Wastewater Purification
Wastewater Purification - Related Videos
05:40
Comparison of Scale in a Photosynthetic Reactor System for Algal Remediation of Wastewater
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Cited by 3 •
2017
An experimental methodology is presented to compare the performance of small (100 L) and large (1,000 L) scale reactors designed for algae remediation of landfill wastewater. System characteristics, including surface area to volume ratio, retention time, biomass density, and wastewater feed concentrations, can be adjusted based on application.
09:49
Use of a Battery of Chemical and Ecotoxicological Methods for the Assessment of the Efficacy of Wastewater Treatment Processes to Remove Estrogenic Potency
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Cited by 7 •
2016
Endocrine Disrupting Compounds (EDC) pose a substantial risk to the aquatic environment. Municipal wastewater treatment plants are major contributors to the estrogenic potency of surface waters. The methodology provided in this paper allows for an assessment of the efficacy and suitability of wastewater treatment processes with respect to EDC removal.
01:30
Microbial Wastewater Treatment
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2026
Microbial communities in aquatic ecosystems play a key role in the natural breakdown of contaminants introduced through domestic and industrial effluents. Acting as biological catalysts, these microbes change and mineralize a wide range of organic and inorganic pollutants under different redox conditions.In oxygen-rich surface waters, aerobic heterotrophs lead organic matter breakdown, using oxygen as the terminal electron acceptor to efficiently oxidize substrates to carbon dioxide and water.
08:16
Plasmid Purification
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2023
Plasmid purification is a technique used to isolate and purify plasmid DNA from genomic DNA, proteins, ribosomes, and the bacterial cell wall. A plasmid is a small, circular, double-stranded DNA that is used as a carrier of specific DNA molecules. When introduced into a host organism via transformation, a plasmid will be replicated, creating numerous copies of the DNA fragment under study. In this video, a step-by-step generalized procedure is described for how to perform plasmid purification.
06:30
Gel Purification
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2023
Gel purification is used to recover DNA fragments after electrophoretic separation. DNA recovery from an agarose gel includes three basic steps: binding, washing and eluting from a silica column. DNA is believed to bind to silica in the presence of high salt via a salt bridge. Following binding, DNA is washed of impurities and eluted under low salt conditions disrupting this interaction. This video goes through a step-by-step, generalized procedure for cutting out a band from the gel, gel...
FAQs
Coagulants remove colloidal material by destabilizing the particles’ surface charge, allowing them to form larger flocs. These flocs are easier to separate during subsequent physical treatment than the original dispersed particles. This chemical principle matters for suspended contaminants that do not settle efficiently on their own, because changing particle interactions converts a stable dispersion into a removable form.
pH, solubility, surface charge, and redox potential help determine how contaminants behave during treatment. These properties guide whether a substance is more likely to remain dissolved, be captured, or undergo transformation. As a result, wastewater purification design must match the contaminant’s chemistry rather than rely on one universal process. This perspective explains why different stages work together.
Oxidation, adsorption, and microbial reactions address dissolved contaminants through different chemical routes. Oxidation transforms them, adsorption captures them on a surface, and microbial reactions transform them biologically. These approaches are not interchangeable: the suitable choice depends on contaminant behavior and the treatment objective. Together with particle-separation steps, they extend purification beyond pollutants that can be removed as suspended solids.
A treatment sequence can combine screening and settling to remove particles, followed by coagulation when colloids require destabilization. Later stages may use oxidation, adsorption, or microbial reactions for dissolved contaminants. This staged approach assigns different pollutant types to processes suited to them, aligning the overall treatment train with wastewater composition and the intended purification objective.
After appropriate treatment, purified water can support safe discharge, industrial reuse, or resource recovery. These outcomes give wastewater purification goals beyond simple pollutant removal: discharge reduces risks to ecosystems and public health, reuse returns water to productive settings, and resource recovery extends the value of treatment. The appropriate pathway depends on the treatment objective and resulting water quality.
Chemistry connects wastewater purification to environmental protection by explaining how contaminants respond to treatment conditions. Physical separation handles particles, while chemical and biological reactions address dissolved pollutants through destabilization, transformation, or capture. Understanding these interactions helps reduce pollutant release and supports water-quality goals linked to ecosystem protection and public health.