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Mariraj Mohan S, Swathi T. A review on upflow anaerobic sludge blanket reactor: Factors affecting performance, modification of configuration and its derivatives. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e1665. [PMID: 34837281 DOI: 10.1002/wer.1665] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2021] [Revised: 11/08/2021] [Accepted: 11/17/2021] [Indexed: 06/13/2023]
Abstract
The upflow anaerobic sludge blanket (UASB) reactor can be considered as one of the promising anaerobic wastewater treatment technologies suitable for the treatment of high-strength wastewater. In the recent period, researchers have focused on the treatment of low-strength wastewater using this technology. This review focuses on the key factors affecting the reactor performance such as hydraulic retention time (HRT), temperature, organic loading rate (OLR), pH and alkalinity, granulation, wastewater characteristics, mixing, and modification to conventional configuration. Start-up and granulation played a major role in the determination of reactor performance, and various theories have been proposed to understand the mechanism of granulation. Correlation between start-up time and OLR was found to be low, as other operating parameters might have been influencing the start-up time. Flowchart depicting the development of UASB reactor over time is included. In the present work, further development and derivatives of the UASB reactor such as static granular bed reactor (SGBR) and expanded granular sludge bed (EGSB) reactor are analyzed. The optimal conditions for UASB for treating various types of substrates was found to be HRT of 3-24 h, OLR of 1-15 kg COD/m3 /d, and operational temperature in mesophilic range (30-40°C). Analysis of various modifications that pave the way for identification of future areas of research to improve reactor performance is also presented.
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Affiliation(s)
- S Mariraj Mohan
- Department of Civil Engineering, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, India
| | - T Swathi
- Department of Civil Engineering, Alagappa Chettiar Government College of Engineering and Technology, Karaikudi, India
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Liu YQ, Cinquepalmi S. Exploration of mechanisms for calcium phosphate precipitation and accumulation in nitrifying granules by investigating the size effects of granules. WATER RESEARCH 2021; 206:117753. [PMID: 34688097 DOI: 10.1016/j.watres.2021.117753] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2021] [Revised: 10/06/2021] [Accepted: 10/07/2021] [Indexed: 06/13/2023]
Abstract
Calcium phosphate could be accumulated in aerobic granules, which attracts attention recently for phosphorus removal and recovery from wastewater. In this study, partial nitrifying granules with high calcium precipitate content were sorted into different size groups for characterization and evaluation to reveal the dynamic balance of granules at stead state and relevant calcium phosphate precipitation and accumulation mechanism. It was found that light yellow small granules without calcium precipitates but high microbial activity co-existed with deep brown granules with calcium precipitate of around 91% and low microbial activity. Characterization with specific oxygen uptake rates, specific ammonium oxidation rates, calcium and phosphate removal rates from solution, EPS contents, elemental compositions by energy dispersive X-ray spectroscopy (EDX), X-ray diffraction (XRD), and scanning electron microscopy (SEM) for different size groups of granules enabled a proposal of a new hypothesized mechanism for calcium precipitation and accumulation. With this proposed mechanism, it is believed that sufficient granule retention time in reactors was critical for the accumulation of calcium precipitates followed by a slow microbial growth rate of biomass due to mass transfer resistance. The co-precipitation of calcium carbonate and calcium phosphate mainly occurred in granules with a size less than 710 µm while calcium phosphate dominant minerals were accumulated in granules larger than 710 µm. The results and conclusions in this study shed light on the mechanisms of calcium phosphate accumulation in granules, which could be used to better operate and control aerobic granular sludge with calcium phosphates for phosphorus removal and recovery.
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Affiliation(s)
- Yong-Qiang Liu
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom.
| | - Simone Cinquepalmi
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton SO17 1BJ, United Kingdom
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Moerland MJ, Castañares Pérez L, Ruiz Velasco Sobrino ME, Chatzopoulos P, Meulman B, de Wilde V, Zeeman G, Buisman CJN, van Eekert MHA. Thermophilic (55 °C) and hyper-thermophilic (70 °C) anaerobic digestion as novel treatment technologies for concentrated black water. BIORESOURCE TECHNOLOGY 2021; 340:125705. [PMID: 34391186 DOI: 10.1016/j.biortech.2021.125705] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 07/27/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Thermophilic and hyper-thermophilic anaerobic digestion (AD) are promising techniques for the treatment of concentrated black water (toilet fraction of domestic wastewater collected by low flush volume toilets; BW), recovery of nutrients and simultaneous pathogen removal for safe recovery and reuse of those nutrients. This study showed that thermophilic AD (55 °C) of concentrated BW reaches the same methanisation and COD removal as mesophilic anaerobic treatment of BW (conventional vacuum toilets) and kitchen waste while applying a higher loading rate (OLR) (2.5-4.0 kgCOD/m3/day). With a retention time of 8.7 days, and an OLR of >3 kgCOD/m3/day, COD removal of 70% and a methanisation of 62% (based on CODt) was achieved during thermophilic AD. Hyper-thermophilic (70 °C) reached lower levels of methanisation (38%). Start-up time of thermophilic AD was 12 days. And during thermophilic AD, a shift from acetoclastic methanogenesis towards syntrophic acetate oxidation was observed.
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Affiliation(s)
- Marinus J Moerland
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | - Laura Castañares Pérez
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | - Maria E Ruiz Velasco Sobrino
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | | | - Brendo Meulman
- DeSaH B.V, Pieter Zeemanstraat 6, 8606 JR Sneek, the Netherlands.
| | - Vinnie de Wilde
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | - Grietje Zeeman
- LeAF B.V, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | - Cees J N Buisman
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
| | - Miriam H A van Eekert
- Department of Environmental Technology, Wageningen University and Research, Bornse Weilanden 9, 6706 WG Wageningen, the Netherlands.
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Rodrigues M, Paradkar A, Sleutels T, Heijne AT, Buisman CJN, Hamelers HVM, Kuntke P. Donnan Dialysis for scaling mitigation during electrochemical ammonium recovery from complex wastewater. WATER RESEARCH 2021; 201:117260. [PMID: 34107362 DOI: 10.1016/j.watres.2021.117260] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/20/2021] [Revised: 04/25/2021] [Accepted: 05/12/2021] [Indexed: 06/12/2023]
Abstract
Inorganic scaling is often an obstacle for implementing electrodialysis systems in general and for nutrient recovery from wastewater specifically. In this work, Donnan dialysis was explored, to prevent scaling and to prolong operation of an electrochemical system for TAN (total ammonia nitrogen) recovery. An electrochemical system was operated with and without an additional Donnan dialysis cell, while being supplied with synthetic influent and real digested black water. For the same Load Ratio (nitrogen load vs applied current) while treating digested black water, the system operated for a period three times longer when combined with a Donnan cell. Furthermore, the amount of nitrogen recovered was higher. System performance was evaluated in terms of both TAN recovery and energy efficiency, at different Load Ratios. At a Load Ratio 1.3 and current density of 10 A m-2, a TAN recovery of 83% was achieved while consuming 9.7 kWh kgN-1.
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Affiliation(s)
- Mariana Rodrigues
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands; Environmental Technology, Wageningen University, Bornse Weilanden 9 6708 WG Wageningen P.O. Box 17, 6700 AA Wageningen, the Netherlands
| | - Aishwarya Paradkar
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - Tom Sleutels
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands
| | - Annemiek Ter Heijne
- Environmental Technology, Wageningen University, Bornse Weilanden 9 6708 WG Wageningen P.O. Box 17, 6700 AA Wageningen, the Netherlands
| | - Cees J N Buisman
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands; Environmental Technology, Wageningen University, Bornse Weilanden 9 6708 WG Wageningen P.O. Box 17, 6700 AA Wageningen, the Netherlands
| | - Hubertus V M Hamelers
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands; Environmental Technology, Wageningen University, Bornse Weilanden 9 6708 WG Wageningen P.O. Box 17, 6700 AA Wageningen, the Netherlands
| | - Philipp Kuntke
- Wetsus, European Centre of Excellence for Sustainable Water Technology, Oostergoweg 9 8911MA Leeuwarden P.O. Box 1113, 8900 CC Leeuwarden, the Netherlands; Environmental Technology, Wageningen University, Bornse Weilanden 9 6708 WG Wageningen P.O. Box 17, 6700 AA Wageningen, the Netherlands.
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Mainardis M, Buttazzoni M, Goi D. Up-Flow Anaerobic Sludge Blanket (UASB) Technology for Energy Recovery: A Review on State-of-the-Art and Recent Technological Advances. Bioengineering (Basel) 2020; 7:E43. [PMID: 32397582 PMCID: PMC7355771 DOI: 10.3390/bioengineering7020043] [Citation(s) in RCA: 44] [Impact Index Per Article: 11.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/23/2020] [Revised: 04/28/2020] [Accepted: 05/08/2020] [Indexed: 01/04/2023] Open
Abstract
Up-flow anaerobic sludge blanket (UASB) reactor belongs to high-rate systems, able to perform anaerobic reaction at reduced hydraulic retention time, if compared to traditional digesters. In this review, the most recent advances in UASB reactor applications are critically summarized and discussed, with outline on the most critical aspects for further possible future developments. Beside traditional anaerobic treatment of soluble and biodegradable substrates, research is actually focusing on the treatment of refractory and slowly degradable matrices, thanks to an improved understanding of microbial community composition and reactor hydrodynamics, together with utilization of powerful modeling tools. Innovative approaches include the use of UASB reactor for nitrogen removal, as well as for hydrogen and volatile fatty acid production. Co-digestion of complementary substrates available in the same territory is being extensively studied to increase biogas yield and provide smooth continuous operations in a circular economy perspective. Particular importance is being given to decentralized treatment, able to provide electricity and heat to local users with possible integration with other renewable energies. Proper pre-treatment application increases biogas yield, while a successive post-treatment is needed to meet required effluent standards, also from a toxicological perspective. An increased full-scale application of UASB technology is desirable to achieve circular economy and sustainability scopes, with efficient biogas exploitation, fulfilling renewable energy targets and green-house gases emission reduction, in particular in tropical countries, where limited reactor heating is required.
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Affiliation(s)
- Matia Mainardis
- Department Polytechnic of Engineering and Architecture (DPIA), University of Udine, Via del Cotonificio 108, 33100 Udine, Italy; (M.B.); (D.G.)
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