The Swedish urban water systems have been in use and under continuous development for more than a century. The urban water systems of today fulfil to a high degree basic requiremenrs concerning safety, hygiene and protection of the environmeni. For the past years, however, the systems have been criticised from the viewpoint of sustainability. The […]
Publiceringsdatum
Författare
PER-ARNE MALMQVIST
Nyckelord (Keyword)
water, waste water, storm water, sustainable, management
Nummer
1
Årgång
55
Utgåva
Wetland creation costs and their determinants are studied by an analysis of detailed dara on wedand creation programmes for causing nitrogen reducdon in two drainage basins in the agricultural district of SW Scania, southernmost Sweden. Estimated cost equations illustrate the importance of excavarion efforts for obtaining good predicrions of creation costs. An analysis of the […]
Publiceringsdatum
Författare
TORE SODERQVIST
Nyckelord (Keyword)
wetlands, nkrogen sinks, costs
Nummer
1
Årgång
55
Utgåva
LÄCKSÖKNING PÅ SJÖLEDNING I BORÅS / Leakage detection on a pressure main situated in a lake in Borås
Pressure recordings during transient conditions can be utilized for leak detection purposes on single pipes. This method has been described in a research project report CVA-Forsk, 1997) by the authors. In this case study a pressure main, situated in a lake and subjected to a leak, was examined by using pressure recordings. Two possible leak […]
Publiceringsdatum
Författare
LENNART JÖNSSON och ANDERS SVENSSON
Nyckelord (Keyword)
pipeline, leak detection, hydraulic transients, case study
Nummer
1
Årgång
55
Utgåva
Expansion for nitrogen reduction on Kalmar wastewater Treatment Plant (KARV) was realized with 2 sequencing batch reactors (SBR) for separate treatment of filtrate water. Online measuring instrumems were installed to make control of the SBR-process easier. The waterlevel and DO-meters are used for automatic operation control, whereas information on sludge content, pH, redox-pontential, ammonium and […]
Publiceringsdatum
Författare
REGINE HAKER
Nyckelord (Keyword)
SBR, seperate irearment offilirate water, online measuring instruments, monitoring
Nummer
1
Årgång
55
Utgåva
Models and modeling require management of the inherent complexity. Simplicity in models and modeling is a positive characteristic. Models and modeling possess no intrinsic value. Their value may be assessed only relative to an objective or a problem to be solved.
Publiceringsdatum
Författare
MAGNUS LIEDHOLM
Nyckelord (Keyword)
model, complexity, sirnplicity, intrinsic value
Nummer
1
Årgång
55
Utgåva
Mesophilic and thermophilic digestion of primary and activated sludge was investigated in lab scale reactors. Mixed primary and activated sludge was digested in one experiment and activated sludge was digesred alone in another. The same gas yield, COD and dry solids reducrion was obtained with both mesophilic and thermophilic digestion. However, more dissolved COD was […]
Publiceringsdatum
Författare
JOHN SORENSEN, GUNNAR THOLSTRUP and KJAER ANDREASEN
Nyckelord (Keyword)
mesophilic and thermophilic digestion, thermal hydrolysis, gas producdon, COD and sludge reduction, filterability of sludge
Nummer
1
Årgång
55
Utgåva