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The MCQs below are drawn from the Environmental Science subject category.
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81
Which type of bacteria thrives in sewage environments that lack free dissolved oxygen?
Anaerobic bacteria are microorganisms that do not require oxygen for respiration. In sewage treatment, these bacteria are essential for breaking down organic matter in the absence of oxygen, a process often utilized in anaerobic digesters to stabilize sludge and produce biogas as a renewable energy byproduct.
82
What is the typical efficiency range for the reduction of bacterial load during the secondary wastewater treatment process?
Secondary wastewater treatment, which primarily utilizes biological processes like activated sludge or trickling filters, is highly effective at removing organic matter and pathogens. It typically achieves a bacterial load reduction in the range of 80% to 98%, significantly improving the quality of the effluent before it is discharged or subjected to tertiary treatment.
83
Which specific substance undergoes oxidation during the second stage of aerobic decomposition?
In the process of aerobic decomposition, the breakdown of organic waste occurs in distinct stages. The first stage typically involves the oxidation of carbonaceous matter. Following this, the second stage involves the oxidation of nitrogenous matter, a process often referred to as nitrification. During this phase, ammonia is converted into nitrites and subsequently into nitrates by specialized bacteria, which is a crucial step in the nitrogen cycle within wastewater treatment systems.
84
What is the typical efficiency range for solid reduction during the secondary wastewater treatment process?
Secondary wastewater treatment utilizes biological processes, such as activated sludge or trickling filters, to remove dissolved and suspended organic matter. These processes are highly effective, typically achieving a solid reduction efficiency ranging from 70% to 92% depending on the specific technology and operational parameters used.
85
Which type of bacteria thrives in sewage environments that contain high levels of free dissolved oxygen?
Aerobic bacteria are microorganisms that require free dissolved oxygen to perform metabolic processes and break down organic matter. In sewage treatment systems, these bacteria are essential for the biological oxidation of pollutants, effectively reducing the organic load in the wastewater when sufficient aeration is provided.
86
Which organisms are primarily responsible for the decomposition of organic matter during the secondary treatment of wastewater?
Secondary wastewater treatment is a biological process that utilizes aerobic bacteria to break down dissolved organic matter. These bacteria consume the organic pollutants in the presence of oxygen, effectively reducing the biochemical oxygen demand (BOD) of the effluent before it is discharged.
87
How many distinct stages are typically identified in the process of aerobic decomposition?
Aerobic decomposition is generally categorized into two primary stages: the initial breakdown of complex organic matter into simpler compounds by microorganisms, and the subsequent oxidation of these intermediates into stable end products like carbon dioxide, water, and biomass. This biological process requires the presence of oxygen to facilitate efficient microbial metabolism.
88
What chemical process occurs to carbonaceous matter during the initial stage of aerobic decomposition?
Aerobic decomposition is a biological process where microorganisms break down organic matter in the presence of oxygen. During this process, carbonaceous compounds are oxidized, converting them into carbon dioxide, water, and energy, which the microorganisms use for growth and metabolic activities.
89
What is another common term used to describe the secondary treatment phase in wastewater management?
Secondary treatment is primarily a biological process designed to remove dissolved and suspended organic matter from wastewater. It utilizes microorganisms, such as bacteria and protozoa, to consume organic pollutants in an aerobic environment. Because of this reliance on biological activity, it is widely referred to as biological treatment in wastewater engineering.
90
Which environmental phenomenon is primarily responsible for a projected 10% loss of habitat land?
Sea level rise is a direct consequence of global warming and climate change, leading to the inundation of coastal habitats. As sea levels increase, low-lying coastal ecosystems are submerged, resulting in significant habitat loss for various species. While climate change and global warming are the broader drivers, sea level rise is the specific mechanism causing the physical loss of land area in coastal regions.
