Article
Environmental Sciences
Dexiao Ma, Guozhao Ji, Lei Zhang, Dong Wang, Qi Liu, Fahim Ullah, Aimin Li
Summary: Mechanical compression can decrease the interfacial thermal resistance in sludge drying process, improving drying rates and efficiency. Increasing temperature and mechanical load, as well as decreasing thickness, can enhance drying rates, and the drying process involves a warm-up period and two falling rate periods.
SCIENCE OF THE TOTAL ENVIRONMENT
(2021)
Article
Green & Sustainable Science & Technology
Theresa Constanze Sichler, Christian Adam, David Montag, Matthias Barjenbruch
Summary: The agricultural sewage sludge utilization in Germany is becoming less important due to new laws requiring phosphorus recovery from sewage sludge in wastewater treatment plants. Different future disposal scenarios show that around 70-77% of phosphorus in sewage sludge will likely be recovered.
JOURNAL OF CLEANER PRODUCTION
(2022)
Article
Environmental Sciences
Joisman Fachini, Cicero Celio de Figueiredo, Ailton Teixeira do Vale
Summary: Enrichment of biochars to produce slow nutrient release fertilizers with minimal losses to the environment is a promising strategy. This study evaluated the dynamics of potassium (K) release from biochar-based fertilizers produced from sewage sludge (SS) and found that the release rate was significantly reduced compared to pure KCl mineral fertilizer. The type of biochar fertilizer and silica sand moisture level were found to affect the K release dynamics. At a moisture level of 10%, biochar fertilizers in the form of pellets and granules can be classified as slow-release fertilizers with the potential to increase the efficiency of K use in agriculture.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Green & Sustainable Science & Technology
Hao Zhang, Wen-Hui Liu, Cai-Xia Liu, Ping Sun, Yuan-Ping Zeng, Yun-Yan Gao, Hou-Feng Wang, Raymond Jianxiong Zeng
Summary: This study used solid sewage sludge and Pistia stratiotes to produce high-performance biochar, which was used to adsorb ammonia nitrogen and phosphate in wastewater. The results showed that the combination of Pistia stratiotes and chemical modification optimized the biochar's structure and improved its adsorption performance. The main mechanisms of adsorption included surface functional groups, ion exchange, chemical co-precipitation, electrostatic adsorption, and physical adsorption.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Green & Sustainable Science & Technology
Oraleou Sangue Djandja, Bin Duan, Lin-Xin Yin, Changqing Cao, Yaqi Shan, Jia Duo, Guodong Yao, Pei-Gao Duan
Summary: This study investigated the effect of ammonia solution on hydrothermal carbonization (HTC) of sewage sludge (SS). The addition of ammonia promoted hydrolysis of the SS and increased the yield of hydrochar (HC). The total organic carbon (TOC) of the aqueous phase was significantly improved compared to water alone, but decreased with increasing temperature. Ammonia addition resulted in the formation of N-heterocyclics as the main compounds in the aqueous phase, while O-containing compounds were predominant in water alone. Amines and ammonia promoted the formation of pyrazine derivatives, with pyrazine derivatives being the most represented in the aqueous phase. The nitrogen content in the HC increased with increasing temperature due to polymerization of N-compounds. Insoluble phosphorus in the HC was promoted by the basic environment created by ammonia addition.
SUSTAINABLE ENERGY TECHNOLOGIES AND ASSESSMENTS
(2022)
Article
Engineering, Environmental
Minghao Jin, Huan Liu, Hongping Deng, Han Xiao, Geng Lu, Hong Yao
Summary: This study systematically investigated the effects of Fenton-CaO composite conditioning on the behavior of arsenic during sludge treatment. The results showed that the Fenton-CaO treatment could significantly reduce the release of arsenic and the toxicity of the products.
Article
Environmental Sciences
Joanna Boguniewicz-Zablocka, Iwona Klosok-Bazan, Andrea G. Capodaglio
Summary: The sustainable management of biosolids from wastewater treatment is crucial, especially with the ban of some disposal options in many European countries. Solar drying technology offers a cost-efficient and energy-saving alternative to traditional thermal drying methods, with successful applications in countries like Germany and Poland. Research is being done on improving the efficiency of solar drying for sewage sludge, in line with the new National Waste Management Plan of Poland.
ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH
(2021)
Article
Green & Sustainable Science & Technology
Faraz Afshari, Ataollah Khanlari, Azim Dogus Tuncer, Adnan Sozen, Istemihan Sahinkesen, Giovanni Di Nicola
Summary: This study aimed to design an efficient and sustainable solar tunnel dryer for drying sewage sludge. Experimental findings showed the success of the quonset solar tunnel dryer design in dehumidification process of sewage sludge. Integrating fins to the quonset tunnel had significant positive effects on both thermal and drying performances.
Article
Environmental Sciences
Bike Bao, Fei Wang
Summary: Disposal of sewage sludge, a by-product of wastewater treatment, has become a challenging issue for the environmental protection industry. The research compared the pollutant release characteristics of municipal sludge and industrial sludge by collecting and drying samples of different types of sludge. The results showed that the odor problem of municipal sludge was significantly worse compared to industrial sludge, with a much higher odor index.
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
(2023)
Review
Environmental Sciences
Yao Xiao, Abdul Raheem, Lu Ding, Wei-Hsin Chen, Xueli Chen, Fuchen Wang, Sheng-Lun Lin
Summary: The quick rise in industrialization and urbanization has led to a significant increase in sludge production from wastewater treatment facilities, making sewage sludge management a critical environmental issue. Sewage sludge is a carbon-rich material that has facilitated the development of novel biochar production technologies for various applications.
Article
Engineering, Environmental
Jintao Cui, Haocheng Wang, Dwi Hantoko, Xiaoqang Wen, Ekkachai Kanchanatip, Mi Yan
Summary: To recover nitrogen and phosphorus from the treatment of sewage sludge using supercritical water gasification (SCWG), struvite crystallization was utilized. K2CO3 was added in SCWG to increase syngas production and enhance the migration of N and P for subsequent struvite crystallization. The effect of MgCl2 and pH on the removal of N, P, and COD and the purity of struvite was investigated. The results showed that the highest removal of N and P from the aqueous phase was achieved by struvite crystallization at pH 8, producing struvite with a purity of 93.3%.
JOURNAL OF WATER PROCESS ENGINEERING
(2023)
Article
Energy & Fuels
Zhidong Chen, Yichen Hou, Mingyu Liu, Guoqiang Zhang, Kai Zhang, Dongke Zhang, Lijun Yang, Yanqiang Kong, Xiaoze Du
Summary: A system integrating sewage sludge drying, incineration, and power generation was proposed and analyzed in terms of thermodynamics and economics. Among the three alternative schemes considered, Scheme 2 showed the best performance with the lowest electricity cost and a relatively short payback period.
Article
Environmental Sciences
Jun Gao, Lei Li, Shijie Yuan, Jing Sun, Sisi Chen, Bin Dong
Summary: The occurrence state of organic nitrogen (ON) in sludge has a significant impact on the anaerobic biotransformation process. The modified CNCPS method classified ON in sludge into three categories: PA (easily accessible), PB (moderately accessible), and PC (hardly accessible). Through analysis using PY-GCMS, it was found that PA consisted of extracellular amino acids, peptides, and proteins; PB consisted of genetic material, cell wall peptidoglycans, and intracellular proteins; and PC was the ON that cross-linked with complex macromolecules. The study investigated the conversion characteristics of PA, PB, and PC during sludge anaerobic digestion (AD) after thermal hydrolysis pretreatment (THP) at different temperatures (100-180 degrees C).
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Engineering, Environmental
Moh Moh Thant Zin, Diwakar Tiwari, Dong-Jin Kim
Summary: A sustainable struvite production pathway was proposed for the recovery of NH4+-N and PO43--P from sewage sludge through hydrolysis and incineration, achieving high recovery rates and producing struvite with excellent chemical composition and properties.
JOURNAL OF WATER PROCESS ENGINEERING
(2021)
Article
Engineering, Chemical
Yuhan Zhu, Qian Zhao, Dongyue Li, Jun Li, Wei Guo
Summary: The recovery of phosphorus from sewage sludge through pyrolysis with calcium additives can enhance the conversion of non-apatite inorganic phosphorus (NAIP) into more accessible apatite phosphorus (AP). Adding CaCO3 (2.5-20%) increased the proportion of AP in inorganic phosphorus (IP) at both 500 and 700 degrees C. The main form of P in biochar with CaCO3 was Ca5(PO4)3OH, and biochar with CaCO3 showed slower phosphorus release compared to biochar without CaCO3.
SEPARATION AND PURIFICATION TECHNOLOGY
(2023)
Article
Environmental Sciences
Michal Preisner, Marzena Smol, Mika Horttanainen, Ivan Deviatkin, Jouni Havukainen, Maris Klavins, Ruta Ozola-Davidane, Jolita Kruopiene, Beata Szatkowska, Lise Appels, Sofie Houtmeyers, Kati Roosalu
Summary: The study aims to review existing indicators on resource recovery in the implementation of circular solutions in the wastewater sector.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Engineering, Environmental
Jouni Havukainen, Ali Saud, Thomas Fruergaard Astrup, Petteri Peltola, Mika Horttanainen
Summary: With the trend of urbanization, the importance of sewage and sludge treatment is increasing. The method of treatment and utilization of digestate has a significant impact on environmental performance, with combustion and composting showing more advantages over pyrolysis. However, further development and assessment are needed for the pyrolysis technology.
Article
Green & Sustainable Science & Technology
Ivan Deviatkin, Sanna Rousu, Malahat Ghoreishi, Mohammad Naji Nassajfar, Mika Horttanainen, Ville Leminen
Summary: This study conducted circular economy workshops for six industrial companies in Finland to understand the current state of circular economy implementation. The results showed that only 25% of companies implemented circular economy principles, with a potential improvement of 36%. Most companies planned to use recycled inputs, develop products made of a single material, and design products suitable for primary recycling, while strategies related to information technologies and artificial intelligence were deemed less relevant.
Article
Engineering, Chemical
J. Bacher, L. Rintala, M. Horttanainen
Summary: The recycling of waste electrical and electronic equipment presents various challenges, including the loss of valuable metals and the generation of fines. This study compared the effects of two different types of crushers on the size reduction of waste mobile phones and found that a fast-rotating hammer mill produced better liberation but also more fines compared to a slow-rotating cutting mill. The fines fraction contained silicon, base metals, noble metals, and harmful elements, which need to be considered in further treatment.
MINERALS ENGINEERING
(2022)
Article
Green & Sustainable Science & Technology
Mariia Zhaurova, Jenna Ruokonen, Mika Horttanainen, Michael Child, Risto Soukka
Summary: The production of synthetic fuels is crucial for reducing transport emissions, however, it is not guaranteed to lead to greenhouse gas emission reductions. This study analyzes the effects of integrating a power-to-gasoline plant into an existing operational environment in Lappeenranta, Finland, and finds that the use of excess hydrogen and renewable energy sources can significantly reduce greenhouse gas emissions.
JOURNAL OF CLEANER PRODUCTION
(2023)
Article
Engineering, Environmental
Mari Hupponen, Jouni Havukainen, Mika Horttanainen
Summary: Waste management processes have undergone significant development in recent decades and will continue to evolve alongside their environmental impacts. This study examines the climate change impacts of waste management, specifically focusing on the historical development and possible future trends. Using the city of Lappeenranta in Finland as a case study, the study calculates the climate impacts of household waste management in 2009, 2019, and projected 2029 scenarios. The results demonstrate a considerable decrease in net climate change impact due to improved waste management practices, such as directing mixed residual waste to energy recovery instead of landfill. Furthermore, the findings highlight the importance of transitioning towards renewable energy sources and increasing recycling rates to further reduce the climate change impacts of waste management.
Article
Engineering, Environmental
Md. Musharof Hussain Khan, Jouni Havukainen, Arvo Niini, Ville Leminen, Mika Horttanainen
Summary: Liquid packaging board is a popular packaging medium for liquid food and beverages, but it generates a significant amount of waste. Current disposal methods, such as energy recovery and alternative raw materials usage, do not align with a circular economy. This study compared different recycling options for the plastic and aluminium components of liquid packaging board waste, using a consequential life-cycle assessment method. Results showed that plastic pallet production through mechanical recycling had the lowest environmental impact when renewable energy was used, while waste incineration for energy recovery had the highest impact. These findings are valuable for liquid packaging board manufacturers and other stakeholders.
Article
Environmental Sciences
Qaisar Munir, Mariam Abdulkareem, Mika Horttanainen, Timo Kaerki
Summary: Traditional concrete production contributes significantly to global warming, but industrially produced geopolymer concrete can be a viable alternative to mitigate these negative impacts. This study developed new geopolymer concrete mix designs using industrial side streams and conducted a life cycle assessment (LCA) to evaluate their environmental impacts compared to traditional concrete. The results showed that geopolymer concrete with lower amounts of sodium silicate and metakaolin exhibited better environmental performance. Increasing the concentration of recycled waste in concrete mixes can further improve the environmental performance of geopolymer concrete produced from industrial side streams.
SCIENCE OF THE TOTAL ENVIRONMENT
(2023)
Article
Materials Science, Multidisciplinary
Mohammad Naji Nassajfar, Marja Valimaki, Liisa Hakola, Kim Eiroma, Kirsi Immonen, Mariam Abdulkareem, Mika Horttanainen
Summary: The demand for printed electronics is expected to increase for IoT applications. Researchers are exploring the use of bio-based substrates and additive printing methods to improve the environmental performance of PE. Copper and graphite inks can be alternatives to silver inks for reducing environmental impact, but they have lower electrical conductivity. This study compares the environmental and electrical conductivity of silver, copper, and graphite inks and proposes suitable applications for each combination based on technical feasibility.
FLEXIBLE AND PRINTED ELECTRONICS
(2023)
Article
Green & Sustainable Science & Technology
Mariam Abdulkareem, Anastasija Komkova, Jouni Havukainen, Guillaume Habert, Mika Horttanainen
Summary: Global objectives to mitigate climate change have driven the development of geopolymer as a sustainable alternative to carbon-intensive cement in the construction industry. This study assessed the feasibility of using conventional and alternative precursors in geopolymer mixes for Belgium and Finland, considering environmental, economic, and resource availability indicators. Optimal precursor combinations were identified using a multi-objective optimization technique, and the compressive strength of the mixes was predicted through linear regression analysis.
Article
Green & Sustainable Science & Technology
Ali Saud, Jouni Havukainen, Petteri Peltola, Mika Horttanainen
Summary: Recovering and recycling nitrogen from waste streams can reduce the need for fossil-based fertilizers and improve food security. This study used life cycle assessment to evaluate the environmental performance of nitrogen recovery from sewage sludge in a wastewater treatment plant. Results varied depending on the recovery method used, with biochar-based nitrogen recovery showing the lowest global warming potential. This study highlights the importance of integrated resource recovery in wastewater systems for environmental and health benefits.
Article
Green & Sustainable Science & Technology
Anna Zaikova, Ivan Deviatkin, Jouni Havukainen, Mika Horttanainen, Thomas Fruergaard Astrup, Minna Saunila, Ari Happonen
Summary: This study investigates the factors influencing waste source-separation behavior in Russia and Finland using online questionnaires. The findings indicate significant differences in the factors affecting waste behavior between the two countries, providing recommendations for the development of recycling practices in different regions.
Article
Green & Sustainable Science & Technology
Anna Zaikova, Natalia Vinitskaia, Ivan Deviatkin, Jouni Havukainen, Mika Horttanainen
Summary: This paper presents a life cycle assessment of the municipal solid waste management system in Saint Petersburg and its neighboring Leningrad region, showing that separate collection of waste can greatly reduce the environmental impact.
Article
Green & Sustainable Science & Technology
Lars odegaard Bentsen, Narada Dilp Warakagoda, Roy Stenbro, Paal Engelstad
Summary: This study investigates uncertainty modeling in wind power forecasting using different parametric and non-parametric methods. Johnson's SU distribution is found to outperform Gaussian distributions in predicting wind power. This research contributes to the literature by introducing Johnson's SU distribution as a candidate for probabilistic wind forecasting.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Xing Liu, Qiuchen Wang, Yunhao Wen, Long Li, Xinfang Zhang, Yi Wang
Summary: This study analyzes the characteristics of process parameters in three lean gas ethane recovery processes and establishes a prediction and multiobjective optimization model for ethane recovery and system energy consumption. A new method for comparing ethane recovery processes for lean gas is proposed, and the addition of extra coolers improves the ethane recovery. The support vector regression model based on grey wolf optimization demonstrates the highest prediction accuracy, and the multiobjective multiverse optimization algorithm shows the best optimization performance and diversity in the solutions.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Cairong Song, Haidong Yang, Xian-Bing Meng, Pan Yang, Jianyang Cai, Hao Bao, Kangkang Xu
Summary: The paper proposes a novel deep learning-based prediction framework, aTCN-LSTM, for accurate cooling load predictions. The framework utilizes a gate-controlled multi-head temporal convolutional network and a sparse probabilistic self-attention mechanism with a bidirectional long short-term memory network to capture both temporal and long-term dependencies in the cooling load sequences. Experimental results demonstrate the effectiveness and superiority of the proposed method, which can serve as an effective guide for HVAC chiller scheduling and demand management initiatives.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Zhe Chen, Xiaojing Li, Xianli Xia, Jizhou Zhang
Summary: This study uses survey data from the Loess Plateau in China to evaluate the impact of social interaction on the adoption of soil and water conservation (SWC) technology by farmers. The study finds that social interaction increases the likelihood of farmers adopting SWC, and internet use moderates this effect. The positive impact of social interaction on SWC adoption is more pronounced for farmers in larger villages and those who join cooperative societies.
JOURNAL OF CLEANER PRODUCTION
(2024)
Article
Green & Sustainable Science & Technology
Chenghua Zhang, Yunfei Yan, Kaiming Shen, Zongguo Xue, Jingxiang You, Yonghong Wu, Ziqiang He
Summary: This paper reports a novel method that significantly improves combustion performance, including heat transfer enhancement under steady-state conditions and adaptive stable flame regulation under velocity sudden increase.
JOURNAL OF CLEANER PRODUCTION
(2024)