Engr. Arellano has dedicated his more than 40 years of his professional career to sustaining economic growth with concerns on the environment and advocacy for the preservation and conservation of Philippines’ natural resources.
He has made a mark in the water industry; planning and designing waterworks and sewerage systems for Metro Manila, conducting research on low cost sewerage and sanitation, water and wastewater treatment; sludge management, biogas from waste, water quality modelling, air pollution and noise control, solid waste management and privatization of the water and sewerage services.
Engr. Arellano joined the Maynilad Water Services Inc. in 1997 as Assistant Vice President and Head of the Engineering Area where he headed a USAID-IEMP project which helped set up environmental management systems for small and medium scale industries.
In 2006 he headed the team which, in collaboration with the Department of Health (DOH) and the World Health Organization (WHO), drafted the first water safety plan (WSP) for Maynilad Water Services, Inc. The DOH requested Maynilad for the use of this water safety plan as template for the water Districts in the Philippines.
Engr. Arellano also served as the program director for the WHO, DOH and Philippines Waterworks Association training for the drafting of WSPs in water districts in the Philippines.
He headed the team which conducted 20 WSP training events for more than 200 water districts. In 2014, in collaboration with the Asian Development Bank, he formulated the first Sanitation Safety Plan (SSP) for septage and sewerage systems in the Philippines.