What is UASB treatment?
Anaerobic Wastewater Treatment is a wastewater treatment system using biology that without using of air or oxygen. It aimed to remove organic pollution in wastewater, slurries and sludge. Anaerobic microorganisms convert organic pollutants into a “biogas” which contains methane and carbon dioxide.
What does UASB stand for?
The upflow anaerobic sludge blanket reactor (UASB) is a single tank process. Wastewater enters the reactor from the bottom, and flows upward. A suspended sludge blanket filters and treats the wastewater as the wastewater flows through it.
What is meant by UASB reactor state an advantage of it?
A distinctive advantage of the UASB reactor is the very high loading rate achieved by the systems (Speece, 1996). UASB reactors can be used for high-strength wastewaters with a volatile suspended solids (VSS):COD ratio of less than one and with COD concentrations between 500 and 20000 mg/L (Mulligan, 2002).
What is the working principle of UASB?
UASB uses an anaerobic process while forming a blanket of granular sludge which suspends in the tank. Wastewater flows upward through the blanket and is processed (degraded) by the anaerobic microorganisms. The upward flow combined with the settling action of gravity suspends the blanket with the aid of flocculants.
What is the minimum hydraulic retention time for UASB?
What is the minimum hydraulic retention time for UASB? Explanation: The hydraulic retention time should not be less than 2 hours.
What is the minimum percentage of solids in wastewater?
What is the minimum percentage of solids in wastewater? Explanation: The organic matter consists mainly of proteins, carbohydrates and fats. Between 40 and 65 % of the solids in an average wastewater are suspended.
What is the minimum pH to be maintained for the UASB process?
between 6.3 and 7.85
Explanation: The pH value needs to be between 6.3 and 7.85 to allow bacteria responsible for anaerobic digestion to grow.
How does the wastewater enter the reactor of UASB?
How does the wastewater enter the reactor? Explanation: Wastewater enters the reactor from the bottom and flows forward. A suspended sludge blanket filters and treats the wastewater as the wastewater flows through it. Explanation: Wastewater enters the reactor from the bottom and flows forward.
What is the upflow velocity considered for a UASB while treating 100% soluble COD?
Clarification: The upflow velocity considered for a UASB while treating 100% soluble COD is 1-3 m/h. In most cases, it is considered as 1.5 m/h. This is the velocity of the influent mixed with the biomass which is introduced at the bottom of the reactor.
What is hydraulic retention time?
Hydraulic retention time (HRT) is defined as the average time interval over which the substrate is kept inside the digester. The organic load rate (OLR) is determined as organic matter feed-in per unit time and volume of the reactor.
How is cod calculated?
There is a formula for calculating COD. Consider the formula for COD calculation: (a – b) X C X 8,000 / the volume of the sample in mL. Let “a” represent the titrant used for your sample expressed in mL. Let “b” represent the titrant used for your blank sample in mL.
What is sludge age?
The sludge age is the amount of time, in days, that solids or bacteria are under aeration. Sludge age is used to maintain the proper amount of activated sludge in the aeration tanks.