Work-related determinants of return to work of employees on long-term sickness absence

Purpose. The aim of the study is to identify work-related determinants of return to work (RTW) of employees who are on long-term sickness absence.Method. The study was based on a sample of 926 employees on sickness absence ( maximum duration of 12 weeks). The employees filled out a baseline questionnaire and were subsequently followed until the 10th month after listing sick. Cox proportional hazards regression analyses were used to identify determinants of RTW.Results. Working in one of the vocational sectors public administration, construction, financial and commercial services, transport, or education ( P = 0.00) and having low co-worker support ( P = 0.01) were related to longer duration to RTW in the mulitvariate model. Having low supervisor support ( P = 0.01) was associated with a higher RTW rate.Conclusions. Vocational sector is a strong predictor of RTW. Especially employees from the sector education are slow as to RTW. The observed association between low supervisor support and RTW was unexpected. However, the study confirms earlier research on the association between low co-worker support and RTW.</p

Key physicochemical characteristics governing organic micropollutant adsorption and transport in ion-exchange membranes during reverse electrodialysis

The co-generation of electricity and electrodialysis of seawater in a hybrid system is a promising approach to overcome water scarcity. Reverse electrodialysis harvests energy from the salinity gradient, where seawater is used as a high salinity stream while secondary treated wastewater can be used as a sustainable low salinity stream. Treated wastewater contains organic micropollutants, which can be transported to the seawater stream. The current research establishes a connection between adsorption and transport of organic micropollutants in ion exchange membranes, using a cross-flow stack in adsorption and zero-current experiments. To mimic the composition of treated wastewater, a mixture of nineteen organic micropollutants of varied physicochemical characteristics (e.g. size, charge, polarity, hydrogen donor/acceptor count, hydrophobicity) at environmentally relevant concentrations was used. Depending on the charge, micropollutants develop different types of mechanisms responsible for short-distance interactions with ion-exchange membranes, which has a direct influence in their transport behavior. This study provides a rational basis for the optimization/design of next-generation ion-exchange membranes, in which the permeability toward organic micropollutants should be also included. This investigation highly contributes to understanding the potential hazard posed by organic micropollutants in reverse electrodialysis in seawater desalination systems, where treated wastewater is used as a low salinity stream