What is Aeration for Wastewater Treatment?
Mar 17, 2022 — Aeration is an activated sludge process, promoting microbial growth in the wastewater. The microbes then feed on organic material, forming flocks which easily settle out. Once settled in a separate settling tank, bacteria forming the "activated sludge" flocks are continually recirculated back to the aeration basin, increasing decomposition rates.
What is Wastewater? | Wastewater Digest
Dec 1, 2021 — Wastewater is used water that has been affected by domestic, industrial and commercial use. The composition of all wastewaters is thus constantly changing and highly variable, which is why it is so difficult to pinpoint a singular definition of the word itself. The composition of wastewater is 99.9% water and the remaining 0.1% is what is removed.
What is Water Filtration? - Wastewater Digest
Nov 10, 2021 — Definition. Filtration is the process in which solid particles in a liquid or gaseous fluid are removed by the use of a filter medium that allows the fluid to pass through while retaining the solid particles. It may mean the use of a physical barrier, chemical, and/or a biological process. The removal of particles takes place with processes ...
What is Coagulation for Water Treatment? - Wastewater Digest
Mar 8, 2022 — Coagulation treatment is usually carried out before sedimentation and filtration. During the process, a coagulant is added to water, and its positive charge neutralizes the negative charge of suspended contaminants. Neutralization causes suspended particles to bind together (hence the term). In clumps known as “flocs”, these particles sink ...
What is mixed liquor suspended solids? | Wastewater Digest
Sep 27, 2023 — Mixed liquor suspended solids (MLSS) is the suspended solids in the mixed liquor of an aeration tank. Mixed liquor is the mixture of the chemical components from the wastewater and the microbial components from the activated sludge. Suspended solids are the solids found in the liquor that do not dissolve but are dispersed throughout the liquid.
What is Biological Oxygen Demand (BOD)? - Wastewater Digest
Oct 27, 2021 — Sources of BOD. Sources of biological oxygen demand include leaves and woody debris; dead plants and animals; animal manure; effluents from pulp and paper mills, wastewater treatment plants, feedlots, and food-processing plants; failing septic systems; and urban storm water runoff.. One of the most important nutrients affecting BOD in aquatic systems — especially in recent times — is ...
What is Activated Sludge? - Wastewater Digest
Jun 17, 2021 — How the activated sludge process works. The activated sludge process is designed to speed up the rate of decomposition of waste material in water and was first developed in 1914, according to the International Water Association. The activated sludge process was first tested at the Manchester - Davyhulme Wastewater Treatment Plant, in a "mobile" pilot-plant.
What is Total Suspended Solids (TSS)? - Wastewater Digest
Sep 9, 2021 — TSS stands for total suspended solids, and refers to waterborne particles that exceed 2 microns in size. Any particle that is smaller than 2 microns, on the other hand, is considered a total dissolved solid (TDS). The majority of total suspended solids comprise of inorganic materials; however, algae and bacteria may also be considered TSS.
What is Total Dissolved Solids (TDS)? - Wastewater Digest
Jul 12, 2021 — A total dissolved solids meter is a handheld device that can be used to give a TDS reading of a water source. Searches on line reveal TDS meters priced between $10 and $100, depending on the brand and the complexity of the device. Dissolved solids naturally increase water’s conductivity. A TDS meter, therefore, measures the conductivity of a ...
What is point source pollution? - Wastewater Digest
Aug 30, 2023 — The legal definition of point source pollution is in section 502(14) of the Clean Water Act which states: . The term “point source” means any discernible, confined and discrete conveyance, including but not limited to any pipe, ditch, channel, tunnel, conduit, well, discrete fissure, container, rolling stock, concentrated animal …