Wastewater
Wastewater, also written as waste water, is any water that has been adversely affected in quality by anthropogenic influence. Wastewater can originate from a combination of domestic, industrial, commercial or agricultural activities, surface runoff or stormwater, and from sewer inf…
What are the three stages of wastewater treatment?
Apr 08, 2022 · Secondary treatment of wastewater is a process that follows the primary treatment of sewage. Secondary treatment aims to remove the remaining organic matter and suspended solids from the wastewater. The secondary sewage treatment is not as efficient in removing the contaminants as the primary treatment of sewage.
What is the primary treatment of wastewater?
Wastewater Treatment (Secondary Treatment) 1 General plant Flow diagram M&E (4thed) 2 SECONDARY TREATMENT Purpose: •The main purpose of secondary treatment is to remove BOD which does not benefit as much as SS from primary settling. •It is a process which is capable of biodegrading the organic matter into non-polluting end products ,e.g. Water,CO
What is secondary waste treatment?
Secondary Wastewater treatment is the second stage of wastewater treatment. In primary treatment, suspended solids, colloidal particles, oil, and grease are removed. In secondary treatment, biological treatment is done on the wastewater to remove the organic matter present.
What is secondary water treatment?
Sep 14, 2021 · Secondary Treatment of Wastewater involves removal of biodegradable organic matter using microbial community. The microbial biomass present in the wastewater reproduce in certain ways and during the process they utilize organic matters, minerals and various other growth related substances from the wastewater.
What is meant by secondary treatment of wastewater?
Secondary treatment is the second step in most waste treatment systems during which bacteria consume the organic parts of the wastes. This is accomplished by bringing the sewage, bacteria and oxygen together in trickling filters or within an activated sludge process.Mar 13, 2003
What is secondary treatment?
Secondary treatment removes the soluble organic matter that escapes primary treatment. It also removes more of the suspended solids. Removal is usually accomplished by biological processes in which microbes consume the organic impurities as food, converting them into carbon dioxide, water, and energy…
What happens in the secondary stage of wastewater treatment?
The secondary stage of treatment removes about 85 percent of the organic matter in sewage by making use of the bacteria in it. The principal secondary treatment techniques used in secondary treatment are the trickling filter and the activated sludge process.
What is primary and secondary wastewater treatment?
The main difference is the way each respective treatment is processed. Primary treatment works on sedimentation, where solids separate from the water through several different tanks. In contrast, secondary treatment uses aeration, biofiltration and the interaction of waste throughout its process.Nov 19, 2020
What is secondary treatment or biological treatment?
Secondary treatment removes the dissolved organic matter by the use of biological agents and hence, known as biological treatment. This is achieved by microbes which can consume and degrade the organic matter converting it to carbon dioxide, water, and energy for their own growth and reproduction.
What are the 3 stages of wastewater treatment?
There are three main stages of the wastewater treatment process, aptly known as primary, secondary and tertiary water treatment.Dec 6, 2018
What is secondary waste?
Secondary waste is waste generated from different sources and of different nature, i.e. waste generated in a process that is known as a waste treatment operation; it includes residual materials originating from recovery and disposal operations, such as incineration and composting residues.Jun 8, 2015
What is the purpose of secondary clarifiers?
secondary clarifiers is to separate biological floc from the treated liquid waste stream. Secondary clarifiers are most often discussed in conjunction with suspended growth biological wastewater treatment systems.
What are the objectives of secondary treatment processes?
The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids. H2O etc. The objective of secondary treatment is the further treatment of the effluent from primary treatment to remove the residual organics and suspended solids.
What is secondary and primary treatment?
The initial and primary water treatment process removes large matter from wastewater while the secondary treatment will remove smaller particles already dissolved or suspended.Jun 26, 2018
What is the key difference between primary and secondary treatment?
Primary sewage treatment is a physical process that removes large impurities while secondary sewage treatment is a biological process that removes organic matter of sewage through the action of microbes. Was this answer helpful?
What is the difference between primary and secondary clarifiers?
Meanwhile, oil and grease float to the surface and is skimmed off. A typical primary clarifier removes 60 percent of suspended solids and 30 to 40 percent of Biological Oxygen Demand (BOD). Secondary clarification follows the biological treatment process with the main goal of returning activated sludge.
What is secondary treatment?
The secondary treatment is designed to remove soluble organics from the wastewater. Secondary treatment consists of a biological process and secondary settling is designed to substantially degrade the biological content of the sewage such as are derived from human waste, food waste, soaps and detergent.
What is the purpose of sewage treatment?
The purpose of the sewage treatment is to remove the solids present in the sewage. ROLE OF MICROORGANISMS. Microorganisms are unicellular microscopic living things. They multiply by binary division of cells within 10 to 20 minutes. They require oxygen for their respiration.
What are the objectives of biological treatment?
The overall objectives of the biological treatment of domestic wastewater are: 1 To oxidize or transform dissolved and suspended biodegradable substances into acceptable end products; 2 To capture and incorporate suspended non-settleable colloidal solids into biological floc or bio film, and 3 To transform and remove nutrients such as nitrogen and phosphorous.
What is activated sludge?
The activated sludge process (ASP) is an aerobic biological wastewater treatment process that uses microorganisms, including bacteria, fungi, and protozoa, to speed up decomposition of organic matter requiring oxygen for treatment.
What are some examples of organic solids?
Organic solids are the substances derived from living things like produces from plant and animal. Examples of organic solids are carbohydrate, protein, and fat. The organic solids undergo decomposition by the microorganisms. Inorganic solids are inert materials and they do not undergo decomposition. Examples of inorganic solids are grit, salt etc.
What are the end products of decomposition?
The end products of the decomposition are water, CO 2 and Cell tissues. Anaerobic bacteria use oxygen derived from chemical substances for their respiration. They multiply in the absence of DO in the water bodies. They oxidize the organic matter under septic conditions.
What are the two types of biological processes?
TYPES OF BIOLOGICAL PROCESSES. There are two types of biological treatment process; aerobic and anaerobic. Aerobic process means that oxygen is present for the microbes for respiration. Anaerobic process means that the process proceeds in the absence of DO.
What are secondary treatment standards?
Secondary treatment standards also provide for special considerations regarding: 1 treatment plants that receive flows from combined sewers, 2 treatment plants that received industrial wastes, 3 waste stabilization ponds, and 4 treatment plants that receive less concentrated influent wastewater for combined and separate sewers.
What is a treatment plant?
treatment plants that receive flows from combined sewers, treatment plants that received industrial wastes, treatment plants that receive less concentrated influent wastewater for combined and separate sewers.
What is the main objective of secondary treatment?
The main objective of secondary treatment: To remove most of the fine suspended and dissolved degradable organic matter that remains after primary treatment, so that the effluent may be rendered suitable for discharge. Conventional secondary treatment can reduce the BOD's to below 20mg/l and Suspended Solids to below 30mg/l which is acceptable in ...
What is nitrification in biology?
Nitrification: Means the oxidation of ammonia to nitrate. Nitrification is possible with aerobic biological processes. If they are operated at low organic load rates-hence the units must be large than those which would be required for oxidation of carbonaceous matter alone.
What is aerobic biological process?
Aerobic Biological Processes. Are those where sufficed amount of dissolved oxygen is required into the wastewater to sustain aerobic action, as one of the major polluting effects of wastewater on streams results form the depletion of dissolved oxygen by the action of aerobic organisms in degrading the organic content of the waste.
What is a trickling filter?
It is the most common attached growth process. The trickling filter is like a circular well having depth up to 2 meter filled with granular media like stone, plastic sheets and redwood, slag, slate. The first tricking filter was placed in operation in England in 1893. the concept of a tricking filter was grew form the of contact frets which were water tight basins filled with broken stones. The limitation the contact filters included a relatively.
