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Waste treatment can control bad health problems related to sewage.
Many municipalities have sewer systems in which wastes are collected, treated in a sewage plant, and then discharged back into the ecosystem. Other municipalities require households to treat their wastes individually, in private waste disposal systems.
Private waste disposal systems are designed to meet the needs of individual households and the requirement of applicable codes and health departments.
As in municipal waste treatment systems, but on a much smaller scale, the waste flows into a holding tank, where the sludge settles out and is digested by bacteria. Liquid waste flows through a distribution box into a leach field, where its seeps into earth in a natural purification cycle.
Plumbers must know about the different types of private disposal systems and the advantages and disadvantages of each.
Plumbers must also be able to install private waste disposal systems correctly and according to code requirements.
The next slide presents information on the basic components of a private waste disposal system – the conventional septic tank system.
The Conventional Septic Tank System
• A conventional septic system consists of a septic tank, a distribution box, a leach field, and piping between those parts.
• A septic tank system provides partial treatment of raw wastewater. It protects the soil absorption system from becoming clogged by solids that are suspending in the raw waste water.
• Applicable codes strictly regulate the use of these systems.
Code and Health Issues
Properly designed and installed DWV systems are essential to public safety. Without DWV systems, the public would be at great risk of waste borne illness and disease.
The plumbing profession has improved public health, safety, and comfort over the past 150 years. Many serious health risks have been dramatically reduced as a direct result of good plumbing, especially properly designed and installed DWV systems, and the enforcement of plumbing codes.
Plumbing codes protect the safety, health, and welfare of the public. Although code requirement varies, all codes are based on principles of sanitation and safety.
Almost all codes require the installation of cleanouts to provide access to all parts of the drainage system so that obstruction can be removed. Cleanouts range from removable plugs in horizontal drainage piping to manhole covers in building sewers.
The health issues related to the improper design, installation, and maintenance of DWV systems are significant.
Click on each button to know more about these health issues:
Diseases such as cholera, typhoid fever, typhus, and dysentery have been traced to failures in DWV system. These diseases can spread rapidly when bacteria from the sewer system enter the building through damaged or improperly installed vents and traps.
Another health issue related to DWV systems is the accumulation of toxic sewer gases. Explosion, fires, and suffocation can occur when sewer gases are not properly released through good ventilation. Controls of sewage through DWV system can eliminate many public sanitation and health problems.
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