Question

FOAM and the biologists from Humboldt state university, California created an integrated wastewater treatment, they use plants to purify mainly :-

• A. Sludge from water.
• B. Heavy metals from water.
• C. Nitrate and Phosphate from water.
• D. All of the above.

Answer 1

The correct option is A

Sludge from water.

The correct option is A.

Explanation for the correct option:

1. The major objective of FOAM is to use a natural system to clean wastewater near Arcata and the nearby bay.
2. Sewage treatment refers to a procedure that can clean up industrial and domestic wastewater of contaminants.
3. Sludge is a byproduct of the treatment of wastewater, industrial waste, or household sewage. It is a residual, semi-solid slurry. Septic tank sanitation techniques, for example, produce sludge as well.
4. A scraper is used to remove the sludge from the primary tank. It is then moved to a different tank containing anaerobic bacteria after being removed.
5. The sludge is broken down by these anaerobic bacteria to create biogas. There are several uses for this biogas.
6. As organic manure, dried sludge is employed (the substance that provides nourishment to the soil and makes it productive and fertile).
7. Organic elements rich in nutrients are abundant in dried sludge, which can promote plant growth.

Explanation for the incorrect options:

Option B:

1. Chemical precipitation, flotation, adsorption, ion exchange, and electrochemical deposition are just a few of the traditional methods used to remove heavy metals from wastewater.
2. The most popular method for removing heavy metals from inorganic wastewater is chemical precipitation.

Option C:

1. One of the main causes of eutrophication, which harms freshwater and ecosystems, is excessive nitrogen (N) and phosphorous (P) release into runoff from human activities.
2. Effective methods for removing phosphate and nitrate contaminants from water sources include chemical precipitation, biological treatment, membrane processes, electrolytic treatment, ion exchange, and adsorption.

Final answer: FOAM and the biologists from Humboldt state university, California created an integrated wastewater treatment, they use plants to purify mainly sludge from water.