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Purifying pollutant indicators in tofu factory wastewater using a multi soil layering system

AIP Conference Proceedings 2023年第1期2583卷

作者： Aflizar Rini Mayyuliani Jamaluddin Amrizal 1Master's Program in Applied Food Security Payakumbuh State Agricultural Polytechnic Indonesia 26271 2Agricultural Water Nabagenebt Study Program Payakumbuh State Agricultural Polytechnic Indonesia 26271 3Technology Study Program Mechanization of Agriculture Payakumbuh State Agricultural Polytechnic Indonesia 26271

The MSL system used during this experiment was made in a field laboratory scale with dimensions (height 200 cm x width 50 cm x length 50 cm). The main component of the MSL system consists of a mixed soil layer (SML) arranged in a triangular soil horizon pattern and surrounded by a Split Rock layer as a permeable layer (SSP).SML is made from local natural resources, namely sandy clay loam, sawdust from coconut stalks (Cocos nucifera) and iron pellets from lathe waste with a dry weight ratio of 8 : 1.9 : 0.1. The Tofu factory wastewater is channeled into the MSL system with a hydraulic loading rate (HLR) of 3166 L/m2/hour utilizing the force of *** removal efficiency of Total Suspended Solids (TSS), Biochemical Oxygen Demand (BOD5), Chemical Oxygen Demand (COD), Nitrate-Nitrogen (NO3− −N), Phosphorus (PO4− −P), Oils and grease , Electric Conductivity (EC), Total Dissolved Solid (TDS) and Salt (NaCl) were 67, 97, 97, 99, 77, 99, 78, 64 and 81%, *** bad odor and color indicators of wastewater can also be efficiently removed with the MSL *** this fact, the MSL system is efficient and capable of removing organic matter, phosphorus, nitrogen, oil and grease, odor and *** system recommended for removing contaminants from Tofu Factory wastewater.

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Enhanced Degradation of Cefalexin Using Co2sno4@Rgo as an Effective Peroxymonosulfate Activator in Hybrid Ozonation System

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SSRN 2023年

作者： Nguyen, Lan Huong Nguyen, Xuan Hoan Nguyen, Van Long Pham, Van Thinh Thai, Van Nam Luu, Tran Le Tap, Van Huu Le, Hoang Nghiem 140 Le Trong Tan Street Tay Thanh Ward Tan Phu District Ho Chi Minh City Viet Nam HUTECH University 475A Dien Bien Phu Ward 25 Binh Thanh District Ho Chi Minh City Viet Nam Master Program in Water Technology Reuse and Management Vietnamese-German University Ho Chi Minh City Viet Nam Tan Thinh ward Thai Nguyen Viet Nam Ho Chi Minh City University of Natural Resources and Environment 236B Le Van Sy Street Ward 1 Tan Binh District Ho Chi Minh City Viet Nam

This study successfully developed a nanocomposite catalyst (Co2SnO4@rGO) at optimal composite ratio of 2:1 between Co2SnO4 and GO for effectively activation of peroxymonosulfate (PMS) to degrade cefalexin (CFX) from aqueous solution by hybrid ozonation system (O3/Co2SnO4@rGO/PMS). The CFX removal efficiency was compared in three oxidation systems, including O3, Co2SnO4@rGO/PMS and O3/Co2SnO4@rGO/PMS under various operational conditions of initial CFX concentration, PMS dosage, Co2SnO4@rGO catalyst dosage and solution pH over certain time period. The effect of co-existing anions and scavengers was studied to determine the CFX removal mechanisms. The characteristics of catalyst were analyzed using SBET, SEM, EDS and mapping, XRD and pHPZC. The results illustrated that supplementation of O3 into Co2SnO4@rGO/PMS system exhibited the highest degradation and mineralization efficiencies of CFX, reaching 99.93% and 67.03%, respectively, under optimal operational condition of 100 mg/L of initial CFX, 300 mg/L of PMS dosage, 0.3 g/L of catalyst dosage at pH of 7.0 over certain time period. At this condition, the CFX degradation and mineralization rates in O3/ Co2SnO4@rGO/PMS system were higher than those in Co2SnO4@rGO/PMS system by 2.8 and 1.32 times, respectively, thanks to synergistic effect of O3 and Co2SnO4@rGO/PMS in the same reactor. The CFX removal mechanisms were proposed through both pathways: non-radical and radical pathway. The non-radical mechanism was through singlet oxygen (1O2) formed due to activation of PMS by the rGO, Sn and Co in catalyst’s constituent and a neutral environment benefited for production of 1O2. Meanwhile, the free radicals of *OH, *SO4- and *O2 were produced by the Sn and Co in catalyst’s composition which activated PMS and enhanced decomposition of O3. Besides, the O3 effectively activated PMS to form more free radicals. Then, all these formed free radicals were responsible for the promoted degradation and mineralization of CFX via radical

关键词： Free radicals

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Land use change in the Vietnamese Mekong Delta: Long-term impacts of drought and salinity intrusion using satellite and monitoring data

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iScience 2025年第6期28卷

作者： Doan Van Binh Dung Duc Tran Vũ Hoàng Thái Dương Jonas Bauer Edward Park Ho Huu Loc Master Program in Water Technology Reuse and Management Faculty of Engineering Vietnamese German University Binh Duong 75000 Vietnam Center of Water Management and Climate Change (WACC) Institute for Environment and Resources (IER) Vietnam National University Ho Chi Minh City (VNU−HCM) Ho Chi Minh City Vietnam National Institute of Education Earth Observatory of Singapore and Asian School of the Environment Nanyang Technological University Singapore Karlsruhe Institute of Technology Karlsruhe Germany Earth Systems and Global Change Group (ESC) Wageningen University and Research (WUR) Wageningen the Netherlands

Drought and salinity intrusion (DSI) increasingly threaten agriculture and aquaculture in coastal regions. Focusing on the Vietnamese Mekong Delta (VMD), we examined how DSI from 2000 to 2020 influences rice cropping, aquaculture area, and rice yield across seven coastal provinces. In-situ discharge and salinity monitoring, combined with satellite-derived land use data and yield validation, revealed the highest DSI impacts during the 2010–2011, 2015–2016, and 2019–2020 dry seasons. Local governments employed strategies such as drought-tolerant rice, improved irrigation, and revised cropping schedules to mitigate losses, yet further investments remain vital. Our findings provide evidence-based insights for managing DSI and strengthening agricultural resilience in the VMD and other vulnerable deltas worldwide.

关键词： Earth-surface processes Remote sensing Agricultural land

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Contribution of Manggarai gate improvement to flood in Manggarai Village based on recorded flood event

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IOP Conference Series: Earth and Environmental Science 2021年第1期737卷

作者： T N A Kesuma D Saputra M Farid M S B Kusuma A A Kuntoro Civil Engineering Doctoral Program Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Jawa Barat Indonesia Civil Engineering Master Program Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Jawa Barat Indonesia Water Resources Engineering Research Group Faculty of Civil and Environmental Engineering Bandung Institute of Technology Bandung Jawa Barat Indonesia Center for Coastal and Marine Development Institut Teknologi Bandung Bandung Jawa Barat Indonesia

Manggarai Gate is one of the most important flood control structures of the Jakarta Flood Control System. Its performance capacity is a compulsory parameter for flood risk reduction of the Jakarta Flood Prone Area. This paper aims to evaluate the contribution of the capacity improvement of Manggarai Gate to reduce the flood hazard at Manggarai flood-prone areas located in the upper part of this gate. An additional gate section was conducted in 2015 as the structural flood hazard reduction effort to increase the capacity of this gate from 330 m3/s to 507 m3/s. Recorded floods characteristic event before and after this improvement was compared to determine the flood hazard changes during the flood observation period. Based on this determination results it is found that the contribution of the increment capacity of Manggarai gates in reducing the flood hazard depends on the sustainability of the river capacity, river water quality, and flood control operation. It could also be concluded the sustainability of the river capacity and river water quality is very sensitive to the social behavior of the community and the river stakeholder along the river catchment area in addressing the environmental condition of the river catchment area.

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Study of The Potential Expansion of New Rice Fields in Central Maluku District to Support Food Security in Maluku Province

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IOP Conference Series: Earth and Environmental Science 2019年第1期334卷

作者： N Rusmin S Edy A Robby K R Dwi Student Master Program of Agro-Industrial Technology Faculty of Agricultural Industrial Technology Padjadjaran University JatinangorIndonesia Soil and Water Engineering Department of Agriculture Engineering Biosystem Faculty of Agricultural Industrial Technology Padjadjaran University Jatinangor Indonesia Food Processing Technology Laboratory Department of Food Technology Faculty of Agricultural Industrial Technology Padjadjaran University Jatinangor Indonesia

Central Maluku district is one of the priorities region in the development of paddy fields in the province of Maluku. Maluku province was only able to meet the needs of 58% of the rice. Fulfillment needs rice is one of the Government's efforts in food self-sufficiency. Increased agricultural productivity through the extension of new rice fields became one alternative settlement in fulfilment of rice. The increase in rice production through the expansion of rice fields is still possible. The success of the process of the expansion of paddy fields depend on the expansion of the activities in the rice production. The process of the expansion of rice fields is preceded by feasibility investigation location. Feasibility study of the site was conducted to find out the feasibility of potential land with the observations in the field which is then processed and spatial dianalis in using ArcGIS software. Results of a survey investigating the Central Maluku with the total area of 594.29 ha based on the suitability of the land for the potential expansion of new acres of rice paddies 587.35 ha from 2 (two) subdistricts include North Eastern Seram Subdistrict Kobi m2 170.87 ha and North Seram Subdistrict covering 416.82 ha.

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Applicability of zirconium loaded okara in the removal and recovery of phosphorus from municipal wastewater

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IOP Conference Series. Earth and Environmental Science 2019年第1期266卷 012004-012004页

作者： Nguyen, T A H Ngo, H H Guo, W S Pham, T Q Cao, T H Nguyen, T H H Master’s Program in Environmental Engineering VNU Vietnam Japan University Luu Huu Phuoc My Dinh 1 residential area Nam Tu Liem Hanoi Vietnam Centre for Technology in Water and Wastewater School of Civil and Environmental Engineering University of Technology Sydney (UTS) 15 Broadway Ultimo NSW 2007 Australia Graduate University of Science and Technology Vietnam Academy of Science and Technology 18 Hoang Quoc Viet Cau Giay Hanoi Vietnam Faculty of Geology VNU University of Science 334 Nguyen Trai Thanh Xuan Hanoi Vietnam

Recently, there is a new trend to consider wastewater as a precious resource. Since phosphorus is a limited non-renewable element, and MAP (Magnesium Ammonium Phosphate - MgNH4PO4.6H2O) is a valuable slow-release fertilizer, the recovery of phosphorous as MAP has received special attention from scientists all over the world. However, the application of this process with municipal wastewater is still a challenge, due to low concentration of phosphorus and high volume of municipal wastewater. This study investigates the potential of reclaiming MAP from municipal wastewater by combination of adsorption and crystallization. Soybean milk residue (okara) was loaded with Zirconium (Zr) to prepare the adsorbent (ZLO). Adsorption and desorption experiments were conducted in a semi-pilot scale ZLO packed colum system. Effects of P: N: Mg molar ratios, chemical sources and temperature on the formation of MAP were examined in an attempt to identify the optimal crystallization conditions. The attained precipitate was characterized using XRD, SEM, FTIR techniques. It was found that the ZLO packed column adsorption-desorption system could pre-concentrate phosphorus from municipal wastewater up to 28.36 times, fitting well the minimum requirement (50 mg P/L) for the economical MAP recovery. Up to 95.19% of dissolved phosphorus in desorption solution was recovered at pH = 9, Mg: N: P molar ratio = 2:2:1, using a combination of MgCl2.6H2O and NH4Cl. The harvested MAP exhibited high purity (92.59%), high P-availability (89% by mass), and extremely low levels of heavy metals. The results prove that it is viable to recover MAP from municipal wastewater by employing ZLO as adsorbent, followed by crystallization. This paves the way for mining phosphorus from municipal wastewater and reducing okara as an agricultural byproduct in a green way.

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Small hydropower spot prediction using SWAT and a diversion algorithm, case study: Upper Citarum Basin

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AIP Conference Proceedings 2017年第1期1903卷

作者： Hadi Kardhana Doni Khaira Arya Iwan K. Hadihardaja Widyaningtyas Edi Riawan Atika Lubis 1Water Resources Engineering Research Group Faculty of Civil & Environmental Engineering Institut Teknologi Bandung (ITB) Indonesia 2Master of Civil Engineering Program Study Graduate School of ITB Indonesia 3Atmospheric Science Research Group Faculty of Earth Science and Technology ITB Indonesia

Small-Scale Hydropower (SHP) had been important electric energy power source in Indonesia. Indonesia is vast countries, consists of more than 17.000 islands. It has large fresh water resource about 3 m of rainfall and 2 m of runoff. Much of its topography is mountainous, remote but abundant with potential energy. Millions of people do not have sufficient access to electricity, some live in the remote places. Recently, SHP development was encouraged for energy supply of the places. Development of global hydrology data provides opportunity to predict distribution of hydropower potential. In this paper, we demonstrate run-of-river type SHP spot prediction tool using SWAT and a river diversion algorithm. The use of Soil and water Assessment Tool (SWAT) with input of CFSR (Climate Forecast System Re-analysis) of 10 years period had been implemented to predict spatially distributed flow cumulative distribution function (CDF). A simple algorithm to maximize potential head of a location by a river diversion expressing head race and penstock had been applied. Firm flow and power of the SHP were estimated from the CDF and the algorithm. The tool applied to Upper Citarum River Basin and three out of four existing hydropower locations had been well predicted. The result implies that this tool is able to support acceleration of SHP development at earlier phase.

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Superhydrophilic self-cleaning surfaces based on TiO₂ and TiO₂/SiO₂ composite films for photovoltaic module cover glass

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Applied Adhesion Science 2015年第1期3卷 1-9页

作者： Jesus, Magnum Augusto Moraes Lopes de Neto, João Trajano da Silva Timò, Gianluca Paiva, Paulo Renato Perdigão Dantas, Maria Sylvia S Ferreira, Angela de Mello Master Program in Materials Engineering Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil Ricerca Sul Sistema Energetico - RSE S.p.A Le Mose Piacenza 29100 Italy National Institute of Science and Technology on Mineral Resources Water and Biodiversity (INCT-Acqua) - Av. Antônio Carlos 627 Pampulha 31270-901 Belo Horizonte MG Brazil Chemistry Department Centro Federal de Educação Tecnológica de Minas Gerais – campus I Av. Amazonas 5253 Nova Suiça 30421-169 Belo Horizonte MG Brazil

Self-cleaning surfaces have excelled in recent years in energy and environmental fields. In particular, in solar energy area, these surfaces are used to avoid soiling accumulation on photovoltaic (PV) modules. So far TiO₂ has been widely used due to its photocatalytic activity and photo-induced superhydrophilicity. However, this oxide has some limitations since it reduces the glass transmittance and it rapidly reestablish the water contact angle in dark environments. In order to circumvent these limitations, composites TiO₂/SiO₂ have been proposed. For photovoltaic application, besides a good transparency in the wavelength region 300–1800 nm and self-cleaning properties, the coating should also present long durability and adequate adhesion to endure the outdoor conditions. Aiming at developing a coating with these properties, in this work, TiO₂/SiO₂ composites containing different titanium content have been synthesized and compared with pure TiO₂ films in relation to adhesion, transparency and hydrophilicity. Both films have been deposited over low iron float glass substrates by sol–gel dip-coating technique and different calcination temperatures (400, 500, 600°C) and Si/Ti molar rates (Si₈₆Ti₁₄, Si₄₀Ti₆₀) have been considered. TiO₂/SiO₂ films showed higher transmittance in visible range compared with pure TiO₂. TiO₂/SiO₂ films showed superhydrophilic character before and after ultraviolet irradiation, with water contact angles near to 0°. Furthermore, as predicted, TiO₂/SiO₂ films could keep the superhydrophilic character in dark environments, in contrast with pure TiO₂ films. Both TiO₂ and TiO₂/SiO₂ films exhibited good adherence and it is shown that higher calcination temperatures and higher titanium content enhance such property. All f

关键词： Self-cleaning surfaces Sol–gel Superhydrophilicity Thin film TiO2 TiO2/SiO2 composite

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Our experience with guiding a major design experience in civil engineering curriculum

Our experience with guiding a major design experience in civ...

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2001 ASEE Annual Conference and Exposition: Peppers, Papers, Pueblos and Professors

作者： Rad, Franz Huff, Scott Mohammadi, Azad McCormack, Thomas Richwine, Dale Portland State University Portland Community College Bureau of Water Works Portland Saint Martin's College Richwine Environmental Inc. Department of Civil Engineering Portland State University Eng. Mathematics and Technology Portland Community College Portland Oregon Department of Civil Engineering Master of Eng. Management Program Saint Martin's College

The authors have been involved in developing and offering a course for seniors in Civil Engineering at Portland State University for the past fifteen years. The course (Civil Engineering Design) began as an experimental course taken by students as an elective, but soon became a required course for all seniors. It is taught during the spring quarter of the senior year as a "capstone" course and constitutes the last required design course in the program. A course entitled "Engineering Project Management" is a precursor. The goals of the design course are to make it as near to actual design office practice as possible, for the instructors to "guide" the students as opposed to "lecture" them, arid to have practitioners guide the design projects.

关键词： Engineering education

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ACQUISITION OF REPRESENTATIVE GROUND-water QUALITY SAMPLES FOR METALS

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GROUND water MONITORING AND REMEDIATION 1992年第3期12卷 167-176页

作者： PULS, RW POWELL, RM Robert W. Puls is currently employed at the R.S. Kerr Environmental Research Laboratory (RSKERL) U.S. EPA in the Processes and Systems Research Division. He received a bachelor's degree in soil science from the University of Wisconsin-Madison and a master's degree in forest resources from the University of Washington. He received his Ph.D. in soil and water science (minor in analytical chemistry) from the University of Arizona. Following completion of his doctorate he worked on the High Level Nuclear Waste Repository Research Program (DOE) investigating the fate and transport of radionuclides in ground water. He has been employed at RSKERL since 1987. His recent publications have covered a range of topics including ground water sampling for inorganics colloidal transport in ground water organic-metal-mineral interactions aquifer remediation and metal and metalloid sorption-desorption reactions governing subsurface contaminant transport. Robert M. Powell is a project scientist with Man-Tech Environmental Technology Inc. at the R. S. Kerr Environmental Research Laboratory in Ada Oklahoma. He is a graduate of the University of Oklahoma and spent eleven years with the Oklahoma Geological Survey (OGS) before joining ManTech six years ago. While at OGS he developed methods for the analysis of water and geologic materials primarily using atomic spectroscopy. He specializes in environmental chemistry as it relates to subsurface contaminant transport including studies of organic carbon in subsurface materials metal complexation surface charge effects on colloid transport and sampling methodologies.

R.S. Kerr Environmental Research Laboratory (RSKERL) personnel have evaluated sampling procedures for the collection of representative, accurate, and reproducible ground water quality samples for metals for the past four years. Intensive sampling research at three different field sites has shown that the method by which samples are collected has a greater impact on sample quality, accuracy, and reproducibility than whether the samples are filtered or not. In particular, sample collection practices that induce artificially high levels of turbidity have been shown to have the greatest negative impacts on sample quality. Results indicated the ineffectiveness of bailers for collection of representative metal samples. Inconsistent operator usage together with excessive purging generally resulted in excessive turbidity (>100 NTUs) and large differences in filtered and unfiltered metal samples. The use of low flow rate purging and sampling consistently produced filtered and unfiltered samples that showed no significant differences in concentrations. Turbidity levels were generally less than 5 NTUs, even in fine-textured glacial till. We recommend the use of low flow rates, during both purging and sampling, placement of the sampling intake at the desired sampling point, minimal disturbance of the stagnant water column above the screened interval, monitoring of water quality indicators during purging, minimization of atmospheric contact with samples, and collection of unfiltered samples for metal analyses to estimate total contaminant loading in the system. While additional time is spent due to use of low flow rates, this is compensated for by eliminating the need for filtration, decreased volume of contaminated purge water, and less resampling to address inconsistent data results.

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