The design criteria for UASB and ASBR are the same or different? How do I design these reactors?
The upflow anaerobic sludge blanket (UASB) reactor has been recognized as an important wastewater treatment technology among anaerobic treatment methods. The objective of this study was to perform literature review on the treatment of domestic sewage using the UASB reactor as the core component and identifying future areas of research. The merits of anaerobic and aerobic bioreactors are highlighted and other sewage treatment technologies are compared with UASB on the basis of performance, resource recovery potential, and cost. The comparison supports UASB as a suitable option on the basis of performance, green energy generation, minimal space requirement, and low capital, operation, and maintenance costs. The main process parameters such as temperature, hydraulic retention time (HRT), organic loading rate (OLR), pH, granulation, and mixing and their effects on the performance of UASB reactor and hydrogen production are presented for achieving optimal results. Feasible posttreatment steps are also identified for effective discharge and/or reuse of treated water.
Priyanka Mehta The question is confused.
What do you mean by principle? - If you mean what they do, so yes, they both are anaerobic digesters for waste water treatment/Biogas generation. Or if you mean their working principle, so of course as their name suggests, they are different with different working principle.
Moreover, to design a reactor, you need to understand several different parameters and engineering basics in the related field, for which you need to study and research literature. You won't get any specific answers.
You can start here - https://en.wikipedia.org/wiki/Anaerobic_digester_types.
By the way previous post was proudly copy pasted by Dr Yash Lethwala from Article Review of Upflow Anaerobic Sludge Blanket Reactor (UASB) tec...
@Abhijeet Singh yes I give some references to her I forgot to mention that link.
UASB and ASBR are suspended growth anaerobic treatment processes.
UASB is the process wherein the influent is introduced at the bottom of the reactor and the flow moves upward through a sludge blanket composed of biologically formed granules.
These dense granules permit high organic loadings 4-12kgCOD/m3.d. Biomass concentration in the range of 30000-70000mg/L is achieved.The solid liquid separation is excellent in this system.
ASBR Anaerobic Sequencing Batch Reactor is a batch variation of the UASB. Thus both work on the same principle . Here a single reactor is used for filling reacting settling and decanting
Thanks Lehwala Yash Abhijeet Singh and Dr K N Sheth for your answers. The links provided are useful.
The answer of Dr K N Sheth satisfies the need to some extent.
But my specific question is design criteria for designing these reactors is unanswered.
How do I design this type of reactor?
The hydraulic detention time is 4-12 hours. Influent with COD 5000-15000 mg/L may give 75-90% removal.
The answer of Dr K N Sheth is highly accepted to me ,but i do have to stress upon the design and operating features of both reactors .Retention times are important and mass transfer limitations must be carefully investigated.
Effect of mass transfer on kinetics play important role Prof. Jamal Amous. Your concern is highly appreciated.
The external mass transfer considerations required to be studied are:
Soluble substrate and particulate substrate and
the Internal mass transfer considerations to be studied are:
Observed mass transfer rates in the system
Estimation of the extent of mass transfer impacts in anaerobic reactor
Effect of mass transfer on the observed substrate uptake rates and
mass transfer of intermediate metabolites
Normally HRT will be 8-10 hours at average flow and minimum 4 hours at the peak flow
Other process design parameters are SRT Solids retention time to be 30-50 days
Sludge blanket concentration 15-30kg VSS/m3 i.e approx.75kg of TSS/m3 on an average
"Wastewater Engineering Treatment and Reuse" by Metcalf and Eddy.. this book will definitely help u to design..
- Badges
- Science topic
- Similar topics
- Engineering
- Modeling