Blar i NIVA Open Access Archive på forfatter "Ratnaweera, H."
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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 ... -
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 ... -
Forsøk med lagring av levende europeisk flatøsters (Ostrea edulis)
Bomo, A.-M.; Braaten, B.; Ratnaweera, H.; Skogesal, G.; Stevik, T.K.; Robberstad, S. (NIVA-rapport;3693, Research report, 1997)I dette prosjektet er det utført forsøk med lagring av levende europeisk flatøsters (Ostrea edulis) i åpne anlegg (gjennomstrømningstanker) og lukkede anlegg (100% resirkuleringstanker). Tetthet og skjellenes plassering ... -
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 ... -
Integrated Management of Industrial and Municipal Wastewater in China. - Demonstration Project in Jiaxing, Zhejiang Province
Mohn, H.; Medbø, F.; Ratnaweera, H.; Borgvang, S.; Nordeidet, B.; Lindholm, G.J.; Ping, Song He; Yumei, Shen (NIVA-rapport;4269, Research report, 2000)The city of Jiaxing in Zhejiang Province is a medium-size, rapidly expanding Chinese city located in a flat landscape with numerous canals. These are used for navigation, fishing, aquaculture and as drinking and industrial ... -
Integrated Management of Industrial and Municipal Wastewater in China. - Demonstration Project in Jiaxing, Zhejiang Province Executive Summary, Part 1 of Final Report
Mohn, H.; Medbø, F.; Ratnaweera, H.; Borgvang, S.; Nordeidet, B.; Lindholm, G. (NIVA-rapport;4259, Research report, 2000)The city of Jiaxing in Zhejiang Province in a medium-size, rapidly expanding Chinese city located in a flat landcape with numerous canals. These are used for navigation, fishing, aquaculture and as drinking water source, ... -
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: Management and Control Plan
Ratnaweera, H.; Fejes, J.; Yawei, L.; Lindblim, E.; Faafeng, B.; Ruden, F. (NIVA-rapport;5650, Research report, 2008) -
RADIBIO. Degradation of recalcitrant chlorinated organics by combination of radiochemical and biochemical oxydation
Berge, D.; Efraimsen, H.; Ratnaweera, H. (NIVA-rapport;2781, Research report, 1992)The method have been tested for degrading chlorogranics (AOX) in kraft bleach effluents with a removal efficiency of aproximately 75%. With optimization, a theoretical outline indicates that is should be possible to remove ... -
Renseanlegg og system for avløp. Integrert modellering og beregning av totalutslipp
Lindholm, G.J.; Nordeidet, B.; Ratnaweera, H.; Aasgaard, G. (NIVA-rapport;4113, Research report, 1999)Kommunene har de senere år fått større ansvar for å fastsette mål for vannforekomster og å fremlegge dokumentasjon av utslipp. På den annen side har de fått større frihet til å velge tekniske løsninger som er tilpasset ... -
Travel report A study of the potential for collaboration on water-related environmental projects in Sri Lanka I: Coastal aquaculture and zoning plans, II: Environmental education, III: Other projects
Braaten, B.; Lyche, A.; Ratnaweera, H.; Sørensen, J. (NIVA-rapport;3335, Research report, 1995)This travel report presents a summary of meetings held in Sri Lanka 25/9-6/10/95 between Sri Lankan authorities and institutions, NORAD and NIVA. The objective of the mission was: (1) to discuss the implementation plan for ... -
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 ... -
Water Pollution abatement programme, The Czech republic Pollution abatement analysis and strengthening of water resources management, Odra River Catchment, phase II
Dagestad, K.; Ratnaweera, H.; Ibrekk, H.O.; Hansen, J.H.; Tridlica, L.; Brezina, P.; Skacel, A. (NIVA-rapport;3307, Research report, 1995)Odra river is extremely polluted by organic matter, nitrates, ammonia, phosphorus, bacteria, particles, heavy metals and other micro pollutants from municipalities, industries and agriculture. The poor water quality severely ...