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Patroescu V.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Patroescu V.,Polytechnic University of Bucharest | Ionescu I.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Ionescu I.,University of Bucharest | And 4 more authors.
Revista de Chimie | Year: 2016

A pilot scale biological aerated filter (BAF) was built in order to test the ammonium removal from a groundwater source intended for drinking water. Expanded clay granules were used as a filter media. In order to study the conversion rates of various ammonium loads, a pollutant present in groundwater, the upflow bioreactor was divided into three equal size sectors. The evolution of inorganic forms of nitrogen (NH4 +, NO2 -, NO3 -) concentration fronts along the height of the filter media and the ammonium removal rates were determined.


Ionescu I.A.,University of Bucharest | Ionescu I.A.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Patroescu V.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Patroescu V.,Polytechnic University of Bucharest | And 4 more authors.
Revista de Chimie | Year: 2016

Granular sludge technology represents a novel alternative to the conventional activated sludge wastewater treatment plants. Granules were cultured under aerobic conditions in a laboratory scale sequencing batch reactor (SBR). In order to enhance the growth of granular sludge, the SBR was operated with very short sedimentation and draw phases resulting in the washout of slow settling biomass and development of high density sludge granules (anaerobic feeding-45 min, aerobic reaction-11 h, settling-5 min and effluent withdrawal-10 min). The reactor was inoculated with conventional activated sludge, sampled from a wastewater treatment plant, and fed with dairy industry wastewater with high organic and nutrient load. Treatment performances increased along with the growth of granules size. Microscopic investigations were performed to assess the diversity and dynamics of the aerobic granular sludge biocenosis community and granules formation.


Constantin L.A.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Nitoi I.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Cristea I.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Oancea P.,University of Bucharest
Revista de Chimie | Year: 2016

Cytostatic drugs represents a categor y of pharmaceutical products used in cancer treatment, and among them 5-fluorouracil is the most common. Drugs used in cancer treatment are inhibiting and even destroying the cells, acting in a non-selective manner and therefore being considered to present carcinogenic, genotoxic, mutagenic and teratogenic potential. About 15% of the administered 5-fluorouracil is eliminated from human body without any transformation and therefore ends up in the wastewater system. Due to the fact that removal of 5-fluoruracil and other pharmaceutical products using conventional wastewater treatment is incomplete and inefficient, there is a need for more performant degradation technologies such as advanced oxidation processes. Among them, photocatalytic oxidation using titanium dioxide represents one of the most efficient removal technology for hazardous organic compounds. UV/TiO2 degradation of 5-fluorouracil was investigated in the aim to optimize process operational parameters: pH = 7, photocatalyst dose = 100 mg/L, irradiation time = 180 min. The degradation kinetic of 5-fluorouracil was found to follow Langmuir - Hinshelwood model and degradation rate constant kr=3.74 × 10-6 M min-1 and equilibrium constant of 5-fluorouracil adsorption on photocatalyst particles Kad = 9505 M-1 were determined.


Patroescu I.V.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Dinu L.R.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Constantin L.A.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Alexie M.,National Research and Development Institute for Industrial Ecology ECOIND Bucharest | Jinescu G.,Polytechnic University of Bucharest
Revista de Chimie | Year: 2016

The temperature influence upon the nitrification rate was studied using a continuous flow pilot installation, which comprises a biological aerated filter with ascendant inflow circulation. Used filter media was expanded clay, 2-5 mm granulometric fraction. The biofilter was fed with raw low - depth groundwater enriched with NH4 +. Inorganic nitrogen forms (NH4 +, NO2 -, NO3 -) concentrations were measured both within the inflow and outflow of aerated biological filter, at stationar y operation regimes in correspondence with various applied NH4 + loadings. Values of NH4 + removal rates were situated within the 515-1337 g NH4 +-N/m3day domain for temperature increase from 11 to 25.2 °C. The coefficients of reaction rate vs. reaction temperature equation were also determined.

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