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Currently, there is an increase in the output of volumes of products of refineries, which leads to the contamination of the water basin by hazardous substances - such as dissolved refined products. Pollution of water resources leads to deterioration of the ecological situation. Existing cleaning methods, such as mechanical cleaning, reagent cleaning, hydrocyclones cleaning, sewage from oil products are not effective. These methods do not provide for the purification of effluents to the required MPC or are costly, ...

Since 1860, phenol has been in production, with its basic use as an antiseptic. During late 19th century and thereafter the use of phenol has been further extended to the synthesis of dyes, aspirin, plastics, pharmaceuticals, petrochemical and pesticide chemical industries. In fact, by 2001, the global phenol production has reached an impressive 7.8 million tons. Among the different organic pollutants in wastewater, phenols are considered as priority pollutants since they are harmful to plants, animals and human, ...

Wastewater treatment plants are essential in terms of environmental protection. The processes taking place into wastewater treatment plants are complex and require specialized machinery and equipment capable of operating in special conditions. Starting with the Sequential batch reactor (SBR) system (biological mechanical, chemical processes are carried out in the same basin), it could be reached a complex architecture with separate tanks, resulting scheme with predenitrification-nitrification, nitrification-postde...

Innovative aerobic granular sludge (AGS) technology has proved its ability to remove organic pollutants and nutrients from wastewater treatment at the same efficiency, but at a lower costs than conventional biological process. This technology has been successfully applied in sequencing batch reactor (SBR) configuration. An experimental model bioreactor was designed for adapting the AGS technology to continuous flow conditions. This paper presents numerical results for hydrodynamics and air dispersion into bioreact...

Wastewater treatment plants that currently lack biological step have a low efficiency in wastewater treatment. This causes polluted emissions to be discharged into emissaries. An example of this is Drobeta Turnu Severin wastewater treatment plant. Drobeta Turnu Severin City in Mehedinti county currently has 108 246 inhabitants, of which 80% benefit from centralized drinking water distribution and centralized system for collecting and transporting wastewater to the treatment plant. Drobeta Turnu Severin has a waste...

The importance of the ecological exploitation of the treated sludge consists in the fact that it is generated in the treatment plants 365 days from 365, 24 hours from 24, but unfortunately the sludge exploitation is limited nowadays, no matter the chosen option. Practically there are no standard solutions, all the research options, respectively the exploitation of the sludge require costs and cooperation with the thirds, plus the sludge quality must conform to certain values imposed by law. The difficulty elements...

The EU?s concentration limit for discharge from wastewater treatment plants is 1 or 2 mg P/dm3 for total phosphorus, signifying a P removal of 80% or more, in order to protect the environment, in sensitive areas which are subject to eutrophication. A membrane bioreactor (MBR) can bused for wastewater treatment, transforming it into reusable water when a tertiary treatment such as nanofiltration (NF) is applied. This step produces a concentrated waste stream. Membrane bioreactors (MBR) permeates are a potentially s...

Biological treatment is one of the most efficient process to remove biodegradable pollutants from wastewater. In practice, this process use air and activated sludge for well over a century. It is largely influenced by aeration equipment, which in addition to introducing oxygen into wastewater for oxidation of organic pollutants, they have to create hydrodynamic conditions to mix wastewater with microorganisms and with air, avoiding dead zones and microorganisms sedimentation. This stage of wastewater treatment is ...