Biological Sewage Treatment

Biological Sewage Treatment


a method of purifying domestic and industrial sewage, consisting of biochemical decomposition (mineralization) by microorganisms of organic substances (impurities of organic origin) dissolved and emulsified in sewage. Microorganisms (bacteria) use these substances as sources of food and energy for their life processes. In the process of the microorganisms’ respiration, organic substances are oxidized and energy necessary for their life functions is released. Part of this energy is used for the processes of synthesizing cellular substances, that is, for increasing the mass of bacteria, the quantity of active sludge, and the thickness of the biologic film in the purifying structures. Bacteria that participate in the mineralization of organic compounds in sewage may be divided into two groups, according to their relationship to oxygen: aerobes (which use oxygen dissolved in water for respiration) and anaerobes (which develop in the absence of free oxygen). Besides dissolved organic substances, sewage contains suspended substances, tars, and oils, which must be removed before biologic treatment. For this purpose, gratings, sand traps, and settling tanks are used. Aerobic biological purification is accomplished under conditions close to natural ones, in irrigation fields and filtration fields and in biologic ponds; and, when the life processes of the microorganisms become intensified, in an artificially created environment, in aerotanks, aerofilters, and biofilters. In the anaerobic method of purification, methane tanks are used. Choice of the type of structure is determined by the character and quantity of the sewage, local conditions, requirements as to quality of the purified sewage, and so on. As a result of complete purification, biochemically oxidized organic substances are virtually absent from the water. The water loses its ability to putrefy and becomes transparent, and bacterial contamination is significantly decreased. Biologic treatment is only used for sewage containing a sufficient quantity of biogenic elements (nitrogen, phosphorus, potassium) necessary to the life processes of microorganisms. In a number of cases, biogenic elements are added to sewage before biologic treatment, in the form of salt solutions.


Kanalizatsiia, 4th ed. Edited by A. I. Zhukov. Moscow, 1969.


Mentioned in ?
References in periodicals archive ?
In Hong Kong SAR, Black & Veatch has secured several key projects, which include the investigation study of expansion of the Tai Po Water Treatment Works from 250 to 1200 MLD;the feasibility study of using the space below a future freight yard to accommodate part of a future biological sewage treatment plant on Stonecutters Island; and investigation, design and construction of village sewerage schemes in the North District, Tseung Kwan O and Tuen Mun of Hong Kong.
It is a mechanical biological sewage treatment plant.
The visit of the Nizhnekamsk public representatives to TANECO began with touring the territory of the refinery complex, which included visits to the modern biological sewage treatment facilities, delayed coking unit and central control room.
5 m), gas station - 5x, building a biological sewage treatment plant with a capacity of 1050 EO village Kralice nad Oslavou.
388, 391 / 1 - precinct 0013 Guzowatka task involves the execution of mechanical - biological sewage treatment plant with a capacity of Qdsr = 235m / di bandwidth Qdmax = 300 m / d, based on the so-called.
Wilo SE has acquired Wulfrath, Germany headquartered GVA (Gesellschaft fur Verfahren der Abwassertechnik mbH & Co KG), a German company which specialises in system technology and components for biological sewage treatment.
Construction law involving the construction of 100 biological sewage treatment plants PBOS at individual farms and public buildings (equipment properties) in the Municipality Grabow nad Pilica according to the statement given in the specification.
Tenders are invited for Supplying Installation And Commissioning Of Portable Modular Type Biological Sewage Treatment Plant Along With All Electrical And Mechanical Parts
5 m, DN 150 - 1190 m), gas station - 5x, building a biological sewage treatment plant in the municipality Kralice nad Oslavou.
Tenders are invited for : Choice aeration technology and development of design estimates for reconstruction of the aeration system of biological sewage treatment KOS left bank.

Full browser ?