Search results

The purpose of this paper is to evaluate the influence of a mixture of nutrient solution, bacteria and biofilm on the consolidation, unconfined compression and desiccation characteristics of two soils that could be used in waste containment applications.

Experimental work was conducted to investigate the influence of biofilm on the desiccation, strength and consolidation characteristics of two barrier soils. The soils were evaluated with water alone and with a biofilm solution composed of nutrients, bacteria and exopolymeric substances (EPS). These solutions were mixed with a locally available clay (“red bull tallow” (RBT)) as well as a mix of 65 percent sand and 35 percent bentonite (65‐35 Mix).

Reductions in strength and increases in ductility are observed with biofilm amendment for two soil types. The shear strength was reduced from 413 to 313 kPa and from 198 to 179 kPa for RBT and 65‐35 Mix, respectively. Desiccation tests reveal an increase in moisture retention for early time increments in amended specimens, while both increases and decreases are noted after extended drying. Increases in the rate of consolidation and modest decreases in the compression and swell index were observed. In particular, the consolidation coefficient was increased from 0.036 to 0.064 cm²/min and from 0.060 to 0.093 cm²/min for RBT and 65‐35 Mix, respectively.

These results are useful in establishing the broader impacts of using biofilm as an additive to increase the performance (e.g. reduce hydraulic conductivity and increase resistance to crack formation) of barrier materials in waste containment applications. Moreover, the data provide insight into the geotechnical implications of biofilm‐producing methanotrophic activity that occurs naturally in the covers of municipal solid waste landfills.

Very little research has been published on the influence of biofilm on the behavior of barrier materials in general, and on geotechnical properties in particular. This paper is unique in making the connection between methanotrophic activity, soil modification and barrier material performance.

Contrasting two countries with different gender regimes and welfare states, Sweden and Tanzania, this paper aims to analyse how the institutional context affects the ways in which a neo-liberal reform agenda is translated into institutional changes and propose how such changes impact the preconditions for women’s entrepreneurship.

This study uses document analysis and previous studies to describe and analyse the institutions and the institutional changes. This paper uses Scandinavian institutional theory as the interpretative framework.

This study proposes that: in well-developed welfare states with a high level of gender equality, consequences of neo-liberal agenda for the preconditions for women entrepreneurs are more likely to be negative than positive. In less developed states with a low level of gender equality, the gendered consequences of neo-liberal reforms may be mixed and the preconditions for women’s entrepreneurship more positive than negative. How neo-liberalism impacts preconditions for women entrepreneurs depend on the institutional framework in terms of a trustworthy women-friendly state and level of gender equality.

The study calls for bringing the effects on the gender of the neo-liberal primacy of market solutions out of the black box. Studying how women entrepreneurs perceive these effects necessitates qualitative ethnographic data.

This paper demonstrates why any discussion of the impact of political or economic reforms on women’s entrepreneurship must take a country’s specific institutional context into account. Further, previous studies on neo-liberalism have rarely taken an interest in Africa.

The paper aims to discuss how life cycle assessment can be used in the early stage planning phase of new settlements.

By applying the life cycle methodology on the waste, water and wastewater system of a new carbon‐neutral settlement under planning in Norway, the authors discuss the pros and cons with applying this methodology in an early planning phase.

The LCA methodology enabled the authors to compare suggestions from interdisciplinary planning teams, relate them to the existing systems in Trondheim and provide quantitative results back to the decision‐makers, in this case the municipality. The environmental benefits of implementing alternative solutions in the waste, water and wastewater systems were found to be small.

Data availability and uncertainty can be limitations in the early planning phase.

By applying this methodology, the life cycle environmental impact of different solutions can be assessed at an early planning stage.

Even if life cycle assessment has been used for years in the research community, there is too little experience with applying the methodology in the early planning phase of new projects. This paper discuss how life cycle assessment can be used to compare suggestions from interdisciplinary planning teams, relate them to existing systems and provide quantitative results back to the decision‐makers.