Managing Waste Water at Evergreen Wastewater Treatment Plant

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Evergreen Waste Water Treatment Plant (E.W.W.T.P) is situated on the outskirts of Port of Spain. Commissioned in 2004, E.W.W.T.P is the largest waste water treatment facility in the Caribbean region. It is owned by the Government of Trinidad and Tobago through Water and Sewerage Authority of Trinidad and Tobago (W.A.S.A). However, it is operated through the Mexican wastewater management firm Earth Tech. The 180 ML/d activated sludge plant serves the capital city of Port-Of- Spain and its environs (Mc Taggart et al, (2007)). Owing to the development of the capital city and its environs during the rainy season, the pump station becomes flooded regularly (Garcia, 2010). The excess wastewater puts a strain on the existing pumps located at the pumping station and as a result the untreated water is released into the sea. Both marine and human lives are affected by this action as it diminishes the ecosystem that exists on the coastline. According to Mc Taggart et al, (2007), the maximum amount of water the plant can withstand is 2000 L/s. However, for the month of November 2012, records revealed that it has exceeded the limit roughly five times. The graph below shows details of the amount of water at the pumping station for the month of November 2012.

Figure 1: Water at the Intake L/s. (Stewart, 2013)

Engineers at the plant have initially thought of adding another pump. However, H2O Solutions have been solicited to evaluate the feasibility of adding another pump against replacing the pumps with another type of a higher performance rating. Objective

The objective of the project will be to alleviate the flooding at the pumping station during the rainy season. Two situations will be analyzed. They are as follows: 1. Adding an additional pump to the system

2. Replacing the existing pumps with a one of a different type and size Scope
The project will be divided into the following stages:
1. Collection of data.
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