What is the working principle of UASB?
What is the working principle of UASB?
UASB uses an anaerobic process whilst forming a blanket of granular sludge which suspends in the tank. Wastewater flows upwards 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 UASB ETP?
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 the significance of Glss in UASB reactor?
GLSS enhanced the efficiency of the UASB reactor by increasing the settleability of suspended particles and accelerating the coagulation of colloidal particles due to the velocity gradient.
Who developed UASB reactor?
The UASB reactor was developed in the 1970s by Lettinga and his coworkers at the University for Agriculture at Wageningen in the Netherlands [11]. In the UASB reactor (Fig. 2.2C), the anaerobic bacteria form dense granules and it settles and remains as a blanket at the bottom of the reactor.
What are the major disadvantages of UASB?
UASB reactor schematic. A distinctive advantage of the UASB reactor is the very high loading rate achieved by the systems (Speece, 1996)….23.7. 1 Upflow anaerobic sludge blanket (UASB) reactor.
| Advantages | Disadvantages |
|---|---|
| Simple reactor construction | Sensitive response to organic shock loads |
What is the disadvantage of UASB?
What is the Colour of septic wastewater?
Explanation: The color of septic sewage is black or dark brown. It contains either little or no oxygen.
How does the wastewater enter in the UASB reactor?
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.
How does an Imhoff tank work?
Imhoff Tanks are simple form of sewage treatment plants requiring very little operator skill. There is no mechanical equipment to maintain and operation consists of removing scum, reversing the flow to keep an even distribution of sludge and removing sludge.
How does the wastewater enter the reactor of UASB?
In which phase of UASB reactor high concentration of biomass contain?
Generally, during the treatment of UASB reactor, the substrate passes through an expanded sludge bed which containing a high concentration of biomass first. After that, the remaining part of substrate passes through a less dense biomass which named the sludge blanket.
What is the BOD test?
The test for biochemical oxygen demand (BOD) is a bioassay procedure that measures the oxygen consumed by bacteria from the decomposition of organic matter (Sawyer and McCarty, 1978). The change in DO concentration is measured over a given period of time in water samples at a specified temperature.
What is the minimum pH to be maintained for the UASB process?
Clarification: The pH value needs to be between 6.3 and 7.85 to allow bacteria responsible for anaerobic digestion to grow. The pH value is also important because at high pH- values, ammonia disassociates to NH3 which inhibits the growth of the methane producing bacteria.
What is the difference between Imhoff tank and septic tank?
Explanation: The basic difference between both tanks is that Imhoff tanks are mainly for medium population and sewage with separate solid and liquid portions while septic tanks are for a smaller population with mixed sewage wastes. Imhoff tank is a V-shaped anaerobic treatment chamber for wastes.
What is BOD value of water?
BOD values range widely; generally, pristine waters have a value below 1 mg l−1, moderately polluted waters 2–8 mg l−1, and treated municipal sewage 20 mg l−1. Standards for the discharge of effluent from WWTPs have the range 20–30 mg l−1 and require a minimum flow in receiving waters to ensure sufficient dilution.
What is a UASB reactor?
Upflow anaerobic sludge blanket (UASB) technology, normally referred to as UASB reactor, is a form of anaerobic digester that is used in the treatment of wastewater. The UASB reactor is a methanogenic (methane-producing) digester that evolved from the anaerobic clarigester.
What does UASB stand for?
UASB Reactors (Upflow Anaerobic Sludge Blanket Reactors) Dr. Akepati S. Reddy School of Energy and Environment Thapar University, Patiala PUNJAB, INDIA 2. Anaerobic Treatment Process 3.
How does a UASB tank work?
UASB uses an anaerobic process whilst forming a blanket of granular sludge which suspends in the tank. Wastewater flows upwards 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.
Who is the author of UASB reactor treatment of sewage?
R.A.Barbosa and G.L.Sant’Anna Jr (1989).Treatment Of Domestic Sewage In An UASB Reactor.Wat . Res. Vol.23 , No. 12 pp 1483-1490,1989.