https://link.springer.com/content/pdf/10.2307%2F3343168.pdf

Development as Freedom

Statistics for Spatial Data.

Planet of slums

Much effort goes into building markets as a tool for economic and social development, often overlooking that in too many places social exclusion and poverty prevent many, especially women, from participating in and accessing markets. Building on data from rural Bangladesh and analyzing the work of a prominent intermediary organization, we uncover institutional voids as the source of market exclusion and identify two sets of activities – redefining market architecture and legitimating new actors – as critical for building ‘inclusive' markets. We expose voids as ‘analytical spaces' and illustrate how they result from conflict and contradiction among institutional ‘bits and pieces' from local political, community, and religious spheres. Our findings put forward a perspective on market building that highlights the ‘on the ground' dynamics and attends to the ‘institutions at play', to their consequences, and to a more diverse set of ‘inhabitants' of institutions.

Building Inclusive Markets in Rural Bangladesh : How Intermediaries Work Institutional Voids

Energy-efficient desalination and water treatment technologies play a critical role in augmenting freshwater resources without placing an excessive strain on limited energy supplies. By desalinating high-salinity waters using low-grade or waste heat, membrane distillation (MD) has the potential to increase sustainable water production, a key facet of the water-energy nexus. However, despite advances in membrane technology and the development of novel process configurations, the viability of MD as an energy-efficient desalination process remains uncertain. In this review, we examine the key challenges facing MD and explore the opportunities for improving MD membranes and system design. We begin by exploring how the energy efficiency of MD is limited by the thermal separation of water and dissolved solutes. We then assess the performance of MD relative to other desalination processes, including reverse osmosis and multi-effect distillation, comparing various metrics including energy efficiency, energy quality, and susceptibility to fouling. By analyzing the impact of membrane properties on the energy efficiency of an MD desalination system, we demonstrate the importance of maximizing porosity and optimizing thickness to minimize energy consumption. We also show how ineffective heat recovery and temperature polarization can limit the energetic performance of MD and how novel process variants seek to reduce these inefficiencies. Fouling, scaling, and wetting can have a significant detrimental impact on MD performance. We outline how novel membrane designs with special surface wettability and process-based fouling control strategies may bolster membrane and process robustness. Finally, we explore applications where MD may be able to outperform established desalination technologies, increasing water production without consuming large amounts of electrical or high-grade thermal energy. We conclude by discussing the outlook for MD desalination, highlighting challenges and key areas for future research and development.

https://par.nsf.gov/servlets/purl/10058665

Membrane distillation at the water-energy nexus: limits, opportunities, and challenges

Phytoplankton blooms containing elevated levels of cyanobacteria are common in wastewatertreatment plants. Microcystis aeruginosa, the most common freshwater cyanobacterial species, produces the hepatotoxin microcystin, which is a threat to human and environmental health. Blooms also affect the viability of treating and reusing water and cause problems when detritus accumulates in pipe and pumping delivery infrastructure. We proposed the application of hydrogen peroxide (H2O2) to induce cyanobacterial cell death. Spectral fingerprinting of phytoplankton into four groups (cyanobacteria, chlorophyta, diatoms, and cryptophyta) allowed for determination of equivalent chlorophyll-a (chl-a) concentrations contributed by photosynthetic pigments, an indicative measure of the photosynthetic activity of each phytoplankton group. This was used to establish the effect of H2O2 addition on phytoplankton in wastewater samples. The lowest H2O2 dose that caused statistically significant exponential decay of phytoplankton groups was approximately 3.0 x 10(-3) g H2O2/microg phytoplankton chl-a. At this dose, cyanobacteria and total phytoplankton exhibited a half-life of 2.3 and 4.5 h, respectively. Cyanobacteria decayed at a rate approximately twice that of chlorophyta and diatoms, and the combined chl-a of all phytoplankton groups decreased to negligible levels within 48 h of H202 application.

Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria and Other Phytoplankton from Wastewater

The use of hydrogen peroxide to remove cyanobacteria and microcystins from waste stabilization ponds and hypereutrophic systems

Purpose – This paper aims to present a definition of social marketing that considers the purpose and role of social marketing beyond behaviour change. Design/methodology/approach – The paper reviews present social marketing definitions and then bolsters its underlying theoretical structure with insights distilled from three schools of thought: macromarketing, transformative consumer research and the capability approach. Findings – Guided by the three theoretical streams, we introduce our definition, namely: social marketing is the application of marketing principles to enable individual and collective ideas and actions in the pursuit of effective, efficient, equitable, fair and sustained social transformation. Practical implications – We present a list of practical implications derived from our definition of social marketing. We stress that our social marketing definition better reflects the need to balance the effects (efficiency and effectiveness) and the process (equity, fairness and sustainability) of...

Redefining social marketing: beyond behavioural change

Toxin-producing cyanobacteria constitute a serious threat to human and environmental health. It is thus essential that an effective treatment guarantees the removal of cyanobacteria from wastewater before its inclusion in water recycling or environmental flow. Hydrogen peroxide (H2O2) has been shown to induce cyanobacterial decay in laboratory cultures. However, its application for the removal of cyanobacteria from wastewater treatment ponds under environmental conditions has not been investigated. To examine the effects of environmental factors, field trials were performed at both the mesocosm and full-scale levels. The mesocosm trial was completed under field conditions of incident radiation, with various H2O2 concentrations. A concentration of 1.1×10-4  gH2O2/μg chl-a resulted in a 32% decrease in cyanobacterial concentration after 24 h, and this approximate concentration was then applied to a wastewater treatment pond in the full-scale trial. In the full-scale experiment, intense spatial and temporal ...

Environmental Factors and the Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria from Waste Stabilization Ponds

Hydrogen peroxide (H2O2) is suggested to be an environmentally benign chemical that may be used for wastewater purification. A recent study on the application of H2O2 in a wastewater stabilization pond (WSP) showed that H2O2 is a promising method to decrease high amounts of potentially toxic cyanobacteria. However, WSPs are complex biological systems that require healthy bacterial, phytoplankton, and zooplankton communities for optimal performance. Therefore, if H2O2 is to be regularly used in WSPs, its effect on all components of a healthy WSP food web, including zooplankton, must be assessed. This study quantifies the acute toxicity of H2O2 to Moina and Daphnia, two zooplankton genera that are common in WSPs in Western Australia’s Mediterranean climate. The results indicate that Daphnia carinata is less susceptible to H2O2 than Moina sp., as mean survival time was significantly higher at concentrations ≥2  mg H2O2/L. Additionally, the LC50 was 5.6  mg  H2O2/L in Daphnia and 2  mg H2O2/L in Moina...

Dani Barrington

Papers

Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria and Other Phytoplankton from Wastewater

The use of hydrogen peroxide to remove cyanobacteria and microcystins from waste stabilization ponds and hypereutrophic systems

Redefining social marketing: beyond behavioural change

Environmental Factors and the Application of Hydrogen Peroxide for the Removal of Toxic Cyanobacteria from Waste Stabilization Ponds

Acute Toxicological Response of Daphnia and Moina to Hydrogen Peroxide