Opportunities, Needs, And Strategic Direction For Research On Flocculation In Natural And Engineered Systems

Author(s):  
Steven Liss ◽  
Gary Leppard ◽  
Timothy Milligan ◽  
Ian Droppo
2000 ◽  
Vol 42 (12) ◽  
pp. 49-60 ◽  
Author(s):  
P.L. McCarty

Of recent concern is the removal of toxic compounds in wastewaters, soils, and groundwater to concentrations in the low microgram per litre level or less. Threshold limits to bioremediation exist and must be considered in biological treatment schemes to achieve such limits. These limits may be related to reaction kinetics or thermodynamics. Techniques for removing compounds below threshold levels exist that rely on appropriate approaches such as plug flow treatment. Novel biological methods exist for removal of refractory contaminants to low levels. Examples are provided for removal of trace levels of chlorinated solvents, such as tetrachloroethene (PCE) and trichloroethene (TCE), that employ dehalorespiration under anaerobic conditions or cometabolism under aerobic conditions. These approaches are currently being used in engineered systems or through natural attenuation for remediation of soils and groundwater. Successful results offer insights for similar removals of trace chemicals in both aerobic and anaerobic biological systems for treatment of wastewaters and sanitary landfills.


2017 ◽  
Vol 12 (4) ◽  
pp. 143-154
Author(s):  
V. A. SHAMAKHOV ◽  
◽  
L.G. KARANATOVA ◽  
A. I. BALASHOV ◽  
◽  
...  

2017 ◽  
Vol 31 (2) ◽  
pp. 69-82 ◽  
Author(s):  
Therese R. Viscelli ◽  
Dana R. Hermanson ◽  
Mark S. Beasley

SYNOPSIS Since the early 2000s, expectations have increased for organizations to strengthen corporate governance with enterprise risk management (ERM) processes, with the accounting profession playing a major role in these efforts. The ultimate goal of an effective ERM process is to help boards and senior executives to manage risks in the context of strategy so that the organization is more likely to achieve its key objectives. We conduct semi-structured interviews of 15 ERM champions to provide insights about whether the ERM process is integrated with the strategic-planning and execution processes of the firm. We find that while the decision to launch ERM often is based on a desire for ERM to provide strategic value, the integration of ERM with strategy typically is limited. We then examine the ERM implementation process to identify possible ERM implementation practices limiting ERM's integration with strategy. We find that organizations' (1) culture and approach to preparing for ERM's launch, (2) ERM leadership structure, and (3) management of key risks appear to limit the intersection of ERM and strategy. Our summary of key findings highlights important considerations for boards of directors, executive management, and auditors as they assess the effectiveness of their risk oversight efforts in overseeing the strategic direction of the enterprise.


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