Ask Question
7 April, 03:50

What substances remain in wastewater after effective secondary treatment?

+5
Answers (1)
  1. 7 April, 06:09
    0
    - The nitrates still exist after the second treatment of water waste and the way to remove it is:

    by using the enzymes in the organisms like bacteria to gradual change the NO3 to N2 to finally be able to remove the nitrogen from it.

    - The inorganic quality of the water is changed when the water is being used in a municipality; inorganic salts containing chlorides, sulfates, phosphates, potassium and sodium among those added.

    -But it removes by varies methods after the secondary treatment of water like filtration, sedimentation, and activated carbon adsorption.

    - It remains biological nutrient, and micropollutants, such as environmental persistent pharmaceutical pollutants.

    - But the secondary treatment removing dissolved and colloidal compounds measured as biochemical oxygen demand (BOD).

    - even after the primary and secondary treatment, disease-causing organisms may remain in the water.

    - To disinfect and kill harmful organisms, the water spends a minimum of 15-20 min in chlorine-contact tanks mixing with sodium hypochlorite.

    - The sludge produced by primary and secondary treatment is approximately 99 % water and must be concentrated to enable its further processing.

    -Thickening tanks allow the sludge to collect, settle and separate from water up to 24 h. The water is then sent back to the head of a plant or to the aeration tanks for additional treatment.
Know the Answer?
Not Sure About the Answer?
Find an answer to your question ✅ “What substances remain in wastewater after effective secondary treatment? ...” in 📘 Biology if you're in doubt about the correctness of the answers or there's no answer, then try to use the smart search and find answers to the similar questions.
Search for Other Answers