Test measurements by Eötvös torsion balance and gravimeters

After more than 40 years of interruption new field observations have been made by an E-54 type torsion balance (TB)in the Csepel-island. These TB measurements were accompanied by a detailed gravimetric survey of each station with LCR gravimeters. Both vertical (VG) and horizontal (HG) gravity gradients were determined at each TB station for VG interpolation and reliability tests. Vertical gradient of gravity cannot be measured directly by the Eötvös TB. However, we successfully interpolated VG differences in the network of TB measurements following the idea originally due to Haalck. Reliability tests by comparing HG and VG gravimetric and TB measurements were also performed. Our recent paper discusses first results of these TB and gravimetric measurements which are scheduled to be continued in the future as well

Byproduct Formation of Chlorination and Chlorine Dioxide Oxidation in Drinking Water Treatment: Their Formation Mechanisms and Health Effects

Increasing water scarcity caused by population growth, climate change, pollution from natural and anthropogenic sources, etc. is likely to impact the occurrence of water-associated infectious diseases. Nowadays, access to clean and safe water is a growing concern worldwide. Therefore, disinfection of drinking water is a vital step in public treatment systems as it ensures the removal of various contaminants, including pathogenic microorganisms (protozoa, viruses, bacteria, and intestinal parasites) that give rise to waterborne diseases. Nevertheless, undesirable disinfection byproducts (DBPs) are formed during disinfection as a result of reactions between chemical disinfectants and natural organic matter (NOM), and/or anthropogenic contaminants, and/or bromide/iodide that are present in the raw water. The chemical complexity and heterogeneity of matters in the raw water makes the characterization and the mechanism of DBPs formation quite difficult and ambiguous regardless of the previous hundreds of studies on DBPs generation. As chlorination is still the most economic and most often used disinfection method, and beside chlorination, the application of chlorine dioxide is becoming more widespread, this paper investigates the possible DBPs generated using chlorine and chlorine dioxide with highlighting their adverse health effects. It overviews the reactions of those disinfectants with inorganic and organic compounds. It is important to note that in order to better understand the performance of disinfectants in water treatment, further investigations on the mechanisms of them with inorganic and organic compounds found in water are critically needed

Gazdaságos pénz-beosztó fűtésszabályzó

Az eddig megalkotott fűtésvezérlők szépen szabályoznak, pontosan tartva a helyiség hőmérsékletét, csak egy dolgot nem figyelnek, a pénztárcánkat. Mindenki szereti a meleg otthont, csak az anyagi lehetőségeiket nem veszik figyelembe és a hó végén ki nem fizetett számlák után a kikapcsolt közműszolgáltatás miatt várnak kínos hideg napok a „meleg” családi fészekre ami, ekkor már nem is olyan barátságos. Ezen segít a „pénz-beosztó” fűtésvezérlő. Mi is ez? Mennyiben más ez, mit az eddigiek? A fűtésre szánt pénzünket igyekszik beosztani helyettünk a lehető legjobban, figyelembe véve azokat a szempontokat, amiket megadunk. Egy biztos, nem lépi túl a beállított havi fűtési költséget. Eredmény: a havi fűtés költsége előre kiszámítható, és a lakásunk is elég meleg lesz ennek megfelelően. Még egy fontos szempont: ami gazdaságos az környezetkímélő is egyben

Optimization of Breakpoint Chlorination Technologies for Drinking Water Treatment: a Hungarian Case Study

Ammonium ion is one of the major pollutants found in drinking water sources in Hungary, especially in deep aquifers. under oxidative conditions, ammonium can transform into nitrite ions in the water system, posing potential health risks. In Hungary mostly biological process or breakpoint chlorination are used to eliminate ammonium ion from raw water during the drinking water treatment process. When breakpoint chlorination is applied, harmful by-products are formed. Trihalomethanes concentrations have long been regulated in Hungary, therefore during the design and optimization of the breakpoint technologies trihalomethane concentrations have been considered. However, haloacetic acids (HAA5) and chlorate ion have been recently regulated in accordance with EU Directive 2020/2184. Chlorate is a by-product that appears in treated water when sodium hypochlorite is used in breakpoint chlorination.Experiments were carried out at four Hungarian case study areas to determine the optimal strategy for breakpoint chlorination: applying higher chlorine dosages with lower contact times, or lower chlorine dosages with higher contact times. The investigations concluded that the preferable dosing strategy is to use lower chlorine concentrations and longer contact times. This approach reduces chemical demand (cost-effective) and has a neutral effect on THMs formation. it can be concluded that when the raw water contains ammonium ion concentrations above 0.5 mg/l, the use of sodium hypochlorite may raise concerns due to elevated chlorate ion levels in the treated water, particularly during summer. Further research is required to expand the optimization strategy, considering not only ammonium and trihalomethane concentrations but also chlorate concentrations

Editorial

EditorialEditoria

Hausübungen im Mathematikunterricht

Das dem Titel zu entnehmende System wird auf eine literarische Basis gestellt und ein subjektiver Kriterienkatalog entwickelt. Besonderes Augenmerk wird auf die Konformität mit dem Wortlaut des Gesetzgebers gewidmet

Mare Nostrum Interview: Jonathan Pugh

Interview with Prof. Jonathan Pugh.Interview with Prof. Jonathan Pugh.Interview with Prof. Jonathan Pugh