This contribution introduces a new perspective on the modelling of settling behaviour aimed at providing a unified description of the processes taking place both in primary and secondary settling tanks for a more detailed operation and control in Water and Resource Recovery Facilities (WRRFs). First, experimental evidence is provided pointing out the flocculation state of sludge as an important co

The analysis of a simplified activated sludge process (ASP) with one main dissolved substrate and one main particulate biomass has been conducted in steady-state conditions. The ASP is formed by a plug-flow reactor anda settler tank. The biomass growth rate is described by a Monod function. For this process, it is not possible to get an explicit expression for the effluent substrate concentration

Purpose: The present study was performed as part of an epidemiological study, the Inter99 Eye Study. The aim of the study was to describe refractive errors and visual acuity (VA) in a suburban Danish population.Methods: The Inter99 Eye Study comprised 970 subjects aged 30–60 years and included a random control group as well as groups at high risk for ischaemic heart disease and diabetes mellitus.

The sedimentation of a suspension is a unit operation widely used in mineral processing, chemical engineering,wastewater treatment, and other industrial applications. Mathematical models that describe these processes and may be employed for simulation, design and control are usually given as nonlinear, time-dependent partial differential equations that in one space dimension include strongly degen

Aim: There is a growing number of older people (65+) with dementia, and many family care partners are involved in making help-seeking choices. The aim of this study was to reveal how family care partners with an old relative with dementia proceed in the name of dignity in their desire to secure the best care possible while still maintaining their own dignity. Methods: Data were collected in 2009–2

Background: Stress-related disorders are increasing in western societies and are the main reason for sick-leave in Sweden. Previous research justifies occupation-based interventions to increase health and work ability. Aim: To investigate if the occupation-based intervention ReDO™-10 predicts work ability for women at risk for or on sick-leave. Material and Methods: A longitudinal cohort study des

Bacterial cell division is orchestrated by the Z ring, which is formed by single-stranded treadmilling protofilaments of FtsZ. In Streptomyces, during sporulation, multiple Z rings are assembled and lead to formation of septa that divide a filamentous hyphal cell into tens of prespore compartments. We describe here mutant alleles of ftsZ in Streptomyces coelicolor and Streptomyces venezuelae that