Primary sludge containing trickling filter sludge is gravity
thickened in a circular tank with a diameter...
Primary sludge containing trickling filter sludge is gravity
thickened in a circular tank with a diameter of 12 ft, and side
water depth of 10.0 ft. The applied sludge is 2600 gpd with 4.5 %
solids (by wt.) and the thickened sludge withdrawn is 1300 gpd at
7.5 % solids (by wt.). The sludge blanket in the tank is 3.0 ft
deep. For odour control, and to enhance thickening, 45,000 gpd of
treated wastewater is pumped to the tank along with the sludge to
increase the overflow rate. Calculate the solids loading on the
tank, the solids capture efficiency, the overflow rate, and the
solids retention time in the tank, assuming that all the tank
solids are in the sludge blanket.
If the thickened sludge from the tank that is anaerobically
digested, at an SRT of 15 days with a VS destruction efficiency of
50%, calculate the size of the anaerobic digester, and the daily
methane production rate. Assume that the volatile fraction of
solids is 70%.
Solutions
Expert Solution
I
think the rate of treated wastewater should be 4500gdp rather than
45000 gpd
Turpentine flows by gravity from tank 1 to tank 2 through 24 m
of 1.5-inch diameter commercial steel pipe. Both tanks are open to
atmosphere. The tanks are large, so assume that the level of
turpentine in both tanks remains the same with time. The level of
tank 1 is 15 m higher than the level of tank 2 (indicated on the
schematic as z1 and z2). There are two standard 90° elbows and one
open gate valve in the...
following facilities the trickling filter, and the Aeration
basion are used for clarification of water and wastewater during
treatment.
Write short notes on each one of them with more emphasis on the
similarities and differences
in treatment processes, advantages and disadvantages between
them.
A small circular hole 6.00 mm in diameter is cut in the side of a large water tank, 14.0 m below the tank's water level. The top of the tank is open to the air.
What is the speed of efflux?
What is the volume discharged per unit time?
A serious odour is being emitted from the site of a trickling
filter. Discuss the reasons for this odour and how this reflects a
problem with the filter efficiency. What corrective measures can be
taken to control this nuisance?
Determine the size of the high rate trickling filter for the
following data: Sewage flow is 5 MLD; Recirculation factor is 1.89;
Raw wastewater BOD is 230 mg/L; BOD removed in PST is 30%; Final
desired BOD in the treated effluent is 25 mg/L
pls send the sol fast in rough only i need it urgent
Design a low rate trickling filter for secondary treatment of
sewage generated from 10,000 persons with rate of water supply 170
liters per capita per day. The BOD5 after primary treatment is 110
mg/L and BOD5 of final effluent should be 20 mg/L. Consider the
following equation, where C = 5.358.
(St/So)=(1)/(1+C((D^0.67)/(QL^0.5))
Now, design a high rate trickling filter for the data given
above except effluent BOD5 is 40 mg/l since polishing treatment is
provided after high rate trickling filter....
A gasoline storage tank drains by gravity to a tank truck; see
the drawing. The pipe line between the tank and the truck is 100 m
of 0.1 m diameter commercial steel pipe. The properties of gasoline
are given as, density=720 kg/m3, dynamic viscosity = 0.0006 kg/m.s.
Both tank and truck are open to the atmosphere, and the level in
the tank is 10 m above the level in the truck. What is the
volumetric flow rate of the gasoline?...
A gasoline storage tank drains by gravity to a tank truck; see
the drawing. The pipe line between the tank and the truck is 100 m
of 0.1 m diameter commercial steel pipe. The properties of gasoline
are given as, density=720 kg/m3, dynamic viscosity = 0.0006 kg/m.s.
Both tank and truck are open to the atmosphere, and the level in
the tank is 10 m above the level in the truck. What is the
volumetric flow rate of the gasoline?...
data:highrate trickling filter
pipe dia = 30m
deep = 1m
swage flow = 4.5mld
recirulation ratio = 1.4
bod of raw sewage = 250mg/l
bod removed in primary clarifier = 25%
efficiency?
(ans:74%)