| | | ACWUA's first international conference on " cost recovery at water and wastewater utilities:achievements,challenges and solutions" | Jordan | 2010 | Participant | |
| | | international conference on Imar Gaza | Turkey | 2009 | Participant | |
| | Halalsheh,M,.Abu Ghunmi,L., Al-Alami,N,.Fayyad,M. | international IWA conference on new sanitation concepts and models of governance | Netherland | 2008 | Lecturer | |
| | | international conference on Sanitation challenge | Netherlands | 2008 | Participant | |
| | | Sustainable management of wastewater for agriculture production in water scarce countries | Syria | 2007 | Participant | |
| | | Regional EMWATER Coference on efficient management on wastewater treatment and reuse | Mediterranean countries | 2006 | Participant | |
| | Halalsheh,M.,Kassab,G.and Fayyad,M. | the international workshop on implementation of anaerobic sewage treatment in the middle east with focus on jordan and egypt:a low cost,low energy alternative workshop | Egypt | 2006 | Lecturer | |
| | Halalsheh,M.,Kassab,G.,Fayyad,M. | first international conference on sustainable urban wastewater treatment and reuse | Cyprus | 2005 | Lecturer | |
| | | First international conference on sustainable uraban wastewater treatment and reuse | Cyprus | 2005 | Participant | |
| | | Report prepared for the MEDITATE-EU | | 2005 | Others | |
| | Halalsheh,M.,Smit.T.,Kerstens,S.,Tissingh,J.,Zeeman,G.,Fayyad,M.Lettinga,G. | 10th Anaerobic digestion conference in montreal | Canada | 2004 | Lecturer | |
| | Halalsheh,M.,Kerstens,S.,Zeeman,G.,Van Lier,J.,Fayyad,M.Lettinga,G | 10th Anaerobic digestion conference in montreal | canada | 2004 | Others | |
| | Halalsheh,M.,Sawajneh,Z.,Salhi,A.,Omari,A.,Fayyad,M. | 10th worls congress on Anaerobic Digestion | Canada | 2004 | Lecturer | |
| | | Tenth anaerobic digestion congress | Canada | 2004 | Participant | |
| | | International symposium on low cost wastewater treatment and reuse | Cairo | 2001 | Participant | |
| | | International WIMEK congress | Netherland | 1998 | Participant | |