Blar i NIVA-rapporter på forfatter "Ratnaweera, H. - Project manager"
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Chemical wastewater treatment: A concept for optimal dosing of coagulants
Ratnaweera, H. (NIVA-rapport;3713, Research report, 1997)A concept for optimisation of the coagulant dosing for domestic wastewater treatment is presented and evaluated. The concept is based on the real-time estimation of the optimal coagulant dosage using on on-line water quality ... -
Economic analysis of the value of water in alternative uses in the Lake Wuliangsuhai catchment, Inner Mongolia, China
Barton, D. (NIVA-rapport;5052, Research report, 2005)While Lake Wuliangsuhai is one of China’s largest freshwater lakes, its existence relies on the amount and quality of return flow from the Hetao irrigation area, in turn supplied from the Yellow River. The report estimates ... -
Establishment of aquaculture consultancy and analytical service in Chile - A pre-feasibility study
Ratnaweera, H.; Åtland, Å. (NIVA-rapport;5642, Research report, 2008)Chile is the world’s biggest salmon producer after Norway. The production efficiency is still far less in selected areas, and the impact of water qualityis one of the main reasons. NIVA has unique competence in providing ... -
Evaluation of coagulant/polymer combinations on VEAS wastewater
Ratnaweera, H.; Ødegaard, H. (NIVA-rapport;2726, Research report, 1992)Three coagulant/polymer combinations from two metal salts (M14, M31), two cationic polymers (A25, A27) and one anionic polymer (P6) are evaluated on VEAS wastewater for their flocculating, sedimentating and sludge ... -
Evaluation of polymers as coagulants for Olive oil industry wastewater
Ratnaweera, H. (NIVA-rapport;2739, Research report, 1992)Olive oil industry wastewater (Alpechine) samples are coagulated with a range of organic polymers with different chemical compositions, molecular weights and cationic natures. Nearly 100% particle removals are possible to ... -
Fuzzy kontroll i vannbehandling - Pilotforsøk
Ratnaweera, H.; Anderssen, E.; Seim, F.; Njål, E.; Nilsen, Niels K. (NIVA-rapport;3849, Research report, 1998)Erfaringer fra vannrenseanlegg med manuell styring av driftsparametre viser at det ofte oppstår problemer med driftsstabiliteten når råvannskvaliteten endres. Fuzzy logikk er en reguleringsmetode som kan håndtere slike ... -
Fuzzy kontroll i vannbehandling. Forprosjekt. (Fuzzy logic in water treatment: Pre-project)
Ratnaweera, H.; Olafsson, J.F. (NIVA-rapport;3393, Research report, 1996)Fokuseringen på kjemisk vannrensing vil bli økt med de nye vannforskriftene i Norge. Krav til prosesstabilitet, rensegrad, rest kjemikalier og økonomi vil øke med tiden. Sanntids prosesstyring vil være den eneste konkurrerbare ... -
Lake Wuliangsuhai Restoration Project - Final Report
Fejes, J.; Ratnaweera, H.; Yawei, L.; Lindblim, E.; Faafeng, B. (NIVA-rapport;5649, Research report, 2008) -
Lake Wuliangsuhai Restoration Project: Basic Processes of Lake Wuliangsuhai
Faafeng, B.; Qingfeng, L.; Shiyou, S.; Quanzhong, L.; Fejes, J.; Li, T.; Oredalen, T.; Løvik, J. (NIVA-rapport;5644, Research report, 2008) -
Lake Wuliangsuhai Restoration Project: Historical Development of Lake Wuliangsuhai
Faafeng, Bjørn; Shiyou, S.; Johansson, L.; Amsink, S.L.; Jensen, K.; Jeppesen, E.; Bradshaw, E.; Li, M.; Medboe, F.; Christiansen, A.; Ruden, F.; Oredalen, T.; Løvik, J. (NIVA-rapport;5645, Research report, 2008) -
Lake Wuliangsuhai Restoration Project: Management and Control Plan
Ratnaweera, H.; Fejes, J.; Yawei, L.; Lindblim, E.; Faafeng, B.; Ruden, F. (NIVA-rapport;5650, Research report, 2008) -
Lake Wuliangsuhai Restoration Project: Water Quality Monitoring System
Faafeng, B.; Li, M.; Lindblom, E.; Junfeng, Y.; Oredalen, T.; Løvik, J.; Svenson, A. (NIVA-rapport;5647, Research report, 2008) -
Produksjon av lavkvalitetskitosan fra rekeavfall og anvendelse i rensing av prosessavløp fra rekepillebedrift
Norgaard, E.; Liltved, H.; Skåra, T. (NIVA-rapport;3888, Research report, 1998)Prosjektet har fremskaffet en grunnresept for fremstilling av kitosan fra rekeskall. I prosjektperioden har fremstillingen delvis foregått i en 2-trinns ekstraksjonsprosess og delvis i en 3-trinns prosess. For å få et best ... -
Travel Report. A study on environmental technology projects and possibilities in Sri lanka and Bangladesh
Ratnaweera, H.; Aasgaard, G. (NIVA-rapport;3161, Research report, 1994)NIVA intends to increase its involvement in the south-east Asia. In addition to the advanced knowledge in environmental technology, this requires an understanding of the local conditions, procedures and a knowledge on ...