Figure 5.4 described the major organism groups important to environmental engine

Question

Figure 5.4 described the major organism groups important to environmental engineering, many which are used in treatment of domestic, agricultural, and industrial wastes. Identify the major organism groups listed in this figure (e.g., viruses, bacteria, algae, protozoa, rotifers) that: (a) use solar energy to transfer oxygen into wastewater stabilization ponds (i.e., lagoons), (b) are key organisms in the removal of the organic matter that makes up biochemical oxygen demand in wastewater, (c) are single-cell organisms found in biological wastewater treatment and resource recovery systems that feed on bacteria and algae, (d) are multi-cellular organisms found in biological wastewater systems, (e) include the gram-positive organism, Nocardia, which is normally found in wastewater treatment plants, but if it experiences excessive growth, can result in foaming and poor settling of solids in the secondary settling reactor (i.e., clarifier)

Explanation / Answer

a) organism that use solar energy to transfer oxygen into wastewater stabilization ponds or lagoons - Algae and aerobic bacteria.  Wastewater treatment takes place naturally in many aerobic lagoons with the aid of aerobic bacteria and algae.

b) Organisms that remove organic matter and make up Biological oxygen demand in waste water - Bacteria

c) Single cell organism found in biological waste water treatment and that feed on bacteria and fungi - Protozoa, viruses, rotifers

d) Multi-cellular organisms found in biological waste water system - Fungi, algae, fish, rotifers, macroinvertebrates, microcrustaceans

e) gram positive bacteria causes foaming in biological waste water treatment and rrsponsible for foaming and clarifer - M. parvicella , Gordonia amarae

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