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For the survival of fish in a river stream, the minimum dissolved oxygen is prescribed
The minimum level of Dissolved Oxygen (DO) necessary in the rivers and streams is 4 mg/L (ppm) for the survival of fishes and aquatic animals.
The minimum level of Dissolved Oxygen (DO) necessary in the rivers and streams is 4 mg/L (ppm) for the survival of fishes and aquatic animals.
See lessIn a fully mechanised composting plant, involves
Self-cleansing velocity is defined as the minimum. velocity at which sewage should flow such that there is. no deposition or accumulation of particles along the. drain length. It is about 0.6 to 0.9 m/sec.
Self-cleansing velocity is defined as the minimum. velocity at which sewage should flow such that there is. no deposition or accumulation of particles along the. drain length. It is about 0.6 to 0.9 m/sec.
See lessIn treated sewage, 4 PPm of D.O. is essential
At least 4ppm of dissolved oxygen must be present in treated wastewater while discharging it into another water body for the survival of aquatic life. Although water molecules contain an oxygen atom, this oxygen is not what is needed by aquatic organisms living in natural waters
At least 4ppm of dissolved oxygen must be present in treated wastewater while discharging it into another water body for the survival of aquatic life. Although water molecules contain an oxygen atom, this oxygen is not what is needed by aquatic organisms living in natural waters
See lessDischarging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable.
Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
Assertion (A) : Discharging the effluents from the oxidation ponds just up stream of lakes or reservoirs is undesirable. Reason (R) : The discharged algae get settled in the reservoirs and cause anaerobic decomposition and other water qualities.
See lessThe width of a rectangular sewer is twice its depth while discharging 1.5 m/sec. The width of the sewer is
The width of the sewer is 1.36 m
The width of the sewer is
See less1.36 m
If the diameter of sewer is 225 mm, the gradient required for generating self cleansing velocity, is
Detailed Solution Diameter (mm) Gradient required to generate self-cleaning velocity Velocity generated in the sewer when running half full 100 1 in 60 0.58 m/sec 150 1 in 100 0.61 m/sec 225 1 in 120 0.79 m/sec
Detailed Solution
See lessDiameter (mm) Gradient required to generate self-cleaning velocity Velocity generated in the sewer when running half full
100 1 in 60 0.58 m/sec
150 1 in 100 0.61 m/sec
225 1 in 120 0.79 m/sec
pH value indicates acidity
The range goes from 0 - 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
The range goes from 0 – 14, with 7 being neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base.
See lessIf D is the diameter of upper circular portion, the overall depth of a standard egg shaped section, is
Standard egg-shaped sewers, also called as ovoid shaped sewer, and new or modified egg-shaped sewers are used in combined sewers. These sewers can generate self cleansing velocity during dry weather flow.
Standard egg-shaped sewers, also called as ovoid shaped sewer, and new or modified egg-shaped sewers are used in combined sewers. These sewers can generate self cleansing velocity during dry weather flow.
See lessIf 2% solution of a sewage sample is incubated for 5 days at 20°C and depletion of oxygen was found to be 5 ppm, B.O.D. of the sewage is
∴ BOD of the sewage is 250 ppm. The official notification of the ISRO Scientist CE will release by the Indian Space Research Centre (ISRO).
∴ BOD of the sewage is 250 ppm.
See lessThe official notification of the ISRO Scientist CE will release by the Indian Space Research Centre (ISRO).
The rate of accumulation of sludge in septic tanks is recommended as
Rate of accumulation of sludge – 30 litres/person/year. Cleaning period or removal of sludge: 6 to 12 months, mostly once in a year i.e. removal of sludge is less frequent.
Rate of accumulation of sludge – 30 litres/person/year.
See lessCleaning period or removal of sludge: 6 to 12 months, mostly once in a year i.e. removal of sludge is less frequent.