On Wednesday June 4, members of the Technical Committee of the MDA of Ilo, visited the water treatment plant (WWTP) of Puente Piedra. We had a presentation by Ing º Zenobio Edgar Villanueva on the plant extended aeration activated sludge. Is an aerated process with recirculation of sludge that accelerate the development of microorganisms to remove contaminants. The sludge produced is separated in a secondary settler.
The Stone Bridge WWTP is an activated sludge process, extended aeration, opimize the SBR system (Sequency Batch Reactor: reactors) where aeration and sedimentation are carried out in one unit, in alternation.
The design of this plant is Danish, was built in 2002 and its volume is 420 l / s, BOD of 250 mg / l (Part of the polluting organic matter is measured in BOD: biochemical oxygen demand, which is the amount of oxygen absorbed by the biological oxidation of biodegradable organic components of a water sample), for a population (2007) of 250,000. Currently running at around 380 to 400 thousand inhabitants.
We have been operating in conflict flashpoints, its operating cost is 3 million soles per year, it is not used cost user fee. This plant requires upgrading as the design parameters are not being met: characterization of the water, land use, legislation that protects and set the parameters.
The primary recipients are farmers who do not pay anything. There
industrial waste textiles and slaughterhouses.
No treatment by-products: treatment of sludge. There is no drying bed digesters.
operating cost to bring the landfill 30 buckets of sludge / day is S /. 89, m3.
composting is not done and there is no market.
The energy index is 0.43 kW/m3.
operating staff is reduced: 4 people and the preventive maintenance of 3. The chlorination step is having problems.
The staff is sick, stomach and throat. Aerators produce odor and pollution.
Is not a laboratory.
next day (05/06/2008), the Civil Society members visited the plant wastewater treatment Carapongo (Nana) whose design flow is 500 l / s. After being treated is deposited in the river Rimac. The system is anaerobic-aerobic. The treatment of drains with anaerobic process is performed in the absence of oxygen. To improve the quality of effluent must be complemented with a process aerobic (use of aerators or diffusers).
The anaerobic system is fully covered to control emissions. You can use USAB reactors or anaerobic lagoons.
We see that the system works well, is the burden of Huaycán Chosica and yet have difficulty in operating costs of sludge management for transfer to the landfill.
We have to thank Eng º Francisco Quezada Neciosup the presentation and attention and suggestions received.
After the coordination carried out by Eng º Quesada could be made to visit the water treatment plant potable Atarjea, where we received the Ing º Raúl Zamudio, after our presentation and explain the reason for our visit, we will gladly showed us the different stages of the process from acquisition to final processing. We also went to the control room which monitors the entire process. A request to invite nuesro for diagnosis and recommendations for the treatment plant at Ilo, told us he would be willing to collaborate.
On behalf of the Technical Committee to thank those who made this trip and the people who graciously welcomed us.
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