Simultaneous treatment of graywater and waste gas in a biological trickling filter.

Biological processors are typically used in liquid- and gas-phase remediation as separately staged systems. This research presents a novel application of a biotrickling filter operated for simultaneous treatment of contaminants present in graywater and waste gas (ammonia and hydrogen sulfide). Liquid- and gas-phase contaminants were monitored via bioreactor influent/effluent samples over the course of a 300-day study. An oxygen-based bioassay was used to determine spatial location of the functional groups involved in the biodegradation of surfactants, dissolved hydrogen sulfide, and ammonium. Results indicated that a biotrickling filter is able to support the wide range of microbial species required to degrade the compounds found in graywater and waste gas, maintaining conversion efficiencies greater than 90% for parent surfactant compounds and waste gas constituents. These results provide evidence of an operational scheme that potentially reduces footprint size and cost of graywater/waste gas biotreatment.

"I'm a different kind of nurse": advice from nurses in rural and remote Canada.

The sustainability of the rural and remote nursing workforce in Canada is increasingly at issue as the country becomes more urbanized and the nursing workforce ages. In order to support the retention of nurses in rural and remote communities and the recruitment of nurses to these communities, we require a better understanding of what is important to rural and remote nurses themselves. As part of the in-depth interviews conducted within The Nature of Nursing Practice in Rural and Remote Canada, a national research project, registered nurses (RNs) were asked what advice they would have for new nurses, educators, administrators and policy makers. This is the first of two papers describing that advice. It focuses on RNs in acute care, long-term care, home care, community health/public health and primary care roles in rural and remote communities across the country. The RNs were generous with their advice and gave many rich examples. While they were enthusiastic about their nursing practice and encouraging of other nurses to work in rural settings, they were intent that improvements be made in several key areas: education available to new practitioners and themselves, working conditions for rural and remote nurses, leadership, organizational supports and policies that better support rural and remote practice and communities.

"There's rural, and then there's rural": advice from nurses providing primary healthcare in northern remote communities.

Nursing practice in remote northern communities is highly complex, with unique challenges created by isolation, geography and cultural dynamics. This paper, the second of two focusing on the advice offered by nurses interviewed in the national study, The Nature of Nursing Practice in Rural and Remote Canada, considers suggestions from outpost nurses. Their advice to new nurses was: know what you are getting into; consider whether your personal qualities are suited for northern practice; learn to listen and listen to learn; expect a steep learning curve, even if you are experienced; and take action to prevent burnout. Recommendations for educators were to offer programs that prepare nurses for the realities of outpost nursing and provide opportunities for accessible, flexible, relevant continuing education. The outpost nurses in this study counselled administrators to stay in contact with and listen to the perspectives of nurses at the "grassroots," and not merely to fill positions but instead to recruit outpost nurses effectively and remunerate them fairly. The study findings highlighted the multiple interrelated strategies that nurses, educators and administrators can use to optimize practice in remote northern communities.

Changes in microbial community composition and function during a polyaromatic hydrocarbon phytoremediation field trial.

The purpose of this study was to investigate the mechanism by which phytoremediation systems promote hydrocarbon degradation in soil. The composition and degradation capacity of the bulk soil microbial community during the phytoremediation of soil contaminated with aged hydrocarbons was assessed. In the bulk soil, the level of catabolic genes involved in hydrocarbon degradation (ndoB, alkB, and xylE) as well as the mineralization of hexadecane and phenanthrene was higher in planted treatment cells than in treatment cells with no plants. There was no detectable shift in the 16S ribosomal DNA (rDNA) composition of the bulk soil community between treatments, but there were plant-specific and -selective effects on specific catabolic gene prevalence. Tall Fescue (Festuca arundinacea) increased the prevalence of ndoB, alkB, and xylE as well as naphthalene mineralization in rhizosphere soil compared to that in bulk soil. In contrast, Rose Clover (Trifolium hirtum) decreased catabolic gene prevalence and naphthalene mineralization in rhizosphere soil. The results demonstrated that phytoremediation systems increase the catabolic potential of rhizosphere soil by altering the functional composition of the microbial community. This change in composition was not detectable by 16S rDNA but was linked to specific functional genotypes with relevance to petroleum hydrocarbon degradation.