Article
Engineering, Environmental
Alba Pedrouso, Angeles Val del Rio, Nicolas Morales, Jose R. Vazquez-Padin, Jose Luis Campos, Anuska Mosquera-Corral
Summary: The study demonstrated that the anammox process can operate under municipal wastewater conditions without the need for a common acclimation period, shortening startup time. Nitrogen removal efficiency can be improved by increasing residual organic matter concentrations, and the anammox activity is significantly influenced by pH and temperature.
PROCESS SAFETY AND ENVIRONMENTAL PROTECTION
(2021)
Article
Environmental Sciences
Lisheng Wang, Wancong Gu, Yanchen Liu, Peng Liang, Xiaoyuan Zhang, Xia Huang
Summary: This paper summarizes the challenges and solutions of mainstream anammox-based process by reviewing the literature of the past decade. The slow growth rate of anammox bacteria and the need for enhancing bacteria retention are identified as the main challenges. Various methods to culture anammox bacteria and improve their activity are discussed. Other challenges include the elimination of nitrite oxidizing bacteria (NOB) and achieving the ideal ratio of NH4+ and NO2-. To overcome these challenges, composite control strategies based on low sludge retention time (SRT) and limited aeration are suggested. Interference from low temperature and influent components in actual wastewater treatment is addressed, as well as the use of coupling processes to reduce nitrate concentration in the effluent. The paper concludes with future prospects for the mainstream anammox-based process.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Review
Agricultural Engineering
Liang Zhang, Ling Jiang, Jiangtao Zhang, Jialin Li, Yongzhen Peng
Summary: Anaerobic ammonium oxidation (anammox) has great potential for nitrogen removal from mainstream wastewater. However, there are limitations to its direct application. This review summarizes the technical development of partial anammox and the mechanisms of achieving partial mainstream anammox through aeration and organic control.
BIORESOURCE TECHNOLOGY
(2022)
Review
Green & Sustainable Science & Technology
Hongjun Zhao, Yan Guo, Qunhui Wang, Ze Zhang, Chuanfu Wu, Ming Gao, Feng Liu
Summary: The mainstream partial nitritation/anammox (PN/A) process shows promise in reducing costs compared to traditional biological nitrogen removal. However, the nitrite production rate (NPR) is lower in the biological nitritation pre-treatment process, which limits the operation of the PN/A process with higher nitrogen loading rates. This study provides a comprehensive review of nitrite production processes, microbial species involved in biological nitritation, existing problems, and proposes a novel and promising PN/A process facilitated with photocatalyst oxidation.
Article
Engineering, Environmental
Rui Du, Harald Horn, Shenbin Cao
Summary: The discovery of anaerobic ammonium oxidation (anammox) offers a new opportunity for energy self-sufficiency in mainstream municipal wastewater treatment. Anammox processes can be enhanced by integrated nitrite production via partial nitrification (PN) and partial denitrification (PD). This article presents a roadmap for maximizing anammox in mainstream wastewater treatment by utilizing external carbon dosing and evaluating their economy, efficiency, and effectiveness.
CHEMICAL ENGINEERING JOURNAL
(2023)
Article
Engineering, Environmental
Soklida Hong, Mari-K. H. Winkler, Zhiwu Wang, Ramesh Goel
Summary: The study investigated the use of integrated fixed film activated sludge (IFAS) technology for simultaneous removal of nitrogen (N) and phosphorus (P) in municipal wastewater. The technology showed robust performance with high removal efficiencies for both TIN and P. The study also identified the key microbial groups responsible for the removal processes.
Article
Environmental Sciences
Damian Hausherr, Robert Niederdorfer, Eberhard Morgenroth, Adriano Joss
Summary: The study demonstrates that anammox thrive under mainstream conditions and can withstand typical process disruptions, such as fluctuations in dissolved oxygen levels and temperature. Additionally, anammox activity showed good stability in response to changes in organic loading rate at bench scale and pilot scale experiments.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Engineering, Environmental
Ming Li, Longzhi Liu, Zhiye Sun, Boyang Hu, Xinglin Li, Meichao Lan, Hong Guo, Baoan Li
Summary: In this study, a novel adsorption-biodegradation (A-B) process, using flocculation pretreatment as A-stage and nitritation-denitritation MABR as B-stage, was proposed to reduce carbon emissions from sewage treatment. The results showed that flocculation with polyaluminium ferric chloride (PAFC) could remove 27.37%-49.69% of organics from actual wastewater. The pretreated wastewater could be further treated by nitritation-denitritation MABR with low aeration pressure, achieving high removal efficiency of NH4+-N, total nitrogen (TN), and chemical oxygen demand (COD).
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Engineering, Environmental
Zhetai Hu, Shihu Hu, Liu Ye, Haoran Duan, Ziping Wu, Pei-Ying Hong, Zhiguo Yuan, Min Zheng
Summary: This study presents a new technology roadmap for wastewater management, focusing on resource recovery rather than pollutant removal. A novel use of FeCl3 in an integrated anaerobic wastewater treatment and anammox process was developed, showing stable suppression of nitrite-oxidizing bacteria and excess sludge reduction. Experimental assessments using a laboratory-scale system demonstrated good effluent quality, with potential for phosphorus recovery and bioenergy production. The system was found to have low energy consumption and a net energy production of about 0.11 kWh/m3-wastewater.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Hong Chen, Zhi Tu, Sha Wu, Guanlong Yu, Chunyan Du, Hong Wang, Enzhe Yang, Lu Zhou, Bin Deng, Dongbo Wang, Hailong Li
Summary: The novel process of partial denitrification (PD) coupled with anaerobic ammonium oxidation (AMX) shows great potential for nitrogen removal in municipal wastewater treatment. Research focuses on process mechanisms, microbial community characteristics, key operational parameters, stable operation, and control methods. Challenges lie in engineering and economic feasibility, full mainstream AMX application, and further study of PD-AMX mechanism optimization for better engineering practice.
Article
Engineering, Environmental
Pia Oyarzua, Patricia Bovio-Winkler, Claudia Etchebehere, Maria Eugenia Suarez-Ojeda
Summary: This study evaluated different molecular approaches for studying bacterial communities in an anammox reactor, finding that universal primers had low coverage, functional gene methods provided taxonomic resolution at the species level, and targeted qPCR primers showed consistency in quantification. Recommendations were made to consider genomic database updates and coverage when choosing a biomolecular approach.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2021)
Article
Engineering, Environmental
Anndee L. Huff Chester, Kiwon Eum, Michael Tsapatsis, Marc A. Hillmyer, Paige J. Novak
Summary: Utilizing zeolite-coated hollow fiber membranes improved the growth of anammox bacteria and total nitrogen removal in mainstream-type media. Increasing the quantity of zeolite further enhanced the retention of anammox bacteria and the removal of total nitrogen. Application of membranes with higher zeolite content in integrated fixed-film activated sludge (IFAS) or membrane-aerated biofilm reactor (MABR) systems could facilitate mainstream anammox.
ENVIRONMENTAL SCIENCE & TECHNOLOGY LETTERS
(2021)
Article
Green & Sustainable Science & Technology
Chihao Lin, Xiangmin Xiao, Yu-You Li, Jianyong Liu
Summary: Anaerobic ammonium oxidation (anammox) technology is seen as a promising alternative for wastewater treatment, with partial denitrification anammox (PDA) and partial nitritation anammox (PNA) being the mainstream processes. Comprehensive evaluation of their economic and environmental benefits is essential. The study proposed and analyzed two plant-wide processes, and showed that high rate activated sludge-PNA (HRAS-PNA) was more energy-efficient and cost-effective compared to chemically enhanced primary treatment-PDA (CEPT-PDA), with a significant decrease in total environmental impacts.
RENEWABLE & SUSTAINABLE ENERGY REVIEWS
(2023)
Article
Engineering, Environmental
Kai Lv, Dangcong Peng, Yun Han, Lifang Yu
Summary: Enrichment and accumulation of anammox bacteria in aerobic biofilm is crucial for successful nitrogen removal in municipal wastewater treatment plants. This study detected a relatively high percentage of anammox bacteria in the biofilm of two WWTPs in Xi'an, China, and estimated their contribution to nitrogen removal. These findings suggest that aerobic biofilm could enhance nitrogen removal in mainstream.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Zhiyao Wang, Min Zheng, Haoran Duan, Shihu Hu, Zhiguo Yuan
Summary: Sewage treatment with partial nitritation and anammox (PN/A) has gained attention for its potential to establish energy-neutral/positive sewage treatment plants. One key challenge for this process is the suppression of nitrite-oxidizing bacteria (NOB). This study proposes a three-stage configuration comprising a PN/A reactor, an acidic PN reactor, and an anammox reactor to address this challenge. Simulation results indicate that the three-stage process can achieve stable and high-quality effluent with a nitrogen removal efficiency over 90%.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Engineering, Environmental
Aina Soler-Jofra, Lisbeth Schmidtchen, Lluc Olmo, Mark C. M. van Loosdrecht, Julio Perez
Summary: This study investigates the short and long term impact of hydroxylamine on partial nitritation granular sludge. The results indicate that dissolved oxygen is the main factor determining the impact of hydroxylamine. Short term hydroxylamine feeding with low dissolved oxygen leads to higher hydroxylamine accumulation and N2O production, while long term hydroxylamine feeding reduces ammonium consumption rate.
Article
Engineering, Environmental
Xenia Juan-Diaz, Julian Carrera, Julio Perez
Summary: This study explored the operating conditions involved in the development of autotrophic aerobic granular sludge. The results showed that enhancing ammonium oxidation activity in the early phase was crucial for the stable development of autotrophic aerobic granular sludge.
JOURNAL OF WATER PROCESS ENGINEERING
(2022)
Article
Engineering, Environmental
Xenia Juan-Diaz, Lluc Olmo, Julio Perez, Julian Carrera
Summary: Mainstream partial nitritation/anammox (PN/AMX) has gained significant attention, and two-stage configurations have been proposed as an attractive technology. However, the process requires further improvement by designing a new technology to remove nitrate produced by anammox bacteria. A new reactor configuration coupling anammox with heterotrophic denitrification was developed, showing successful coexistence of both processes.
CHEMICAL ENGINEERING JOURNAL
(2022)
Article
Green & Sustainable Science & Technology
Julian Carrera, Oriol Carbo, Silvia Donate, Maria Eugenia Suarez-Ojeda, Julio Perez
Summary: The potential of high-rate activated sludge (HRAS) reactors for COD removal in urban wastewater treatment plants (WWTPs) was investigated. A pilot plant treating the effluent of a full-scale WWTP was studied for one year. The study found that HRAS performed better at higher sludge retention time (SRT) but experienced higher loss of organic matter at lower SRT. Coupling HRAS with autotrophic biological nitrogen removal (BNR) significantly improved energy generation.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Marti Rufi-Salis, Anna Petit-Boix, Sina Leipold, Gara Villalba, Joan Rieradevall, Eduard Moline, Xavier Gabarrell, Julian Carrera, Maria Eugenia Suarez-Ojeda
Summary: A paradigm shift is needed in wastewater treatment plants to move towards resource recovery. This study examines the environmental impacts of emergent wastewater treatment technologies and focuses on increasing energy self-sufficiency and nutrient recovery. The results show that a combined approach to phosphorus and energy recovery can reduce environmental impacts.
SCIENCE OF THE TOTAL ENVIRONMENT
(2022)
Article
Polymer Science
Gabriela Montiel-Jarillo, Diego A. Morales-Urrea, Edgardo M. Contreras, Alex Lopez-Cordoba, Edwin Yesid Gomez-Pachon, Julian Carrera, Maria Eugenia Suarez-Ojeda
Summary: The use of mixed microbial cultures and organic wastes and wastewaters as feed sources can reduce the production costs of polyhydroxyalkanoates (PHAs), but poses challenges to downstream processing. This study evaluated the effect of sodium hypochlorite pre-treatment combined with dimethyl carbonate or chloroform extraction solvents on PHAs recovery efficiency from mixed microbial cultures. The results showed that the combination of NaClO pre-treatment and DMC extraction solvent achieved higher recovery efficiency.
Review
Engineering, Environmental
Ana Vazquez-Fernandez, Maria Eugenia Suarez-Ojeda, Julian Carrera
Summary: This review discusses the metabolic routes of VFA generation, the impact of operational parameters on production yield and composition, and the application of energy-based metabolic models in predicting VFA composition, with a focus on the importance of the organic composition of waste.
JOURNAL OF ENVIRONMENTAL CHEMICAL ENGINEERING
(2022)
Article
Engineering, Environmental
Francisco de Borja Ojembarrena, Elena Fuente, Angeles Blanco, Carlos Negro
Summary: Accumulation of Cr(VI) in industrial fiber cement process water can affect product quality and health, and it needs to be removed to avoid environmental risks. The study found that cationic cellulose nanocrystals (CCNCs) have higher adsorption efficiency and lower cost compared to conventional adsorbents.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Review
Engineering, Environmental
Shentan Liu, Yangchen Zhang, Xiaojuan Feng, Sang-Hyun Pyo
Summary: This paper summarizes the common problems of constructed wetlands (CWs) and proposes corresponding optimized solutions, including thermal insulation and additional aeration in cold climates, choosing suitable plant species and planting patterns to enhance phytoremediation in CWs, using various methods to monitor and evaluate CW clogging, implementing anti-clogging measures, controlling greenhouse gas emissions during CW treatment, constructing and utilizing CW databases, designing appropriate CW types, and implementing strict technical management and supervision.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Norzila Mohd, Nazlina Haiza Mohd Yasin, Wan Hasnidah Wan Osman, Mohd Sobri Takriff
Summary: This study demonstrates that Chlamydomonas sp. is effective in removing nutrients from palm oil mill effluent and shows particular efficiency in the removal of ammonium and phosphate.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Mingzhen Zhang, Guijian Liu, Ruijia Liu, Jinzhao Xu, Wen Si, Yong Wei
Summary: Tieguanyin tea stem was used to synthesize modified biochar for the adsorption of copper and zinc. Among the modified biochar, Fe-BCs had the highest adsorption capacity, with Fe-BC650 being the best adsorbent. It reached adsorption equilibrium in 1 minute and had a maximum adsorption capacity of 303.5996 mg/g for Cu (II) and 254.0711 mg/g for Zn (II) in single-metal solutions. However, there were antagonistic impacts between Cu2+ and Zn2+.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Lingling Zhao, Qiaoshu Zhou, Yun Yang, Yuan Zhang, Yewei Qiu, Yanjun Chen, Xian Jin, Xiangjun Yang, Shixiong Wang
Summary: This research presents a method for selectively recovering gold from e-waste water using metal sulfides microspheres prepared by hydrothermal technique. The results show that the assistance of visible light significantly improves the gold adsorption performance of metal sulfides. The metal sulfides exhibit excellent gold adsorption properties, high selectivity, ultra-high adsorption capacity, and good recyclability.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Laishram Saya, W. Rameshwor Singh, Sunita Hooda
Summary: Organic-inorganic nanoblends, such as polysaccharide-blended-inorganic ones, have versatile applications and have gained significant research attention. In this study, a magnetic guar gum/graphene oxide nanocomposite blended with CuO was successfully prepared and investigated for its adsorption capacity for ciprofloxacin removal. The results showed that the nanocomposite exhibited excellent adsorption capacity and the adsorption process was spontaneous.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Umit Ecer, Sakir Yilmaz
Summary: A novel and effective catalyst Co@MIL-68(Fe)@Fe3O4@CM-BC was synthesized and used for the catalytic reduction of crystal violet in aqueous environments. The catalyst showed high efficiency in degrading crystal violet under specific conditions, and exhibited good regeneration performance.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Chi Zhang, Miao Zhang, Haohan Yang, Wei Cai, Jun Wu
Summary: Enhancing the bioaugmentation of common nitrifiers in the partial nitrification/anammox process can decrease the activity of nitrite oxidizing bacteria and increase the activity of anammox bacteria, leading to improved total nitrogen removal efficiency.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Runzhang Zuo, Dajun Ren, Yangfan Deng, Canhui Song, Yubin Yu, Xiejuan Lu, Feixiang Zan, Xiaohui Wu
Summary: This study found that fine bubble aeration in membrane bioreactors (MBR) can better control membrane fouling and reduce energy consumption. However, compared to fine bubble aeration, coarse bubble aeration released more proteins and polysaccharides, resulting in a decrease in functional bacteria and enzymes involved in nitrogen and phosphorus pathways.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Ch Tahir Mehmood, Jiekai Dai, Hanjun Zhao, Ziyi Zhong
Summary: Wirelessly powered photocatalyst-coated spheres (WPS) have been developed and demonstrated for various applications, including photodegradation and fouling control. These WPS are cost-effective, easy to fabricate, and have excellent visible light sources, making them suitable as carriers for photocatalysts.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Yifan Wang, Xiaoxuan Kang, Yuting Li, Ruyi Li, Chang Wu, Luyao Wang, Chongqing Wang, Tao Yang, Ming Ge, Zhangxing He
Summary: Cobalt/carbon nanofibers (Co/CNF) were prepared and exhibited excellent catalytic activity in the degradation of tetracycline by activating peroxodisulfate (PDS). The effects of process parameters on tetracycline removal were studied, and the reaction mechanism was confirmed through experiments.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Ting Wei, Yaqian Zhao, Jia Guo, Bin Ji, Alvaro Pun Garcia, Abraham Esteve Nunez
Summary: This study developed a novel lightweight substrate (Al-NLS) composed of aluminum sludge and polyurethane, and investigated its effectiveness in constructed wetlands (CWs). Results showed that Al-NLS had favorable adsorption capacities for phosphorus and removal efficiencies for pollutants in real domestic wastewater. It also positively influenced the microbial community. Therefore, Al-NLS can be considered as a new alternative substrate in CWs technology.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)
Article
Engineering, Environmental
Dabojani Das, Achinta Bordoloi, Heyang Yuan, Daniel J. Caldwell, Rominder P. S. Suri
Summary: This study evaluates the degradation kinetics of antibiotic resistance genes and mobile genetic elements in water matrices by ozone treatment. The results show that extracellular antibiotic resistance genes can be effectively removed, while intracellular genes are more resistant to degradation. The impact of wastewater matrix on gene degradation is minimal.
JOURNAL OF WATER PROCESS ENGINEERING
(2024)