Publication

Accumulation of toxic metals in aquatic plants

(National Research and Development Institute for Industrial Ecology, ECOIND , 2018)

;

;

;

;

11 152

Publication

Activated algae granulation: A biological solution for efficient microalgae harvesting

(2015)

Tiron, Olga

;

Bumbac, Costel

;

Patroescu, Viorel Ion

;

Stefanescu, Mihai

A novel biological method was developed as an alternative solution for the major drawback in developing the microalgae biotechnology for wastewater treatment at industrial scale: the microalgae harvesting step. The method allows efficient and fast harvesting of target microalgae cells (such as Chlorella sp.) and consists in the granulation of the photoautotrophic microalgae – bacteria biomass, in a stirred tank photo-bioreactor with specific operational conditions, using real wastewater as growth medium. Granulation process requires the presence of the filamentous microalgae which represent the base matrix of the biological structure. During the development of the granular entities, termed as activated algae granules, target microalgae cells are efficiently entrapped in the granular structure, thus almost complete microalgae biomass recovery (99.15–99.99%) is ensured by granules settling only. Moreover, high density of the biomass within the granule’s structure (with 80–300 ug dry weight/granule) and large granules’ size (500–3000 um) ensure a high settling velocity of the granules (18–29 m/h) which is higher with about 3–5 × 103 times than that of individual Chlorella sp. cells. Such performances prove the viability of the granular activated algae system by sustaining a cost saving microalgae harvesting strategy for the development of a new generation biotechnology for wastewater treatment.

4 286

Publication

Aerobic granular sludge in a sequencing batch reactor

(2015)

Ionescu, Ioana

;

Bumbac, Costel

;

Cornea, Petruta Calina

Granular sludge consist of bacterial aggregates that are much more compact than traditional activated sludge, thus offering numerous advantages such as high biomass retention, good settling ability and simultaneous removal of organic load and nutrients. In a laboratory scale sequencing batch reactor (SBR) granules were cultured under aerobic conditions. 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 (anaerobic feeding – 45 min, aerobic reaction – 11 h, settling – 5 min and effluent withdrawal – 10 min). The reactor was inoculated with conventional activated sludge and fed with dairy industry wastewater with high organic and nutrients load. The first aerobic granular structures, having 67–556 m in diameter, were observed after 5 days. After 25 days, they reached diameters between 513 m and 1276 m and increased gradually up to diameters of 2 mm by the end of the experiment. Treatment performances increased along with the growth of granules size.

4 203

Publication

Aerobic granular sludge – Microbial and morphological characterization

(2016)

Ionescu, Ioana

;

Bumbac, Costel

;

Nita-Lazar, Mihai

Biological wastewater treatment processes have a crucial importance to the modern world, due to the ever increasing need of sanitation and pollution control in urbanized areas. Aerobic granular sludge represents an alternative for the conventional biological system. Recent studies have greatly expanded the vision on aerobic granular sludge morpho-functional and microbiological peculiarities and their influence on wastewater treatment performance and behavior. The microbial composition of the granules obtained in a sequencing batch reactor – SBR, were characterized using microscopy and molecular biology techniques. Scanning electron microscopy investigations,revealed in sights into the granules morphology and structure: size, pore dimensions, presence of filamentous bacteria. Molecular biology techniques were used to determine the presence and abundance of biotechnologically useful bacteria (nitrifiers, denitrifiers) in the sludge granules samples. The samples were subjected to PCR amplification using the following primers: specific for ammonium oxidizing bacteria; specific for nitrite oxidizing bacteria; universal bacteria primers. The results indicated the presence of nitrifying bacteria specific genes belonging to Nitrosomonas sp., Nitrospira sp., and Nitrobacter sp., species responsible for nitrification. The abundance and diversity of identified microbial species were correlated with the treatment performances registered for the operational sequencing batch reactor.

3 257

Publication

Ammonia removal from aqueous systems by direct sonolysis and chlorination

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2019-09)

Stefanescu, Mihai

;

Badescu, Valeriu

;

Cristea, Ionut Nicolae

5 168

Publication

Assessment of operational parameters in the process of recovery and separation of pharmaceutical products through the technique of bulk liquid membranes

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2018)

Serban, Ecaterina Anca

;

;

;

;

;

Vasile, Gabriela Geanina

5 100

Publication

Biodiesel from edible oils: pro and cons

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2018)

Msheik, Malek

;

Cursaru, Diana-Luciana

4 114

Publication

Bioindicators in air quality control

(National Research and Development Institute for Industrial Ecology, ECOIND , 2018)

Cozea, Andreea

;

Bucur, Elena

;

Lehr, Carol Blaziu

;

Pascu, Luoana Florentina

;

Tanase, Gheorghita

5 132

Publication

Bisphenol a degradation via TiO2 assisted photocatalyse

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2018)

Constantin, Lucian Alexandru

;

Nitoi, Ines

;

Constantin, Mirela Alina

;

Cristea, Ionut Nicolae

;

Roger, Alex

3 95

Publication

Cellulosic material derived from maize stalk for Cu(II) and Fe(III) removal

(National Research and Development Institute for Industrial Ecology, ECOIND , 2019-09)

Marin, Nicoleta Mirela

;

Batrinescu, Gheorghe

;

Constantin, Lucian Alexandru

;

Dinu, Laurentiu Razvan

;

Catrina, Gina Alina

;

Nita-Lazar, Mihai

;

Pascu, Luoana Florentina

;

Lehr, Carol Blaziu

7 117

Publication

Characterization of the freshwater environmental status by a genomic approach

(2019-08)

Stoica, Catalina

;

Onciu, Teodora

;

Nita-Lazar, Mihai

9 91

Publication

Coagulation direct red dye and textile auxiliary agents in the presence of free formaldehyde

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2019-09)

Mocanu, Larisa

;

Gonta, Maria

12 206

Publication

Comparative evaluation of continuous and sequential batch reactor with aerobic granular sludge

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2018)

Manea, Elena Elisabeta

;

Bumbac, Costel

6 123

Publication

Concentration of collagen proteins by ultrafiltration compared to a standard protein (BSA)

(National Research and Development Institute for Industrial Ecology, ECOIND , 2019-09)

Scutariu, Roxana Elena

;

Batrinescu, Gheorghe

;

Nechifor, Gheorghe

;

Pirvu, Florinela

;

Constantin, Lucian Alexandru

;

Dolete, Georgiana

12 147

Publication

Conceptual model regarding the management of main flow waste in the context of circular economy

(National Research and Development Institute for Industrial Ecology, INCD-ECOIND , 2018)

;

;

;

;

Arama, Madalina Georgeta

9 161

Publication

Crude oil polluted soils phytoremediation with native grass

(2014)

Masu, Smaranda

;

Marin, Anca Andreea

;

Lixandru, Benoni

;

Popescu, Dumitru

;

Ciulan, Valentin

;

Morariu, Florica

;

Morariu, Sorin

Phytoremediation of soil contaminated with petroleum products is a technology that can restore of damaged soil. The use of recyclable materials such as stabilized municipal sludge stimulates the plant growth on crude oil polluted land is a simple joint sustainable waste management. Besides the nutrient deficient polluted soils, sewage sludge brings biocenosis to improve the destroyed soil bacterial community. To identify plant species that increase the degree of remediation of polluted soils with 6.4% total petroleum hydrocarbons two species of native wild plants Hordeum murinum and Cynodon dactylon have been investigated. Polluted soil treatment was performed with 25 t/ha stabilized sewage sludge in the absence/presence of 2 t/ha indigenous volcanic tuff. The implication of the finding of the vegetable cover studies is that 120 days growth of plants can lead to cleanup of crude oil polluted and fertilized soils and reduction of pollution level at 20 cm depth with 55% for Hordeum spp. and with 65% for Cynodon spp. Addition of tuff mixed with sewage sludge increased reduction of crude oil to 60% for Hordeum spp. and 76% for Cynodon spp. The tolerance and adaptability of plants in polluted soil makes each of these species a tool for the remediation-polluted soils.

13 173