A FRAME WORKIntan Madya RatnaMaster-DD Program of CIVIL ENGINEERINGApplication of GIS in Wastewater Treatment Plant Siting in Urban Area(Aplikasi GIS Dalam Penentuan Lokasi Pengolahan Air Limbah Perkotaan)

RESEARCH TOPICSite Suitability Analysis for a Central Wastewater Treatment Plant(S) In Metropolitan Area Using Geographic Information System

WASTEWATERWastewater, is any water that has been adversely affected in quality by anthropogenic influence. Wastewater can originate from a combination of domestic, industrial, commercial or agricultural activities, surface runoff or storm water, and from sewer inflow or infiltration

-WIKIPEDIA-

WASTEWATER TREATMENT PLANTWastewater treatment plant is a place to process /convertwastewater- which is water no longer needed or suitable for its most recent use - into an effluent that can be either returned to thewater cyclewith minimalenvironmental issues or reused-WIKIPEDIA-

Geographic Information System (GIS)Ageographic information system(GIS) is a system designed to capture, store, manipulate, analyze, manage, and present all types of spatial or geographical data.

G.O.A.L.S

The study was to help solve the problem of siting wastewater treatment plants in Urban Area

INTRODUCTIONThis study will presents the use of Geographic Information Systems (GIS) in selecting suitable sites for the construction of a central wastewater treatment plant(s)For this purpose, several variables were analyzed using GIS technology.This method present here, can also be used in checking the suitability of selected sites or new areas for the purpose of constructing wastewater treatment plants.

A Suitable LocationWhat is that ???Suitable Location for water treatment plant, is a location that :Is not likely to pose any health threat to the environment as well as the people.Large enough for locating central wastewater treatment plant(s).AccessibleNo negative aesthetic effect to the cityGain the support of the people

Key POINT :Metropolitan area has high population of peoplePeople activity in metropolitan area raise more number of wastewater than in other areaMost of metropolitan area lacks in water treatment plant due to limited land

Objectives/SasaranThe study also considered the following sub objectives :

Ascertain the factors that are considered in selecting a site.Determine what would be the best site(s) based on multi-criteria decision making algorithm Examine the attitude, knowledge and perceptions of residents on wastewater treatment plants

METHODOLOGYthe application of GIS (multi-criteria decision making) in modelling these factors in order to arrive at locations that are suitable for locating wastewater treatment plants.

RESULTThe result is a composite map, which highlights the areas that satisfy all suitability criteria.

DATA REQUIRED:slope, land cover, distance to existing major roads, distance to rivers and lagoon, distance to existing major populated communities and distance to airport facilities.

Flow Chart Diagrams

Step-by-Step

S l o p eMild slopes would result in, higher hydraulic residence times and thus higher pollutant removal capacity.To minimize pumping costs and improve the overall efficiency of the wastewater treatment plant a maximum slope value of 10% was considered based on officials guidelines.

Digital Elevation Model

Slope Grid Of The Study Area (Classify)

Selected Areas In Terms Of Slope Less Than 10%(GENERALIZATION)

A 2000-m buffer around existing populated areas

3000-m Buffer Around Airport in AMA

Land Cover Map

Selecting Area Based on Land Cover Map

A 90-m river, 300-m lagoon Buffer Zone

A 300-m Road Buffer Zone

OVERLAYHaving examined all the different variables in the study area and maps created for each based on criteria identified,

The final analysis was carried out using the overlay function in ArcMap provided by the ArcGIS program.

The result is showing the areas that meet all the previously specified criteria and are suitable for the construction of a central wastewater treatment plant in certain Metropolitan Area.

Selected Areas for Central Wastewater Treatment Plant

R E S U L TAny final decision at the sub-metro level should be based on more detailed examination on each selected sites, involving a ranking of all possible sites using non-exclusionary criteria.The opinion of the people in the local communities should be taken into consideration in making the final decision to use any site for the construction of the treatment plant. Education of the local people is also very vital as it informs them on the essence of the installation of the treatment plants and how they would have to handle them.