New Approaches in Biological Wastewater Treatment Aimed at Removal of Organic Matter and Nutrients

Abstract

The article presents the developed anaerobic-aerobic wastewater treatment technologies. These technologies aimed at removing the organic matter, nitrogen and phosphorus by means of microorganisms immobilized on fibrous carrier surfaces. The results of the laboratory research show the high efficiency of milk wastewater treatment. The following degrees of reduction were achieved for the pollutant indicators: COD -86.7-93 %, total nitrogen - 96.9-97.9 %. Compared to the traditional treatment technologies applied in Ukraine, these values are high. The concentration of organic matters and biomass of not attached bacteria decreased in bioreactor chambers. When the purification process ends, a small amount of excess biomass remains; therefore, its self-oxidation and self-regulation occurs as a result of consumption by the organisms occupying higher levels of trophic chains. The use of anaerobic-aerobic bioreactors system for the treatment of wastewater enables achieving high outflow quality and prevents the suspended substances from slipping. Immobilization of microorganisms on the first stage of the technology prevents the formation of big amount of excessive sludge and removes biomass from the bioreactor, which allows the technology even for the heavily polluted wastewater. In reactors containing immobilized microorganisms, the organic matter compounds used in subsequent reactors for phosphate accumulation are split. The presented biotechnology saves electric energy, provides sufficient quality of treatment, and ensure the compliance of treated wastewater with the effluent standards.

Retechnologization of biological sewage water treatment facilities using mathematical modelling

“…The main cause of pollution of water bodies with biogenic elements that violate the stability of the biosystem is the discharge of urban and industrial sewage water. Scientists from different countries of the world have been solving the problems of high-quality sewage water treatment to prevent eutrophication of water bodies for many years [1][2][3][4]. At the end of the twentieth century, our country tightened the standards for the discharge of pollutants into water bodies, introduced technologies for deep removal of nitrogen and phosphorus compounds from sewage water based on the recommendations of research organizations.…”

Effect of Low-Temperature Conditioning of Excess Dairy Sewage Sludge with the Use of Solidified Carbon Dioxide on the Efficiency of Methane Fermentation

“…Systems operating based on this technology allow for the simultaneous removal of carbon compounds, nitrification, denitrification, and enhanced bio-removal of phosphorus species [5]. A drawback of the aerobic wastewater treatment systems is the high energy consumption of the process resulting from the necessity of aerating bioreactors and from the intensive growth of excess sewage sludge biomass [6]. Due to the specific characteristics and properties of dairy sewage sludge, its high organic compound load, susceptibility to rotting, as well as the resultant odor nuisance and sanitary parameters, it requires effective neutralization and stabilization [7].…”

Chemical Oxidation of Polycyclic Aromatic Hydrocarbons in Water By Ferrates(VI)

“…Since there is a continuous search for appropriate water treatment methods [31][32][33][34][35][36], ferrates emerged as a potential alternative for conventional processes due to several advantages. For example, they are strong oxidants throughout the whole pH range [37].…”