and fungi
Explanation:
The effluent from aeration tank is passed into a settling tank where the aerobic bacterial 'flocs' are allowed to sediment and the sediment is called activated sludge, when the BOD of sewage is high. Biogas is produced by the activity of anaerobic bacteria on activated sludge. Methano bacterium is an anaerobic bacteria found in rumen of cattle. Biogas is a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
BIOXII10: MICROBES IN HUMAN WELFARE
343946
The lower the BOD of sample water, indicates that
1 It is highly polluted
2 It is less polluted
3 It is moderately polluted
4 Pollution level cannot be determined
Explanation:
BOD is a measure of the organic matter present in water. Thus, greater the value of BOD in a sample of water, more will be its polluting potential. This indicates that are the water body will be highly polluted.
BIOXII10: MICROBES IN HUMAN WELFARE
343947
The microorganisms involved in floc formation during sewage treatment are:
1 Anaerobic bacteria and fungus
2 Aerobic bacteria and fungus
3 Autotrophic bacteria and yeast
4 Fungus and algae
Explanation:
An activated sludge is generated by aeration of sewage which consists of organic material containing large number of microorganisms consisting of bacteria (coliforms Clostridium, Psedomonas, etc.) and fungi that form a filamentous mesh-like filter and are called floc. This floc is then added to waster water coming in after primary treatment. The mixture is aerated and agitated. The microorganisms feed on the organic matter in the waste water and degrade it. After a sufficient period of time, the water is taken to a settling tank and allowed to settle.
1 In anaerobic sludge digester, gases like methane, \(\mathrm{H}_{2} \mathrm{~S}\) and \(\mathrm{CO}_{2}\) are also produced.
2 Bacterial flocs are allowed to sediment in setting tank when BOD of sewage is high.
3 Primary treament of sludge is based on sequential filtration and sedimentation.
4 Activated sludge is pumped into anaerobic sludge digesters to digest the bacteria and fungi
Explanation:
The effluent from aeration tank is passed into a settling tank where the aerobic bacterial 'flocs' are allowed to sediment and the sediment is called activated sludge, when the BOD of sewage is high. Biogas is produced by the activity of anaerobic bacteria on activated sludge. Methano bacterium is an anaerobic bacteria found in rumen of cattle. Biogas is a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
BIOXII10: MICROBES IN HUMAN WELFARE
343946
The lower the BOD of sample water, indicates that
1 It is highly polluted
2 It is less polluted
3 It is moderately polluted
4 Pollution level cannot be determined
Explanation:
BOD is a measure of the organic matter present in water. Thus, greater the value of BOD in a sample of water, more will be its polluting potential. This indicates that are the water body will be highly polluted.
BIOXII10: MICROBES IN HUMAN WELFARE
343947
The microorganisms involved in floc formation during sewage treatment are:
1 Anaerobic bacteria and fungus
2 Aerobic bacteria and fungus
3 Autotrophic bacteria and yeast
4 Fungus and algae
Explanation:
An activated sludge is generated by aeration of sewage which consists of organic material containing large number of microorganisms consisting of bacteria (coliforms Clostridium, Psedomonas, etc.) and fungi that form a filamentous mesh-like filter and are called floc. This floc is then added to waster water coming in after primary treatment. The mixture is aerated and agitated. The microorganisms feed on the organic matter in the waste water and degrade it. After a sufficient period of time, the water is taken to a settling tank and allowed to settle.
1 In anaerobic sludge digester, gases like methane, \(\mathrm{H}_{2} \mathrm{~S}\) and \(\mathrm{CO}_{2}\) are also produced.
2 Bacterial flocs are allowed to sediment in setting tank when BOD of sewage is high.
3 Primary treament of sludge is based on sequential filtration and sedimentation.
4 Activated sludge is pumped into anaerobic sludge digesters to digest the bacteria and fungi
Explanation:
The effluent from aeration tank is passed into a settling tank where the aerobic bacterial 'flocs' are allowed to sediment and the sediment is called activated sludge, when the BOD of sewage is high. Biogas is produced by the activity of anaerobic bacteria on activated sludge. Methano bacterium is an anaerobic bacteria found in rumen of cattle. Biogas is a mixture of gases such as methane, hydrogen sulphide and carbon dioxide.
BIOXII10: MICROBES IN HUMAN WELFARE
343946
The lower the BOD of sample water, indicates that
1 It is highly polluted
2 It is less polluted
3 It is moderately polluted
4 Pollution level cannot be determined
Explanation:
BOD is a measure of the organic matter present in water. Thus, greater the value of BOD in a sample of water, more will be its polluting potential. This indicates that are the water body will be highly polluted.
BIOXII10: MICROBES IN HUMAN WELFARE
343947
The microorganisms involved in floc formation during sewage treatment are:
1 Anaerobic bacteria and fungus
2 Aerobic bacteria and fungus
3 Autotrophic bacteria and yeast
4 Fungus and algae
Explanation:
An activated sludge is generated by aeration of sewage which consists of organic material containing large number of microorganisms consisting of bacteria (coliforms Clostridium, Psedomonas, etc.) and fungi that form a filamentous mesh-like filter and are called floc. This floc is then added to waster water coming in after primary treatment. The mixture is aerated and agitated. The microorganisms feed on the organic matter in the waste water and degrade it. After a sufficient period of time, the water is taken to a settling tank and allowed to settle.
