Suchergebnisse

AbstractBuffer strips are permanently vegetated areas situated immediately adjacent to streams and provide an efficient and economical way to reduce nutrient loads from agricultural areas, but no studies exist of their effectiveness from the East African highlands. We thus evaluated the sediment filtering capabilities of natural herbaceous buffer strips under tropical highland climatic conditions. Overland flow samples were collected at field edges and at various positions in herbaceous buffers and tested for total suspended sediment, nitrate‐nitrogen and total phosphorus. There was a significant effect (P < 0.05) of distance from field edge on the mean values of nutrients. On average, a 10.0 m herbaceous buffer reduced the total phosphorus by 99%, total suspended sediment by 94% and nitrate‐nitrogen by 85%. Altogether, the results suggest that herbaceous buffer strips are important to include in watershed management in agriculturally dominated tropical highlands in order to control sediment loss, stream siltation and the washout of nutrients.

AbstractLow‐cost adsorbents, pumice (VPum) and scoria (VSco) were investigated for the removal of Cu(II) as function of various parameters. Batch experiments were conducted to evaluate the influence of Cd(II) and Ni(II) on the adsorptive removal of Cu(II) from aqueous solutions. Kinetic data showed a trend of fast removal at initial stages, thereby achieving maximum adsorption after 1 h agitation. The adsorption process well explained by pseudo‐second‐order kinetics for both adsorbents. Adsorption capacity were found 1.432 and 1.015 mg/g using VPum and VSco, respectively. This work showed the promising nature of pumice and scoria to effectively remove copper from water.

Session 3 Concepts or conditions of success for networked VET learning and teaching, especially for Further Education. Participants presented their concepts and conditions of success for a competence-based and networked VET Education and Further Education.

Following the theoretical approaches of sessions 1 and 2, session 3 presents ideas and models for Further Education concepts that were tested in practice. They come from nine African universities and one German university. The authors provide supportive and obstructive factors for competence-oriented Further Education in VET.