Wastewater

Wastewater

Water

Wastewater

Presently AIT is facing the problem with lack detailed data of pipeline and sewage system due to floods in 2011. Detailed pipeline network including the details dimensions, date of installation and material will be drawn using the CAD software’s and mapped with Geographic Information System (ArcGIS). Similarly sewage mapping also will be done including location of pits, diameter of the pipe, location of pumps and flow path.

Our Goal

1. Water and wastewater audit for year 2013 – 2014
2. Comparative analysis of water and wastewater audit with previous documented years.
3. Pilot scale studies on potential reuse and recovery systems that can be used as a demonstration project.
4. Implementing policy level changes to improve the situation on the campus in terms of water and wastewater reuse.

Our Progress

  •  Baseline water and wastewater audit for the year 2013-2014
  • Comparative analysis of water and wastewater audit with previous documented years (2002, 2003, 2004, and 2005), and estimated registered population in campus for the year 2013

water consumption_22042015

Water consumption and estimate population by year

  • Identified the intensive area for whole campus and each categories (i.e. Computer Science and Information management, AIT golf club).

Intensive area_22042015

Intensive area (CS and Golf club)

Mapping of Pipeline and Sewage Line

Presently AIT is facing the problem with lack detailed data of pipeline and sewage system of
due to floods in 2011. Detailed pipeline network including the details dimensions, date of installation and material will be drawn using the CAD software’s and mapped with Geographic Information System (ArcGIS). Similarly sewage mapping also will be done including location of pits, diameter of the pipe, location of pumps and flow path.

Proposed Pilot Scale Study

Pilot scale study is being currently designed to be conducted in an academic building, student village and residential building. New dual flush water closets will be installed by replacing the current conventional water closets which consumes nearly 12-15 L/flush. New dual flush water closets consume only 5-6 L/flush. Similarly installation of faucet aerators will reduce the flow rate.

First, water meter will be installed bypassing the pipeline segment where the study is going to be conducted. Water meter readings will be recorded in daily basis and monthly basis for two months with the current conventional sanitary appliances. After two months new water conservation appliances will be installed and water consumption pattern will be recorded similarly as mentioned above. Amount of saved water will be calculated by comparing the water consumption from conventional method and new method. Pilot scale study will be conducted from 15th September 2014 to 15th April 2015.

Water and Wastewater Audit

Water and Wastewater Audit_22042015

Water Consumption of Different Building Sectors

Laboratory Tests for Water and Wastewater

Laboratory tests will be conducted for drinking water receiving from Pathumthani municipality, wastewater collected by AIT wastewater treatment plant and AIT pond water. Drinking water samples will be collected randomly from the drinking water fountains placed in every buildings and student village areas. Test will ensure the quality of drinking water in AIT and change in chemical characteristics from Pathumthani municipality to AIT.  Treated wastewater samples will be collected from AIT wastewater treatment plant. The tested result will ensure the reliability of the monthly report provided by Ranhill to AIT. Characteristics of the effluent of treated wastewater will assist to design wastewater reuse policy. This study will focus on reusing treated wastewater for AIT’s agricultural purposes and circulating in the AIT pond for overall water conservation.

Repairs and Maintenance

Visible leakages were repaired and corroded pipes were replaced during the research period and it will be continued throughout the research period. Problem in the AIT pond also investigated and solution will be suggested during the research period.

Replacing PVC_22042015

Replacing corroded steel pipe to PVC pipes

repairing water pipe_22042015

Repairing visible water pipe leakages near SV4 and resident – 39

Aeration of AIT ponds

During the second weekend of July 2014 some dead fishes were noticed in the pond. The amount of died fishes were increased in in the following days. It happened suddenly after the rainy season started. It is reported that almost 90% of the fishes were dead in the pond.  It drives AIT to find the reason for the tragedy happened.

Formally AIT pond is designed as a rainwater detention pond. During the rainy season pond will be filled up with rain water. Due to surface runoff, the sludge accumulation in the pond increases. It is obvious that solid particles and fallen leaves from the nearby trees will be washed off to the pond during the runoff. Increment of sludge accumulation; leads to reduction of retained water volume in the pond.  Reduction of water volume in the pond directly affects the eco system in the pond. The pond needs to be configured such that system of hydraulic efficiency is optimized, healthy vegetation is sustained and balance of the eco-system is maintained.

The pond was aerated through air tubes and aerators. Excessive growth of algae also could be a reason for decrement of DO. Sludge accumulation decreases the volume of water in the pond.  Excessive sludge in the pond could create a possibility of anaerobic condition. Anaerobic condition will lead to CH4, CO2 gas production. It will reduce the quality of water. Increase of nutrients will lead more algal growth.

The pond was divided into two parts by constructing a temporary dam. The water in a side was pumped out and accumulated sludge also removed. It was found there was no panitration is taking place to the pond from outside sources. This process will be done in the other part of the pond as well. It is important to check that if there is any penetration of the sewage water to the pond. It is reported by OAFM Escherichia coli bacterial effect was found in the pond water.

Aeration_22042015

Identification of Sewage Water Problem

Flowing water entirely disturbs the surrounding environment and creates odor too. It clearly indicates that it is sewage water.  Block in the sewage line, which is connected to the pits in the surrounding area of SU snack bar and filled sewage pits is causing the problem.

Sewage Water Problem_22042015

 

Pipe repair and pumping out the sewage water from the filled pit

Conducting sewage line maintenance on a regular basis will give a long term solution for this problem.