What health threat is commonly found in the water of older homes due to old plumbing systems? lead .
What substance is believed to be responsible for the development of eggs in the testes of some male fish?
Researchers found high levels of vitellogenin —a protein involved in producing egg yolk—in many smallmouth bass. In male fish, the gene that tells the body to produce vitellogenin is usually “turned off,” explains Iwanowicz. That gene only “switches on” in the presence of estrogen, a female sex hormone.
Which toxic substance can be found in the water of buildings with old plumbing systems?
Lead can enter drinking water when plumbing materials that contain lead corrode, especially where the water has high acidity or low mineral content that corrodes pipes and fixtures. The most common sources of lead in drinking water are lead pipes, faucets, and fixtures.
What happens to sludge from sewage treatment plant quizlet?
Water is removed from sludge . Water undergoes aeration to reduce offensive odors. Solid waste material settles out. Bacteria breaks down organic matter.
Which pollutant is most likely to be naturally released into groundwater supplies from the surrounding bedrock?
Nitrate . Nitrate is the most common chemical contaminant in the world’s groundwater and aquifers.
What are the 4 major indoor air pollutants?
The Environmental Protection Agency has noted that excess moisture, volatile organic compounds, carbon monoxide, and radon are four major indoor air pollutants.
What are the major potential pollutants that are found in your house?
- Asbestos.
- Biological Pollutants.
- Carbon Monoxide (CO)
- Cookstoves.
- Formaldehyde/Pressed Wood Products.
- Lead (Pb)
- Nitrogen Dioxide (NO 2 )
- Pesticides.
Can male fish lay eggs?
Most fish species spawn eggs that are fertilized externally, typically with the male inseminating the eggs after the female lays them.
Which situation would be the most difficult to address and clean up?
Groundwater pollution is difficult to clean up because aquifers recharge slowly and because pollutants cling to the materials make up an aquifer. Groundwater is polluted by many different sources so it is hard to control all the pollutants.
What substance is believed to be responsible for the development of eggs in the testes?
Follicle stimulating hormone is one of the gonadotrophic hormones, the other being luteinising hormone. Both are released by the pituitary gland into the bloodstream. Follicle stimulating hormone is one of the hormones essential to pubertal development and the function of women’s ovaries and men’s testes.
What happens to sludge from a sewage treatment plant?
The residue that accumulates in sewage treatment plants is called sludge (or biosolids). ... The thickened sludge is pulped with steam, then passed to thermal hydrolysis , where large molecules such as proteins and lipids are broken down under heat and pressure.
What is the correct order for sewage treatment?
- Step 1: Screening and Pumping. ...
- Step 2: Grit Removal. ...
- Step 3: Primary Settling. ...
- Step 4: Aeration / Activated Sludge. ...
- Step 5: Secondary Settling. ...
- Step 6: Filtration. ...
- Step 7: Disinfection. ...
- Step 8: Oxygen Uptake.
What is most likely to create eutrophic areas?
- Sewage water from toilets.
- Water from showering and bathing.
- Water from washing clothes.
What are two main sources of pollution of surface water?
- Industrial Waste. Industries and industrial sites across the world are a major contributor to water pollution. ...
- Marine Dumping. ...
- Sewage and Wastewater. ...
- Oil Leaks and Spills. ...
- Agriculture. ...
- Global Warming. ...
- Radioactive Waste.
What are two main sources of groundwater pollution?
There are two types of groundwater contamination sources: point sources and non-point sources . Point sources include landfills, leaking gasoline storage tanks, leaking septic tanks and accidental spills; as the name implies we can point directly to the source of contamination.
How far can contaminated groundwater travel?
The average MTBE travel distance was 300 feet. The maximum distance documented between a discharge source and a contaminated well was 1670 feet .
