Comparison of some physical and chemical pre-treatment methods for excess sludgeMenert, Anne; Blonskaja, Viktoria; Vaalu, Tarmo; Sokk, Olev; Mölder, Heino9th World Congress Anaerobic Digestion 2001 : September 2-6, 2001, Antverpen, Belgium : proceedings. Part 12001 / p. 61-66 : ill

Enhancement of methane productivity of anaerobic reactors of wastewater treatment plantsKuusik, Aare; Loigu, Enn; Sokk, Olev; Kuusik, ArgoWorld Acedemy of Science, Engineering and Technology : International Science Index2012 / p. 1296-1298

Excess sludge anaerobic treatment linked together with production of suspension fertilizersSokk, Olev; Kuusik, Rein, keemik; Loigu, EnnLibro de resumenes : IX Taller y Simposio Latinoamericano de Digestion Anaerobia : Isla de Pascua, Chile, 19-23 Octubre 20082008 / p. 78

Excess sludge anaerobic treatment linked together with production of suspension fertilizersSokk, Olev; Kuusik, Rein, keemik; Loigu, EnnMemorias : IX Taller y Simposio Latinoamericano de Digestion Anaerobia : Isla de Pascua, Chile, 19-23 Octubre 20082008 / p. 396-400 : ill

Generalised intergation of solid waste treatment practices to enhance methane productivity, generate suspension fertiliser and upgrade biogasKuusik, Argo; Kuusik, Aare; Pachel, Karin; Loigu, Enn; Sokk, OlevEuropean scientific journal2013 / p. 14-30 : ill

Impletation of sludge treatment directives and utilation of sludge in EstoniaRaia, Tiiu; Sokk, OlevWorkshop proceedings : Problems around Sludge - the Assession Countries Perspectives : Ispra, Italy, 20042004 / p. 28-30

Integration of technologies : biogas production, fertilizer production and biogas upgradingSokk, Olev; Loigu, Enn; Kuusik, Rein, keemik; Menert, Anne12th World Congress on Anaerobic Digestion : October 31st - November 4th, 2010, Guadalajara, Jalisco, Mexico2010 / [6] p : ill

Integration of technologies : biogas production, fertilizer production and biogas upgradingSokk, Olev; Loigu, Enn; Kuusik, Rein, keemik; Menert, Anne12th World Congress on Anaerobic Digestion : October 31st - November 4th, 2010, Guadalajara, Jalisco, Mexico2010 / p. 179

Investigation of anaerobic treatment of extremely high concentrated waste in the cheese industryBlonskaja, Viktoria; Mölder, Heino; Sokk, Olev; Vaalu, TarmoHELECO '99 : Environmental Technology for the 21st Century : 3rd international exhibition & conference : 3-6 June 1999, Thessaloniki, Greece : conference proceedings. Vol. 11999 / p. 57-62: ill

Investigation of anaerobic treatment of extremely high concentrated waste in the cheese industryMölder, Heino; Blonskaja, Viktoria; Sokk, OlevProceeding of the Fourth International Symposium on Waste Management : Problems in Agro-Industries, Istanbul, Turkey, 19981998 / [8] p

Lämmastiku- ja fosforiärastus reovee aktiivmudapuhastusesMölder, Heino; Sokk, OlevKeskkonnatehnika2002 / 2, lk. 16

Possibility of enhancing methane productivity in anaerobic reactors in the treatment of excess sludge from wastewater treatment plantsKuusik, Argo; Loigu, Enn; Kuusik, Aare; Sokk, OlevInternational journal of science and engineering investigations2013 / p. 33-36

Predicting preferable substrate blends for the production of biogasKuusik, Argo; Kuusik, Aare; Loigu, Enn; Sokk, OlevRecent advances in environmental science : [proceedings of the EESD'13, WWAI'13, NAHA'13, CGB'13, GEO'13, FIAAC'13] : Lemesos, Cyprus, March 21-23, 20132013 / p. 192-197 : ill

Reoveepuhasti operaatori õpikSokk, Olev2009 https://www.ester.ee/record=b2508517*est

Reoveepuhastioperaatorite kursuse läbitegemine võimaldab taotleda veetöötlusoperaatori II kutsetMölder, Heino; Sokk, OlevKeskkonnatehnika2001 / 4, lk. 9

Reoveepuhastioperaatorite täiendkoolitus [TTÜ juures]Mölder, Heino; Sokk, OlevKeskkonnatehnika1999 / 1, lk. 10-12

Selection of most promising substrates for biogas productionKuusik, Argo; Kuusik, Aare; Loigu, Enn; Sokk, Olev; Pachel, KarinInternational journal of energy and environment2013 / p. 115-124 : ill

Sewage sludge management and its possible trends in Estonia [Electronic resource]Kuusik, Aare; Sokk, OlevTechnology 2005 : 2nd Joint Specialty Conference for Sustainable Management of Water Quality Systems for the 21st Century : Working to Protect Public Health : August 28-31, 2005, San Francisco, California, USA2005 / p. 962-?

Sewage sludge management and its trends for EstoniaKuusik, Argo; Sokk, OlevEWA Conference : Nutrient Management : European Experiences and Perspectives2004 / p. 131-138

Suspension fertilizer from excess sludgeSokk, Olev; Goljandin, DmitriFacing Sludge Diversities : Challenges, Risks and Opportunities : Antalaya, Turkey, 28-30 March 2007 : proceedings2007 / p. 971-974

Thermophilic treatment of organic wastes - an efficient technology for environmental risk reductionKurissoo, Tõnu; Rebane, J.; Sokk, OlevJoint Conference of Scandinavian Society of Cell Toxicology and Estonian Society of Toxicology : (SSCT & ETS 98) : Tallinn, October 23-26, 1998 : program and abstracts1998 / l. 74