Proceso de Potabilización del Agua.

Overview of Social and Citizen Education in Water Management

Introduction to Educational Initiatives

• The focus is on social and citizen education aimed at training individuals in the intelligent use of potable water and sanitation.

• Activities include workshops, talks, and tours of the La Dura water treatment plant, promoting environmental conservation, especially regarding water resources.

Student Involvement in Community Service

• Fourth-year high school students can fulfill 60 hours of community service through these educational activities.

• The initiative aims to reach those who have not participated in physical tours by providing detailed explanations about the water treatment process.

Understanding the Water Treatment Process

Journey from Source to Treatment Plant

• The presentation includes a virtual tour from the Taveras Dam to the La Dura treatment plant, part of the Central Cevo Aqueduct project inaugurated in May 1994.

• Key components include an electric generation station at Bao and a pumping station at Lope Angostura that supply water to various municipalities.

Water Collection and Initial Processing

• Rainwater collects in lakes and rivers before reaching Taveras Dam, which feeds local aqueduct systems.

• Raw water travels through large pipes (72 inches from Taveras; 42 inches from Noriega), arriving at La Dura for treatment.

Treatment Steps for Potable Water

Addressing Contaminants

• Raw water contains sediments and microorganisms that require purification before it is safe for human consumption.

• The first step involves removing turbidity—particles suspended in water—which can increase during heavy rainfall.

Chemical Treatment Process

• Aluminum sulfate is used as a coagulant to eliminate turbidity; this chemical is imported from countries like Colombia and Jamaica due to its costliness.

• Operators dissolve aluminum sulfate into a solution before applying it to raw water entering the treatment facility.

Coagulation Process Explained

Mixing Techniques

• After dilution, aluminum sulfate is dosed into raw water during rapid mixing phases where turbulence helps integrate chemicals effectively.

Water Treatment Process Overview

Initial Water Treatment Steps

• The process begins with raw water entering through a 42-inch pipeline, where it undergoes rapid mixing and coagulation. This is the first step in water treatment.

• Sulfate is introduced at the point of maximum turbulence to effectively mix with the raw water, which has a turbidity level due to particles present.

• The purpose of sulfate is to collect turbidity particles; this initial mixing phase lasts approximately 35 to 50 seconds.

Flocculation Phase

• The second stage of treatment is flocculation, occurring in a unit called a flocculator. Here, sulfate is applied while reducing the water's velocity using plates that create zigzag flow patterns.

• As the water slows down, sulfate mixes with turbidity particles, allowing for their removal as flocs begin to form.

Sedimentation Process

• Following flocculation, the next step is sedimentation. In this phase, water is allowed to rest so that formed flocs can settle at the bottom due to increased weight from combined particles.

• The settled flocs resemble small clumps and are collected through tubes designed for this purpose. Clean water rises above these settled impurities.

Filtration Stage

• After sedimentation, the clean water moves into filtration units containing sand layers (approximately 1 meter thick), which capture any remaining particles that passed through earlier processes.

• Water flows downward through these filters; any residual impurities are trapped in the sand layer before moving on to further stages of treatment.

Final Stages: Disinfection and Monitoring

• Once filtered, water enters a channel designated for filtered water before proceeding to disinfection—ensuring all microorganisms are eliminated post-treatment.

• If filters become clogged during operation, operators monitor specific indicators (like overflow lines), prompting necessary maintenance such as backwashing filters for cleaning purposes.

Water Treatment Process Overview

Chlorine Usage in Water Treatment

• Chlorine gas is utilized as a universal disinfectant in water treatment, similar to how sulfate is used to remove impurities from water.

• Ángel Pérez, the technician responsible for chlorine management, oversees the installation and monitoring of chlorine cylinders.

• The chlorine gas is mixed with water through a vacuum system before entering the clear water cistern for treatment; this area poses significant safety risks due to the toxicity of chlorine gas.

Safety Measures and Concentration Levels

• The concentration of chlorine used in treatment is 99.5%, compared to household products that typically range from 8% to 12%.

• Operators are equipped with autonomous breathing apparatuses and oxygen tanks for protection against potential leaks during handling.

Final Treatment Process

• The final stage involves two interconnected cisterns that hold approximately one million gallons of treated water, ensuring proper contact time with chlorine for effective disinfection.

• Water flows through a large pipe into these cisterns where it mixes with chlorine; international standards dictate a minimum contact time of 15 minutes to eliminate microorganisms.

Monitoring and Testing Chlorine Levels

• Regular checks on chlorine concentration ensure that treated water meets safety standards before reaching consumers, aiming for levels between 0.2 and 0.8 parts per million (ppm).

• Ángel Pérez uses ortotolidine as a reagent to test free chlorine levels in samples, comparing results against established standards.

Importance of Residual Chlorine

• Maintaining residual chlorine ensures any potential contamination post-treatment can be addressed effectively; other disinfection methods may not provide this residual effect.

• While alternatives like UV light exist for disinfection, they do not leave residual protection against future contamination unlike chlorination.

Compliance with International Standards

• The facility treats approximately 25.8 million gallons daily while adhering to international guidelines regarding aesthetic quality and safety parameters such as turbidity and residual chlorine levels.

Water Quality Monitoring and Treatment in Moca

Standards for Water Quality

• The acceptable levels of chloride and magnesium in water should be below 500 mg per liter, as per Pan American Health Organization standards.

• Total coliform and thermotolerant coliform contamination must be less than 2.2 mg per liter to meet health regulations.

Laboratory Procedures

• Continuous monitoring of water quality is conducted from the treatment plant to users' homes, ensuring safe drinking water for the population of Moca.

• The laboratory at the treatment plant conducts thorough analyses on treated water samples before they reach consumers.

Bacteriological Analysis

• Bacteriological tests are performed using a multiple-tube method, where samples are incubated to check for contamination over a period of 48 hours.

• If fecal coliforms are detected, further analysis is done to quantify contamination levels based on tube results.

Physical and Chemical Testing

• Turbidity measurements must remain below 5 NTU (Nephelometric Turbidity Units), which is essential for meeting international standards.

• pH levels should range between 6.5 and 8.5; hardness must be between 50 ppm and 500 ppm to ensure potability.

Importance of Chlorine Residual

• Maintaining chlorine residual levels between 0.2 and 0.8 is crucial for preventing microbial growth in treated water.

Community Engagement and Awareness

• Emphasis on responsible water usage was highlighted, urging citizens to conserve water due to its importance in public health.

Cost of Water Treatment and Community Awareness

Economic Impact of Water Treatment

• The cost of chlorine gas for water treatment is approximately 113,000 pesos, which lasts only six days. This highlights the financial burden associated with maintaining water quality.

• Daily expenses for treating turbid water exceed 200,000 pesos when turbidity levels are above five NTU (Nephelometric Turbidity Units), emphasizing the high operational costs involved in ensuring safe drinking water.

Community Responsibility and Education

• The speaker urges the community to collaborate by conserving water and using it rationally, stressing that clean water is a vital resource that requires collective effort to manage effectively.

• A call to action is made for social groups and students to disseminate knowledge about the importance of water conservation, indicating an educational initiative aimed at raising awareness within the community.