This research aims to investigate the effects that Dredging may have on benthic fauna. The Dredging took place in the stream Ireån on northern Gotland during the early summer 2010. My area of research was taking place in a scenic area downstream in Ireån close to the Baltic Sea. I chose this area due to the Dredging that started just upstream of this area and continued further upstream. Thus it is not the direct impact of the Dredging that is the focus for this paper but the side-effect the Dredging may have on the area downstream.

There are today large amounts of contaminated sediments in the Baltic Sea. These contaminants are the result of many years industrial activity where the contaminants have not been taken care of and just released out in the water. When ports want to dredge in their fairways and harbor areas the contaminated sediments need to be considered since they are a environmental risk. The development in this area has been slow and new techniques have just recently made its way into Dredging operations in the Baltic Sea region. As a result of this there are no clear methods for implementing new techniques today.

Eutrophication has been a problem in aquatic systems for a long time. It is well known that the key nutrient to control the eutrophication process is phosphorus. Lately, it has been possible to reverse the process and recover lakes from eutrophication.During a long time Lake Näsnaren in Katrineholms kommun, Södermanland, has been exposed of a large amount of phosphorus from the city's wastewater. The lake has a great value as a habitat of rare species but also a high recreation value for people living in Katrineholm and Södermanland. Lake Näsnaren is situated in a Natura 2000 area.

This work consists of a survey and risk classification of eleven metal industries including foundries, finishers and engineering industries in two industrial areas in Mora. The study follows a method called MIFO (Method of Surveying Contaminated Sites) composed by the Swedish Environmental Protection Agency. In the method assessments of the degree of hazard posed by the pollutants, the level of pollution, the conditions of dispersal, sensitivity and the degree to which the area is worthy to protect are made for each contaminated site (object). The assessment classify the objects into four risk classes in which risk class 1 denotes a very large risk, 2 large risk, 3 moderate risk and risk class 4 little risk. The work of surveying using MIFO is divided into two phases.

Nordre älv är ett av två utflöden från Sveriges största vattendrag Göta älv. Estuariet som består av älvens mynning och en del av skärgården, är speciellt med blandning av sött och salt vatten och är utpekat till bland annat Natura 2000-område. I framtiden är det ett möjligt scenario att flytta delar av sjötrafiken som idag går i Göta älv genom Göteborg, till Nordre älv istället. Förutsättningarna för sjötrafiken genom Göteborg förändras i takt med att staden utvecklas och förväntade havsnivåhöjningar kan fordra större skyddsåtgärder för staden i framtiden. Här spelar både samhälls-, ekonomi- och miljöaspekter roll och en sammanvägning av konsekvenser behöver göras.

Stora volymer förorenade sediment kommer att behöva tas om hand under de kommande åren då bottensediment i svenska farleder, hamn- och kustområden under lång tid har konta?minerats av både tungmetaller och organiska föroreningar. I examensarbetet studeras fyra möjligheter för hantering av förorenade muddermassor. De tre traditionella metoderna är tippning till havs, utfyllnad i vik eller deponering på land. Stabilisering/solidifiering (s/s) är ytterligare ett alternativ som innebär att muddermassorna kan nyttiggöras i geokonstruktioner genom att massornas hållfasthet ökas.