0000000000341394
AUTHOR
Andrejs Bērziņš
Interaction of Oily Water with Floating Porous Ceramic and Immobilized Microorganisms
Oily water was treated with porous ceramic granules and immobilized microorganisms. Floating granules with bulk density of 0.63-0.66 g cm-3were used. The sorption of motor oil was investigated for dry and wetted granules. Respiration experiments showed that microorganisms immobilized on floating ceramic carrier and treated with oily water were influenced by agitation of liquid. The treatment of oily water with low salinity (1-9 g L-1) showed that oil removal efficiency decreased after increasing water salinity. Likewise, oil removal efficiency decreased from 12 to 9% per gram of ceramic carrier after increasing the spill of oil from 9 to 35 g per square meter. Porous granules with immobiliz…
Politiskā līdzdalība, Latvijas gadījums, starptautiskie protesti
Pētnieciskā darba nosaukums ir: “Politiskā līdzdalība, Latvijas gadījums, starptautiskie protesti”. Pētījuma ietvaros izvirzītais mērķis ir sekojošs - izprast galvenos iemeslus, kāpēc cilvēki piedalās vai nepiedalās protestos. Darba izpētes jautājums tiek izvirzīts- kāpēc Latvijas iedzīvotāju līdzdalība starptautiskos protestos ir tik zema un kāpēc protesti uzrunā/neuzrunā iedzīvotājus. Bakalaura darba teorētiskās daļas pirmajā apakšnodaļā tika aplūkota protesta kā jēdziena definēšana un tā nozīme politikā, tostarp, kas veicina līdzdalību protestos un protestu ietekme. Pētnieciskā darba teorētiskās daļas otrajā apakšnodaļā tika apskatīti iemesli, kāpēc cilvēki nepiedalās protestos. Teorētis…
Evaluation of Glyphosate Ecotoxicity and Biodegradability in the Municipal Wastewaters
Glyphosate (G) is a broad-spectrum systemic organophosphate herbicide being widely used to control weeds in agricultural fields and urban areas. Its safety for both human health and aquatic biomes is a subject of wide debate. This study was aimed at evaluating the removal efficiency and ecotoxicity of G based herbicide (GBH) Klinik® (Nufarm, Austria) added to the raw municipal wastewater (WW) in a lab-scale model column system. The effect of oxide ceramics as a filtering medium (treatment „B”), as well as activated sludge and nutrients (treatment „C”) was compared with the control columns, which contained only WW (treatment „A”). After 72h treatment of WW spiked with 100 mg/L G, the lowest …
Selective enrichment of heterotrophic nitrifiers <em>Alcaligenaceae</em> and <em>Alcanivorax</em> spp. from industrial wastewaters
Removal of nitrogen from wastewaters (WW) represents a global problem. The low nitrification rate during WW treatment is often caused by ecotoxicity. This problem is attributed mostly to the industrial WW. Our study was focused on the testing of industrial WW and activated sludge (AS) with the aim to reveal the abundance of nitrifiers and increase their biomass, thus, providing the additional step, i.e., bioaugmentation, within the technological process of WW treatment. Plating of AS on the selective solidified media designated for the 1st and 2nd nitrification stages, resulted in the shift in bacterial community structure with dominated Alcaligenaceae and Alcanivorax for the 1st stage, and…