THE INFLUENCE OF COAGULANTS AND PRECIPITANTS ON THE BEHAVIOUR OF SEWAGE SLUDGE ON AGRICULTURAL LAND
During the waste water process, coagulants are used to remove phosphorus and BOD and to stabilise the process. The coagulants will accumulate in the sludge mainly as metal phosphates and a minor portion as metal hydroxides. These elements will influence the behaviour of the sludge when it is disposed of on agricultural land.The availability of […]
MODERN SBR TEKNIK 1 EUROPA – TIO ÅRS ERFARENHETER/ Modern SBR technology in Europe – a 10 year perspective
Biological nutriem removal by means of the SBR technology has become acknowledged also in Europe during the last few years, after its breakthrough in the US and Japan some 10 years ago.This paper presents the performance of three modern SBR plants in Europe, all operated for advanced removal of BOD, total N and P. The […]
PESTICIDE RESIDUES IN SELECTED DRINKING WATER SUPPLIES IN SWEDEN
In order to study the possible contamination of drinking water supplies with pesticides, the National Food Administration carried out an invesrigarion in 33 water supplies during 1992-94. Sampling was done both in surface and ground warer supplies. Pesticide residues were found in three ground water supplies on all seven occasions and in one surface water […]
ON WATER AND POTENTIAL WORK
Many attempts have been made and are under investigarion in order to create artificial-life. Farfetched experiments have been piloted based on classical electro-mechanical and dynamical iheories. Yet none have revealed any sign of life emerging from lifeless matter. On the contrary, life through the interference of water always evolve from life.By interweaving known theories a […]
SOME ADVANTAGES OF STUDYING LIVING PHYTOPLANKTON
Many phytoplankton species are notoriously motile, fragile, difficult to preserve, and difficult to identify in preserved samples. Microscopical examinadon ofliving phytoplankton material has several advamages, though it often demands great patience. Species identification is easier and it is possible to observe e.g. life cycle, pigmentation, motility, particle uptake and some food web relationships. Rare, fragile […]
LOKAL AGENDA 21 – EN UTMANING FÖR VA-SEKTORN / Agenda 21 – A Challenge for the Water Supply and Sanitation Sector
To create a Local Agenda 21-process, is a very challenging task, which requires knowledge, political will, and political clout. The experience that we hitherto have in Sweden, shows the importance of commitment to the work, within as well the political as the administrarive leadership in the municipalky. Water is, in many ways, an inregrating factor […]
INFLUENCE OF SUPPORT MEDIA IN ANAEROBIC FIXED-FILM BIOLOGICAL PROCESSES
Anaerobic fixed-film biological processes for wastewater treatment have been used for many years. Still, the influence of the support medium is not fully understood and contradictory statements are often found in the literature. The reason for this is the complexity and variation of the organic material normally found in the wastewater to be treated and […]
ANALYS AV VFA – EN ENKEL TITRERMETOD / Analysis of VFA – A Simple Titration Procedure
A decisive factor in the operation of an enhanced biological phosphorus removal (EBPR) process is th availability of readily biodegradable organics in the influent. Especially important is the amount of volatile fatty acids, VFA. At the WWTP in Helsingborg, Öresundsverket, full-scale EBPR-tests in two of the four trains are running. Hydrolysis of primary sludge in […]
AN EVALUATION OF COST EFFICIENCYAND SUSTAINABILITY OF DIFFERENT WASTEWATER TREATMENT PROCESSES
In order to be able to determine wheiher or not a wastewarer treatment method is the best one in a given case, it would be beneficial if the treatment method could be evaluated both with respect to cost efficiency (cost in relation to receiving water improvemenr) as well as sustainability (consumption ofraw materials and energy). […]
FÖRFÄLLNING AV HUMUSRIKA YTVATTEN – APPLICERAD SLUTNING TILLVATTENVERKETS RÅVATTENINTAG / Pre-Treatment of Humus Contaminated River Waters – Applied at the Intake of Water Works
This paper presents a new technology for the treatment of humus contaminated river warers, using ferri/flocculation and floating sedimentarions tanks, insralled in a lakewater body, connected to ihe main water resevoire of the Vaasa potable water works, in Finland. The capacity ofthis plant is 1 000 m3/h. It started in the summar 1995. Vaasa water […]