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51 Cards in this Set
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It consist of sludge particles produced in raw or settled waste water(primary effluent) by the growth of organism in aeration tanks in the presence of dissolve oxygen.
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Activated sludge
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What are the two present bacteria on activated sludge
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. Fungi
. Protozoa |
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It is a biological waste water treatment process speeding up decomposition of wastes water being treated. Activated sludge is being added to waste water, and the mixture(mixed liquor) is aerated and agitated. After some time in the aeration tank, the activated sludge settles out by sedimentation and is disposed of (waste) or reused (returned to the aeration tank) as needed. The remaining waste water undergoes more treatment.
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Activated sludge process
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Is waste breakdown by microorganisms in dissolved oxygen. Waste sludge is placed in a large aerated tank where aerobic microorganism decompose the organic matter in sludge. This is an extension of the activated sludge process
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Aerobic digestion
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Occurs when waste water solids and water (about 5% solids, 95% water) are placed in a large tank where bacteria decomposed the solids in the absence of dissolve oxygen
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Anaerobic digestion
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What are the two general groups of bacteria act in balance on anaerobic digestion
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. Saprophytic bacteria- breakdown complex solids to volatile acids
. Methane fermenters- breakdown the acids to methane, carbon dioxide, and water |
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Are microscopic living organism consisting of single cell.
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Bacteria
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Bacteria that live and reproduce only in environments containing oxygen for their respiration (breathing)
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Aerobic bacteria
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Bacteria that live and reproduce in an environment containing no free or dissolved oxygen
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Anaerobic bacteria
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Bacteria that can live under aerobic or anaerobic conditions
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Facultative bacteria
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Are bacteria, viruses, or cysts that can cause disease (typhoid, cholera, and dysentery )
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Pathogenic
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Are organisms (bacteria ) living on dead or decaying organic matter. They help natural decomposition of organic solids in waste water
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Saprophytic bacteria
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Is a flat board, plate, deflector, guide or similar device constructed or placed in flowing water, waste water or slurry systems to cause more uniform flow velocities, absorb energy, and divert, guide, or agitate liquids
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Baffle
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Is the rate microorganism use oxygen in water or waste water while stabilizing decomposable organic matter under aerobic conditions.
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Biochemical Oxygen Demand
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Is a mechanical treatment process that cuts large pieces of waste into smaller pieces so they will not plug pipes or damage equipment
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Comminution (shredding)
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Is a device (porous plate, tube, and bag) used to break the air stream from the blower system into fine bubbles in an aeration tank or reactor
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Diffuser
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Is a tank where sludge is placed to allow decomposition by microorganism.
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Digester
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Is the process that kills most microorganism in waste water, including essentially all pathogenic bacteria.
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Disinfection
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What is the most frequent way to disinfect
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Used of chlorine
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Is a molecular oxygen dissolved in water or waste water
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Dissolved oxygen
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Are solids in water or waste water consisting mainly of inorganic salts, small amount of organic matter, and dissolved gases that will pass through a filter with the water
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Dissolve solids (filter able residue)
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Is the rotating mechanism that distributes the waste water evenly over the surface of a trickling filter or other process unit
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Distributor
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Is waste water or other liquid (raw, or partially or completely treated) flowing from basin, treatment process, or treatment plant
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Effluent
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Are the facilities where waste water enters a wastewater treatment plant. It may consist of bar screens, comminutors, a wet well, and pumps
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Head works
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Is a deep two-story tank having an upper, continues sedimentation chamber and a lower, sludge-digestion chamber
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Imhoff tank
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Is a waste water or other liquid (raw or partially treated) flowing into reservoir , basin, treatment process, or treatment plant
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Influent
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Is a waste material such as sand, salt, iron, calcium, and other mineral materials which are only slightly affected by the action of organism
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Inorganic waste
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Are substance required to support living plants and organism
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Nutrients
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What are the major nutrients that are difficult to remove from wastewater by conventional treatment process. They are water soluble and tend to recycle
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. Nitrogen
. Phosphorus |
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Is a waste material from animal or vegetable sources. Generally can be consumed by bacteria and other small organism
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Organic waste
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Is the movement or flow of water through soil or rocks
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Percolation
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Is any change in the natural state of water which interferes with its beneficial reuse or causes failure to meet water-quality requirements
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Pollution
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Is the removal of metal, rocks, rags, sand, eggshell, and similar materials which may hinder the operation of a treatment plant. It is accomplished by using equipment such as rocks, bar screens, comminutors, and grit removal system
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Pretreatment (preliminary treatment)
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Is the wastewater treatment process used to convert dissolved or suspended materials into a form more readily separated from the water being treated
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Secondary treatment
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Is a waste water solids floating at the surface, buoyed up by entrained gas, grease, or other substances.
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Scum
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It refers to a mass of sludge containing very concentrated population of microorganism
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Seed sludge
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Is the settling tank that retains the sludge in immediate contact with the wastewater flowing through it. Sludge is retained long enough to secure satisfactory decomposition of organic solids by anaerobic bacterial action
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Septic tank
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Is the used water and solids from homes flowing to a treatment plant. The preferred term is "wastewater"
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Sewage
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Is the arrival at plant of waste which is toxic to organism in sufficient quantity or strength to cause operating problem. Possible problem include odors and sloughing off of the growth or slime on the trickling media
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Shock load
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Is the settable solids separated from liquids during processing, or deposits of foreign materials found on a stream bottom or any body of water
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Sludge
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Solids that either float on the surface of, or are in suspension in water, waste water, or other liquids, and are largely removable by laboratory filtering, or the quantity of material removed from wastewater in a laboratory test.
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Suspended solid (non-filterable residue)
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Is the liquid removed from settled sludge, and commonly refers to the liquid between the sludge on the bottom and the scum on the surface of an anaerobic digester. This liquid is usually returned to either the influent wet well or to the primary clarifier
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Supernatant
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Is any process of water renovation that upgrades treated wastewater to meet specific reuse requirement
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Tertiary treatment (advance waste treatment)
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Is a wall or plate placed on an open channel used to measure flow. Is also a wall or obstruction used to control flow (from clarifiers) to assure uniform flow and avoid short-circuiting
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Weir
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A compartment or room in which wastewater is collected. The suction pipe of a pump may be connected to the it, or submersible pump may be located in it
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Wet well
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What are the types of waste discharge
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. Domestic
. Industrial . Thermal heated waste . Radioactive (nuclear) waste |
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If pathogenic bacteria are not treated and are deposited into receiving waters, what are the diseases may occur
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. Typhoid
. Cholera . Dysentery . Polio |
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What are the reasons for water treatment
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. Domestic use
. Aquatic life . Recreational use . Industrial use |
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What are the types of solids in wastewater
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. Dissolved solids
. Suspended solid |
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This is the total residue of solid waste contained in wastewater
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Total solids
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What are the four categories of suspended solid
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. Settlable solid
. Non-Settlable solid . Floatable . Organic and inorganic |