International audience | A heat and mass transfer model was developed to predict, during the drying of a food processing plant, the evolution of the water mass, wet surface, air temperature and relative humidity. The model was previously validated by comparing the predictions with the experimental results obtained in a food processing plant. Then, this model was coupled with a microbiological model to predict the fate of Listeria monocytogenes (growth or inactivation) at different locations in the plant (floor, wall and equipment). Simulations were carried out for blown air at 50%, 68% and 85% relative humidity in order to study the influence of air dehumidification in the plant on the drying rate and on the evolution of the microbial load. It was found that bacteria are more likely to develop on equipment when the drying time is longer. A technical solution involving heating of the equipment was proposed and the impact on the wet surface and the evolution of the microbial load was presented.

Pesticide helps to enhance agricultural production, however, it significantly affect both socio and environmental entities of a country. In Nigeria, pesticide is widely used, thus its traces have been detected in water, soil and air. Several studies have already indicated that most of the environmental ecology (air, water, and soil) in Nigeria has been contaminated by persistent organic pesticides like organochlorine and organophosphate. Other reasons of high pesticide residues present in Nigeria environment is due to inappropriate dosage applied of pesticides that leaves behind excess. However, its residues are found above safety levels in the air, water, and soil across the nation. Based on previous analysis, it is indicated that 125,000-130,000 metric ton pesticides are being applied annually in Nigeria. Despite banned of some pesticides such as dichlorodiphenyltrichloroethane- and -Hexachlorocyclohexane, they are still being used by farmers in their agricultural production. Many of the Class 1 (high extremely toxic) pesticides are still being used in developing countries like Nigeria. Hence, there is need to sensitize and educate the general public especially the end-users (farmers) particularly on management practices of pesticides. Considering these entire hazardous situations, in this article the history of pesticide used in Nigeria has been reviewed in detail. The article also discussed the effects of pesticide use in Nigerian waters, soil and on crops. The risk of residual pesticide on agricultural workers, pesticide residue risk preventive measures by the Federal Government of Nigeria, banned and restricted pesticides in Nigeria, Nigerian Government and its efforts to eliminate persistent organic pesticides in use are also reviewed in details.

The Songhua River is the largest river in northeastern China; the river’s water quality is one of the most important factors that influence regional ecological health and food safety in northeastern China and even the downstream of the Heilong River in Russia. In recent years, the Chinese government implemented several water resource protection policies to improve the river’s water quality. In order to evaluate the influence of the new policies on the water quality in the Songhua River, water quality data from 2006 to 2015 were collected monthly from the nine sites along the mainstream of the Songhua River. Results show that the water quality in the Songhua River could be divided into two groups during the last 10 years. Before 2010, water quality in the Songhua River was primarily influenced by regional human activities. Industries were the major pollutant sources in the upstream of the Songhua River. After several new policies were implemented by the local government in 2010, water quality in the Songhua River improved. As a result, the biodiversity of fish and ecological health in the Songhua River improved.

Human urine is an abundant, renewable resource that can be used as a valuable source of fertilizer because it is rich in nitrogen, phosphorus and potassium. As fertilizers derived from urine become more widely used, it is important to understand how excreted pharmaceuticals are transported from urine to the environment. Many pharmaceuticals are excreted from the human body in their native form; therefore, when urine is used as a fertilizer, biologically active pharmaceuticals can be released into the environment. The goal of this study was to develop sensitive methods for the analysis of pharmaceuticals in urine, struvite, lysimeter water, soil, and food crops using liquid chromatography with tandem mass spectrometry (LC-MS/MS). The ability to detect low levels of pharmaceutical residues in various environmental matrices will aid in assessing the potential risks associated with the field application of urine that is used to fertilize croplands. The optimized method reported in this paper, which utilizes solid phase extraction for sample clean-up and pre-concentration, offers analyte recoveries ranging from 29 to 112 percent, and detection limits ranging from 0.89 ng L⁻¹ to 0.0047 μg g⁻¹. The optimized extraction method provides intra-day and inter-day reproducibility of less than 10% for all analytes in all matrices investigated, with the exception for ciprofloxacin in urine. The use of isotope dilution for quantification proved necessary to compensate for matrix effects, especially in urine where matrix effects can range from about 21% to 79%. Overall, the method described here is robust and widely applicable to various types of environmental samples.

CGIAR Research Program on Water, Land and Ecosystems (WLE) | Berga Helen et al., 'Addressing transboundary cooperation in the Eastern Nile through the Water-Energy-Food Nexus: Insights from an E-survey and key informant interviews', , IFPRI, 2017

The Nile is the lifeblood of northeastern Africa, and its roles for and interdependency with the national economies it traverses and binds together grow as it moves from source to sea. With rapid economic development—population growth, irrigation development, rural electrification, and overall economic growth—pressures on the Nile’s water resources are growing to unprecedented levels. These drivers of change have already contributed to stark changes in the hydropolitical regime, and new forms of cooperation and cross-sectoral collaboration are needed, particularly in the Eastern Nile Basin countries of Egypt, Ethiopia, Sudan, and South Sudan. As direct sharing of water resources is hampered by unilateral developments, the need has increased for broader, cross-sectoral collaboration around the water, energy, and food sectors. This study is conducted to assess and understand the challenges of and opportunities for cooperation across the water-energy-food nexus nationally in Egypt, Ethiopia, and Sudan, as well as regionally across the Eastern Nile. To gather data, the paper uses an e-survey supplemented with key informant interviews geared toward national-level water, energy, and agriculture stakeholders, chiefly government staff and researchers. Findings from the survey tools suggest that most respondents strongly agree that collaboration across the water, energy, and agriculture sectors is essential to improve resource management in the region. At the same time, there is ample scope for improvement in collaboration across the water, energy, and food sectors nationally. Ministries of water, energy, and food were identified as the key nexus actors at national levels; these would also need to be engaged in regional cross-sectoral collaboration. Respondents also identified a wide range of desirable cross-sectoral actions and investments—both national and regional—chiefly, joint planning and operation of multipurpose infrastructure; investment in enhanced irrigation efficiency; joint rehabilitation of upstream catchments to reduce sedimentation and degradation; and investment in alternative renewable energy projects, such as wind and solar energy.

This paper explores the role of business cases as a tool for supporting decision-making processes regarding water management. Based on an analysis of survey and interview data from 300+ organisations within the European food sector, it is concluded that the relative emphasis on business cases and payback times influences the average level of water management engagement. However, the findings from the analysis also indicate that use of business cases are not set in stone but can be adapted and changed through ongoing dialogue and negotiations. The paper contributes to the existing academic literature by moving beyond generic discussions of the business case for corporate sustainability to exploring the concrete use of business cases as a decision-making tool for managers.

Universities have responsibilities for accelerating pedagogical innovation to enable a more sustainable future. This research work develops a three-phased approach for integrating principles of a circular economy system within a course in energy policy. The phases involve scanning available resources, identifying possible matches based on the quality of energy, namely exergy, and determining solution areas. The case study is a university-founded dairy facility in the province of Ankara, Turkey with a biogas production potential of 982 m³ per day. Four scenarios are analyzed based on options for combined heat and power, organic Rankine cycle, waste heat recovery, absorption chillers, ground source heat pumps, photovoltaic thermal arrays, and/or low-speed wind turbines. In total, 184.1 kWₑ of high exergy power and 285.3 kWₜ of low exergy thermal power may be produced. Further evaluation of the scenarios indicates that the level of exergy match may reach 0.87 while primary energy and primary exergy savings over separate energy production from renewables may be 38% and 61%, respectively. The solution areas can address aspects of an energy, water, and food nexus based on energy from waste, energy for irrigation and agriculture, and other linkages. The results are used to engage students in advancing the Sustainable Energy Action Plans of local municipalities. The approach has applicability to other cases in a time when pedagogical innovation is urgently needed to stimulate environmental sustainability.

Consumer preference for minimally processed foods has steadily increased for several years, while foodborne outbreaks from under-processed foods continue to be reported worldwide. We investigated the combination effect of ohmic heating with various essential oil components for inactivation of foodborne pathogens in buffered peptone water and salsa. We choose carvone, eugenol, thymol, and citral to combine with ohmic heating, which are registered for use as flavorings in foodstuffs. Combination treatment of ohmic heating with citral showed the most synergistic bactericidal effect against Escherichia coli O157:H7, Salmonella Typhimurium, and Listeria monocytogenes in buffered peptone water followed by thymol, eugenol, and carvone. When enumerated on selective media, the reductions were 4.8, 5.7, and 4.3 log CFU/ml for E. coli O157:H7, S. Typhimurium, and L. monocytogenes, respectively. Cell membrane destruction by combination treatment and the loss of cell membrane potential by essential oil components were proposed as the bactericidal mechanism. When applied in salsa, inactivation of bacterial pathogens was the greatest with the ohmic and thymol combination treatment followed by citral, eugenol, and carvone. A synergistic virucidal effect was observed for MS -2 bacteriophage, which was used as a norovirus surrogate. Color (b* values) of salsa were improved by combination treatment of ohmic heating and thymol compared to ohmic treated samples. Therefore, the combination treatment of ohmic heating and thymol could be used effectively to pasteurize salsa.

Raingardens capture and filter urban stormwater using sandy soils and drought-tolerant plants. An emerging question is whether raingardens can also be used as vegetable gardens, potentially increasing their popularity and implementation. A successful vegetable raingarden will need to both retain stormwater and produce vegetables, despite potential water deficits between rainfall events. To determine whether raingardens can provide this dual functionality, we undertook a greenhouse pot experiment using two different substrates (loamy sand raingarden substrate and potting mix typical of containerised vegetable growing) and two methods of stormwater application (‘sub-surface’ and ‘surface’ watering) with the water quantity at each application determined by average Melbourne summer rainfall. Overall, potting mix produced bigger plants (biomass and leaf area) and greater yield than did the loamy sand. Yield effects were variable: tomato yield was unaffected by treatment, bean yield was greatest in potting mix, beetroot yield was greatest with sub-surface watering and parsley yield was greatest with surface watering. Bigger plants also had greater transpiration, which meant that stormwater retention was greatest for parsley and tomato plants growing in potting mix with surface watering. Although, a raingarden with potting mix and surface application of stormwater was optimal for producing food and retaining stormwater under our rainfall regime, potting mix could be problematic due to higher nutrient leaching and breakdown over time. Therefore, we recommend using a mix of loamy sand and potting mix. However, the choice of substrate and watering treatment require trade-offs between yield, stormwater retention and potential implications for water quality and long-term stability of hydraulic properties.