1. Examiner of Master Thesis: Appropriate Water Supply Management Considering the Israeli Invasions to the Gaza Strip, (2022). Researcher: Tamer M. Alnajjar, Master of infrastructure Engineering, Faculty of Engineering, Deanship of Research and Graduate Studies, The Islamic University of Gaza, Palestine.

2. Al Hindi, Adnan and Ahmed Hilles (2021): Health and Environmental Impact of Wastewater in the Gaza Strip: Evaluation of the Current Situation, Current Environmental Health Reports, Springer, 2021.

3. As Reviewer of the article: Performance of Combined Persulfate and Tannin for the Treatment Of Anaerobically Treated Palm Oil Mill Effluent. Muneer M. A. Ayasha, Salem S. Abu Amrb, Abbas F. M. Alkarkhic, Motasem Y.D. Alazaizad and Rami J. A. Hamade, Global NEST Journal, 9-2021.

4. Examiner of Master Thesis: Start-up Process in extended Aeration Activated Sludge system in semi-arid areas: Khan Younis Wastewater Treatment Plant as a case study, (2020). Researcher: Abed El-karim Ali Imara, Master of water treatment, Faculty of Engineering, Deanship of Research and Graduate Studies, The Islamic University of Gaza, Palestine.

5. Hilles Ahmed H., Salem S. Abu Amr, Abbas F.M. Alkarkhi & MD Sohrab Hossain, (2019):The Effect of Persulfate Oxidation on the Biodegradability of Concentrated Anaerobic Stabilized Leachate. Sains Malaysiana 48(11)(2019): 2381–2390
http://dx.doi.org/10.17576/jsm-2019-4811-09

6. Hilles, Ahmed H. (2019): Plastics in the Gaza Strip are Both a Curse and a Blessing, Report of the National Geographic, 8/2019.
https://www.nationalgeographic.com/environment/2019/08/gaza-strip-plastics/?fbclid=IwAR09tIaw9rCZwk2k8g8sVO0V-BRwYmb5w8MA5bsNRjDQLN-ZjY44-YRj3Lc

7. Hilles, Ahmed H. and Azzam A. Abuhabeb (2018). The Impact of Pollution in Wadi Gaza on the Palestinian Communities Surrounding the Wadi. The 9th Palestinian Environmental Awareness and Education conference: Promoting Environmental Action in Palestine (Mechanisms, Plans and decisions). Environmental Education Center, Evangelical Lutheran Church in Jordan and the Holy Land, Bethlehem, West Bank, Palestine, 11/2018.

8. Hilles, Ahmed H. (2017). Report of the Current Environmental and Water situation in Gaza Strip (Facts and Records 2017), Palestinian Environment Quality Authority (EQA), 5/2017.
https://www.researchgate.net/publication/317381942_Report_of_the_current_Environmental_and_Water_situation_in_Gaza_Strip_Facts_and_Records_2017

9. Hilles A.H. and Abu Amr S.S. (2016), Factorial design and optimization of leachate treatment using persulfate oxidation, Global NEST Journal, 18(4), 842-854. http://journal.gnest.org/sites/default/files/Submissions/gnest_02035/gnest_02035_proof.pdf

10. Hilles A.H. and Abu Amr S.S. (2016), The performance of persulfate oxidation for anaerobic satirized leachate treatment, Postgraduate symposium in green technology and engineering, Section of Environmental Engineering technology, Universiti kuala lumpur, Melaka, Malaysia.

11. Hilles, H. Ahmed, Abu Amr S. Salem, Hussein A. Rim, Arafa I. Anwar and El-Sebaie D. Olfat (2015). “Effect of persulfate and persulfate/H2O2 on biodegradability of an anaerobic stabilized landfill leachate”. Waste Management Journal: 44 (2015) 172–177, Elsevier Ltd./ Science Direct, (http://dx.doi.org/10.1016/j.wasman.2015.07.046).

12. Hilles, H. Ahmed, Abu Amr S. Salem, Hussein A. Rim, Arafa I. Anwar and El-Sebaie D. Olfat (2015). “Performance of combined sodium persulfate/H2O2 based advanced oxidation process in stabilized landfill leachate treatment”. Journal of Environmental Management, 166 (2016) 493-498, (http://dx.doi.org/10.1016/j.jenvman.2015.10.051).

13. Hilles, H. Ahmed (2015). “Using of solid waste leachate in irrigation in Gaza Strip, Effects on the environment and Public Health”. Journalistic Investigation, Conducted by Islam Alza’anon, Green Life Magazine, West Bank, Palestine. 4th Issue, Feb.
http://www.greenlife.ps/resources/file/newsletter/Green-life-magazine-4-2015.pdf

14. Hilles, H. Ahmed, Abu Amr S. Salem, Hussein A. Rim, Arafa I. Anwar and El-Sebaie D. Olfat (2015). “Optimization of leachate treatment using persulfate/H2O2 based advanced oxidation process: case study: Deir El-Balah Landfill Site, Gaza Strip, Palestine”. Water Science & Technology Journal, (DOI: 10.2166/wst.2015.468). http://wst.iwaponline.com/content/73/1/102

15. Hilles, H. Ahmed, Abu Amr S. Salem, Hussein A. Rim, Arafa I. Anwar and El-Sebaie D. Olfat (2015). “Removal of Recalcitrant Organic Contaminants and Ammonia from an Anaerobic Stabilized Leachate Using Na2S2O8”. Journal of Environmental Management.

16. Hilles, H. Ahmed as a supervisor, “Economic feasibility of gray wastewater reusing system by home-scale treatment unit, case study: Gaza Strip”. 2014. B.Sc. research, conducted by Sara K. Hillis, Afnan E. Ashour and Rania f. Almozaine. Development Planning department, University College of Applied Sciences, Gaza.

17. Hilles, H. Ahmed, Sarsour K Amal, Ramlawi K. Ayman and Abed Yehia, (2014). “Assessment of Sanitary Conditions in the Main Swimming Pools in Gaza Strip (2010–2013): Palestine”. International Journal of Scientific Research in Environmental Sciences, 2(8), pp. 261-268, 2014. online at: http://www.ijsrpub.com/uploads/papers/IJSRES/IJSRES-2014/Aug/IJSRES-14-44.pdf

18. Hilles, A. H.; Al Hindi A. I. and Abu Safieh Y. A. (2014). “Assessment of parasitic pollution in the coastal seawater of Gaza city”. Journal of Environmental Health Science and Engineering, 2014, 12 (1): 26. Licensee BioMed Central Ltd. doi: 10. 1186/2052-336X-12-26. http://www.ncbi.nlm.nih.gov/pmc/articles/PMC3924707/

19. Hilles, A. H.; Al Hindi A. I. and Abu Safieh Y. A. (2013). “Is Gaza Sandy Shoreline Region Contaminated with Human Gastrointestinal Parasites?”. Jordan Journal of Biological Sciences (JJBS), Volume 6, Number 3, September.ISSN1995-6673Pages205–210. http://jjbs.hu.edu.jo/files/v6n3/Paper%20Number%205m.pdf

20. Hilles, A. H. and Al-Najar H. (2011). “Brackish Water Desalination Is the Merely Potable Water Potential in the Gaza Strip: Prospective and Limitations”. Journal of Environmental Science and Technology, 4: 158-171, ISSN1994-7887/DOI:10.3923/jest.
http://scialert.net/abstract/?doi=jest.2011.158.171

21. Hilles, A. and Abu Amr S. (2011).”Statistical Analysis for Physico-chemical Characteristics in the Shoreline Region of Gaza City”. Journal of south Valley university for environmental researches (JSVUER), Published by the Center of Community Service and Environmental Affairs, South Valley University: Qena-Egypt, Vol (1) Number (1) July 2011. ISSN 2090-7206.

22. Hilles, A. and Abushbak T. (2011).”Society and Household Behavior, Culture and Attitudes & Their Role in Solid Waste Management”. Al Azhar University- Gaza, IWE. 3/2011.
https://www.researchgate.net/publication/249644381_Society_and_Household_Behavior_Culture_and_Attitudes_Their_Role_in_Solid_Waste_Management

23. Hilles, A. and Tubail K. (2011).” Wastewater in the USA & WWTP in the City of Norman, Oklahoma State”. Al Azhar University- Gaza, IWE. 2/2011.

24. Hilles, A. and Aish A. (2011). “Applications of WinSieve, WinLoG and WinFence Models in the Hydro-geological Studies as a Descriptive and Interpretative Softwares”. Al Azhar University- Gaza, IWE. 2/2011.

25. Hilles, A. and Aish A. (2011).” Hydro-chemical Analysis and Evaluation of Water Quality Using PLOTCHEM Model as a Water-Quality Data Plotting and Descriptive Software”. Al Azhar University- Gaza, IWE. 1/2011.

26. Hilles, A. and Aish A. (2011).”Evaluation of the Groundwater Aquifer and Pumping Test in the Northern Area of Gaza Strip Using Aquifer Test v3.0 Software”. Al Azhar University- Gaza, IWE. 1/2011.

27. Hilles, A. and Zain ElDeen U. (2011).”Remote Sensing Applications in Oceans and Coastal Studies”, Al Azhar University- Gaza, IWE. 12/2010.

28. Hilles, H. A.; Al Aklook S. and Al Desht J. (2010).”The Situation of Gaza Strip Coastal Aquifer & the Main Challenges”, (IWE, 4/2010).

29. Hilles, A. and Hamada M. (2010). “Geochemical Cycle of the Nitrogen Element in the Nature” (IWE, 1/2010).

30. Hilles, A and Abu Dayah M, (2009). “Seasonal Variation of the SST Obtained from In Situ Measurements and it’s Use to Evaluate the Satellite Data in Firth of Clyde in the Northeast Atlantic” (IWE, 12/2009).

31. Abu Mayla Y and Hilles A, (2009). “Assessment of Water Quality in Ground Water Aquifer of the Gaza Strip”, (conference /Egypt, March 2009).

32. Hilles, A; Arafat H and Abdo T, (2000). “Chemical and Biological Evaluation of the Domestic Water Filters Efficiency”, Gaza Strip, Islamic University of Gaza, Palestine.

33. Hilles, A. “Solid Waste Management in Gaza City”, IUG/Municipality of Gaza, Sep, 1999.

34. Hilles, A. “Geophysical Surveying Using Seismic Method”, CAMP Project, IUG- Gaza, 1998.