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Environmental Safety and Health

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Describe the stages for processing sewage. At what stage of processing is it permissible in the United States to dispose of wastewater from sewage into waterways?
What health-related considerations relate to the use of recycled water? What level of processing is required for wastewater to be recycled? Describe some of the uses of recycled water.
Even though workers in professional occupations usually are not exposed directly to hazardous agents, they are prone to occupationally associated illnesses. What types of hazards and associated illnesses predominate in professional occupations? What interventions would you propose to mitigate these hazards?

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Understanding Environmental Health in Totality

1. Describe the stages for processing sewage. At what stage of processing is it permissible in the United States to dispose of wastewater from sewage into waterways?

The stages for processing sewage is divided into three phases: pretreatment, primary treatment, and secondary treatment.

Pretreatment

The large solids and heavy solids are removed by screening. They are disposed of in landfills.

Primary Treatment

The water is left to stand so that solids can sink to the bottom and oil and grease can rise to the surface. The solids are scraped off the bottom and the scum is washed off with water jets. The two substances are combined to form sludge.

Secondary treatment

The sludge is treated by using chemical decomposition and microorganisms. The sludge is largely converted to "biogas", a mixture of CH4 and CO2 that is used to generate electricity for the plant.
The liquid is treated by bacteria that break down the organic matter remaining in solution. It is sent to oxidation ...

Solution Summary

Environmental safety and health is a concern that must be addressed. The problem of sewage, exposure to chemicals and radiation, and risk of recycled water must be addressed and solved. Most occupation required safety protocol to follow to prevent exposure to environmental hazards. They must be followed to prevent further injuries and exposure.

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