scholarly journals Rare Alkali Metals in the Waters of Lithium-containing Deposits in Eastern Transbaikalia

2022 ◽  
Vol 962 (1) ◽  
pp. 012001
Author(s):  
V A Abramova
Keyword(s):  
Drinking Water ◽  
Alkali Metals ◽  
Rare Metal ◽  
Water Bodies ◽  
Water Migration ◽  
Maximum Permissible Concentrations ◽  
Eastern Transbaikalia ◽  
High Concentrations

Abstract The results of hydrogeochemical studies on the content of rare alkaline elements in man-made waters of mining facilities at Zavitinskoye, Orlovskoye, and Etykinskoye rare metal deposits of Eastern Transbaikalia are presented. Concentrations of these elements are determined both by the content in the ores and rocks of deposits and by their water-migration properties. It was found that the acidic sub-basement waters of the Orlovskoye and the quarry waters of the Zavitinskoye deposits contain abnormally high concentrations of lithium, up to 3.74 and 3.88 mg / L, respectively. The high content of lithium (Li) in the waters of these deposits was determined relative to the average values for the waters of the hypergenesis zone, as well as the standards of maximum permissible concentrations (MPC) of chemicals for water bodies used for fisheries, drinking water, and other activities.

Performance Study of Some Reverse Osmosis Systems for Removal of Uranium and Total Dissolved Solids in Underground Waters of Punjab State, India

2014 ◽  
Vol 4 (2) ◽  
pp. 467-476
Author(s):  
Nisha Sharma ◽  
Jaspal Singh ◽  
Barjinder Kaur
Keyword(s):  
Drinking Water ◽  
Reverse Osmosis ◽  
State Government ◽  
Total Dissolved Solids ◽  
Internal Exposure ◽  
Drinking Water Source ◽  
Performance Study ◽  
Dissolved Solids ◽  
Underground Waters ◽  
High Concentrations

Radionuclides (uranium, thorium, radium, radon gas etc.) are found naturally in air, water, soil and rock. Everyday, we ingest and inhale these radionuclides through the air we breathe and through food and water we take. Out of the internal exposure via ingestion of radionuclides, water contributes the major portion. The natural radioactivity of water is due to the activity transfer from bed rock and soils. In our surveys carried out in the past few years, we have observed high concentrations of uranium and total dissolved solids (TDS) in drinking waters of some southern parts of Punjab State exceeding the safe limits recommended by national and international agencies. The main drinking water source is the underground water procured from different depths. Due to the highly saline taste, disorders in their digestive systems and other ailments, people are installing reverse osmosis (RO) systems in their houses. Some RO systems have been installed on commercial basis. The state government is also in the process of installing community RO systems at the village level. As high values of uranium are also undesired and may pose health hazards due to radioactivity and toxicity of uranium, we have conducted a survey in the field to study the performance of various RO systems for removal of uranium and TDS. Water samples from about forty RO systems from Faridkot, Mansa, Bathinda and Amritsar districts of Punjab State were collected and analyzed. Our results show that some RO systems are able to remove more than 99% of uranium in the underground waters used for drinking purposes. TDS values are also reduced considerably to the desired levels. So RO systems can be used to avoid the risk of unduly health problems posed by high concentrations of uranium and TDS in drinking water.

Bank filtration: a suitable process for the removal of iodinated X-ray contrast media?

2004 ◽  
Vol 50 (5) ◽  
pp. 261-268 ◽  
Author(s):  
S. Schittko ◽  
A. Putschew ◽  
M. Jekel
Keyword(s):  
Drinking Water ◽  
Contrast Media ◽  
Surface Waters ◽  
Sampling Period ◽  
Transformation Products ◽  
Bank Filtration ◽  
Anoxic Conditions ◽  
X Ray ◽  
High Concentrations ◽  
Media Concentration

After bank filtration, effluent influenced surface waters are often used as raw drinking water. It is known that high concentrations of iodinated X-ray contrast media are detectable in such surface waters and thus, more knowledge about the behaviour of the contrast media during bank filtration is necessary and the subject of investigations in this study. The adsorbable organic iodine (AOI), four widely used iodinated X-ray contrast media and four possible transformation products were quantified in an influenced lake, five groundwater wells and a drinking water well. Under anoxic conditions the AOI as well as the concentration of the contrast media are decreased by bank filtration, whereby the AOI is decreased by 64% and the contrast media concentration can be reduced up to 95%, depending on the compound. In the raw drinking water the following average concentrations were determined: Iopromid <20 ng/L, Diatrizote 166 ng/L, Iopamidol 166 ng/L and Iohexol 34 ng/L. Instationary conditions during the sampling period indicate that, at least under anoxic conditions, a large part of the contrast media and transformation products, which are still iodinated, may be associated to colloids and/or humic material.

scholarly journals THE PROBLEM OF “SALINE CONTAMINATION” OF NATURAL WATERS OF ROSTOV REGION, CONFINED TO THE IRRIGATED AREA

2021 ◽  
Author(s):  
T. I. Drovovozova ◽  
◽  
A. A. Kirilenko ◽  
Keyword(s):  
Natural Waters ◽  
Land Reclamation ◽  
Negative Impact ◽  
Water Bodies ◽  
Irrigated Agriculture ◽  
Drainage Systems ◽  
Small Water ◽  
Irrigation Period ◽  
Rostov Region ◽  
Maximum Permissible Concentrations

Purpose: analysis of problematic issues associated with the hydrochemistry of natural waters and the processes occurring in the irrigation systems of Rostov region. Discussion. The specificity of growing crops associated with irrigated agriculture has led to the formation of significant volumes of drainage and waste water (58676.5 thousand cub. m at the level of 2019). The quality of drainage wastewaters is determined by the hydrochemistry of groundwater and water intakes and has a seasonal character. In drainage systems operation of the Central irrigated zone, an unregulated inflow of salt-forming ions into water inlets was noted, and their concentration in the places where drainage wastes are discharged into small water bodies of the Lower Don (for example, Kostylevsky pr., Kolodezki ur., Solenaya river, erik Besheny) differs little from the background geochemical concentrations and corresponds to the natural saline background of the studied objects. Since irrigation and drainage systems are the objects of negative impact on the environment, uncontrolled natural processes of salt-forming ions migration in adjacent environments in combination with desalinization processes during the irrigation period led to violations of ecological legislation by the land reclamation and agricultural water supply departments in terms of exceeding the standards of maximum permissible concentrations for water bodies for fishery purposes, approved by the Order of the Ministry of Agriculture of 13.12.2016 no. 552. Conclusions. Regularities in formation of salt-forming ions migration processes in adjacent media have been revealed. It has been determined that one of the sources and agents of “saline contamination” of drainage and natural waters is groundwater. Hydrochemical materials and analysis of regulatory legal acts in terms of water bodies protection and use indicate the need to establish standards admitted to chemical substances concentrations disposal, taking into account the regional natural (nominally natural) hydrochemical background and natural and climatic characteristics differentiated for each small water body.

scholarly journals Arsenic Biotransformation as a Cancer Promoting Factor by Inducing DNA Damage and Disruption of Repair Mechanisms

2011 ◽  
Vol 2011 ◽  
pp. 1-11 ◽  
Author(s):  
Victor D. Martinez ◽  
Emily A. Vucic ◽  
Marta Adonis ◽  
Lionel Gil ◽  
Wan L. Lam
Keyword(s):  
Dna Damage ◽  
Drinking Water ◽  
Repair Process ◽  
Dna Methyltransferases ◽  
Health Concern ◽  
Dna Damage And Repair ◽  
Repair Mechanisms ◽  
Contaminated Drinking Water ◽  
High Concentrations ◽  
Epigenetic Patterns

Chronic exposure to arsenic in drinking water poses a major global health concern. Populations exposed to high concentrations of arsenic-contaminated drinking water suffer serious health consequences, including alarming cancer incidence and death rates. Arsenic is biotransformed through sequential addition of methyl groups, acquired from s-adenosylmethionine (SAM). Metabolism of arsenic generates a variety of genotoxic and cytotoxic species, damaging DNA directly and indirectly, through the generation of reactive oxidative species and induction of DNA adducts, strand breaks and cross links, and inhibition of the DNA repair process itself. Since SAM is the methyl group donor used by DNA methyltransferases to maintain normal epigenetic patterns in all human cells, arsenic is also postulated to affect maintenance of normal DNA methylation patterns, chromatin structure, and genomic stability. The biological processes underlying the cancer promoting factors of arsenic metabolism, related to DNA damage and repair, will be discussed here.

Mitigation of Endemic Arsenocosis with Selenium: An Example from China

2003 ◽  
Author(s):  
Wang Wuyi ◽  
Yang Linsheng
Keyword(s):  
Drinking Water ◽  
Control Group ◽  
Lung Cancers ◽  
Clinical Criteria ◽  
Contaminated Food ◽  
Smoke Pollution ◽  
Efficient Measurement ◽  
Chronic Arsenic Poisoning ◽  
High Concentrations ◽  
And Control

Endemic arsenocosis (chronic arsenic poisoning) in China comes from two sources of arsenic (As). One source is drinking water, with As concentrations 2-40 times that of the state standard of 0.05 mg/l As. The second is smoke pollution from combustion of coal with high concentrations of As; this can be inhaled or ingested from smoke-contaminated food. Over 2,000,000 people live in areas of high geological As concentrations (Cao 1996), and more than 17,000 arsenocosis patients in 21 counties of five provinces or Autonomous Regions have been identified. Long-term exposure to As in air, diet, or drinking water can result in permanent and severe damage to health, including lesions of the skin, mucous membranes of the digestive, respiratory, circulatory, and nervous systems, and rhagades (skin cleft on palm and feet). Elevated As intake is also associated with skin, liver, and lung cancers (Centeno 2000, Liang 1999, Wang Lianfang 54-61 1997). At present, there are few studies of efficient measurement of treatment of endemic arsenocosis patients. Our study demonstrates that treatment of these patients with dietary selenium (Se) can cause both excretion (elimination) of As accumulated in the human body and remediation of some health damages. We report the results of this experiment. Data were collected on 3 test groups of people: 186 patients, from BaYinMaoDao Farm in Inner Mongolia suffering from endemic arsenocosis, were divided into a treatment group (100 patients) and a control group (86 patients). A third group, consisting of 70 families, received no treatment but drank ambient well water, >0.10 mg/l As. All participants had been exposed to high-As drinking water (>0.10 mg/l) since 1983. Throughout the experiment, water containing 0.05 mg/1 As was supplied for both treatment and control groups. Of the 186 patients, 100 were treated with Se-enriched yeast tablets, containing 100 μg Se/tablet. The treatment lasted 14 months. Treated patients received 100-200 μg Se/day. All patients were examined for clinical criteria of arsenocosis: characteristic pigmentation, depigmentation, hyperkeratosis, rhagades (skin cleft), and incidence of secondary symptoms of headaches, dizziness, thoracalgia (chest pain), numbness of hands or feet, convulsions, or lumbago.

scholarly journals Family correlations of arsenic methylation patterns in children and parents exposed to high concentrations of arsenic in drinking water.

2002 ◽  
Vol 110 (7) ◽  
pp. 729-733 ◽  
Author(s):  
Joyce S Chung ◽  
David A Kalman ◽  
Lee E Moore ◽  
Michael J Kosnett ◽  
Alex P Arroyo ◽  
...  
Keyword(s):  
Drinking Water ◽  
Arsenic Methylation ◽  
Children And Parents ◽  
High Concentrations ◽  
Methylation Patterns

scholarly journals Quality of Drinking Water in the Balkhash District of Kazakhstan’s Almaty Region

Water ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 392 ◽  
Author(s):  
Sabir Nurtazin ◽  
Steven Pueppke ◽  
Temirkhan Ospan ◽  
Azamat Mukhitdinov ◽  
Timur Elebessov
Keyword(s):  
Drinking Water ◽  
Surface Water ◽  
Water Samples ◽  
Well Water ◽  
Chemical Impurities ◽  
Tube Wells ◽  
Local Residents ◽  
High Concentrations ◽  
Growth Economic

The thinly populated Balkhash District of Kazakhstan’s Almaty Region lies in the lower reaches of the Ili-Balkhash basin, which is shared by China and Kazakhstan. The district is arid and heavily dependent on inflows of surface water, which are threatened by the effects of upstream population growth, economic development, and climate change. The quality of drinking water from centralized water systems and tube wells in nine villages of the district was analyzed, and the organoleptic properties of water from these sources was also assessed by an expert and via surveys of local residents. Although most samples met governmental standards for the absence of chemical impurities, high concentrations of mineralization, chlorides, boron, iron, and/or uranium were present in some well water samples. Levels of these pollutants were as much as 4-fold higher than governmental maxima and as much as 16-fold higher than concentrations reported previously in surface water. All centralized water samples met standards for absence of microbial contamination, but total microbial counts in some well water samples exceeded standards. Organoleptic standards were met by all the water from five villages, but centralized water from one village and well water from four villages failed to meet standards based on expert judgment. Residents were, for the most part, more satisfied with centralized rather than well water, but there was no obvious relationship between the failure of water to meet standards and the locations or populations of the settlements. This is the first comprehensive assessment of groundwater used for drinking in the lower Ili-Balkhash basin, and although it relies on a limited number of samples, it nevertheless provides evidence of potentially serious groundwater contamination in the Balkhash District. It is thus imperative that additional and more detailed studies be undertaken.

Ecology of Australian Chats (Epthianura Gould): Aridity, Electrolytes and Water Economy.

1977 ◽  
Vol 25 (4) ◽  
pp. 673 ◽  
Author(s):  
CK Williams ◽  
AR Main
Keyword(s):  
Drinking Water ◽  
Arid Regions ◽  
Body Water ◽  
Seasonal Movements ◽  
Ambient Temperatures ◽  
Complex Interactions ◽  
Low Concentrations ◽  
Access To Water ◽  
High Concentrations ◽  
High Degree

The four species of Australian chats differentially occupy semiarid and arid regions where surface water commonly contains high concentrations of electrolytes, especially during the summer. The effects of variations in ambient temperature and salinity of drinking water on nutrition, water and electrolyte balances were compared between three species of chats in a split-plot, factorial design. The homeostatic responses revealed very complex interactions between thermoregulation, nutrition, and balances of electrolytes and water. All species have very low tolerance of electrolytes in the drinking water. Ingested electrolytes are not stored but are rapidly excreted in low concentrations at the expense of body water. Survival of chats in arid regions depends on a high degree of selectivity in avoiding water sources with even moderate concentrations of electrolytes. This avoidance is achieved by nomadism and seasonal movements to areas of recent rainfall, thereby increasing the access to water with low concentrations of electrolytes. The ability of the more xeric species to occupy regions of greater aridity cannot be explained by enhanced abilities to excrete electrolytes in high concentrations. The three species studied excrete electrolytes in similar, low concentrations. The more xeric species possess an advantage in water and electrolyte balances through lower evaporative losses of body water, especially at high ambient temperatures.

Development of a hybrid ozonation biofilm-membrane filatration process for the production of drinking water

2005 ◽  
Vol 51 (6-7) ◽  
pp. 241-248 ◽  
Author(s):  
T. Leiknes ◽  
M. Lazarova ◽  
H. Ødegaard
Keyword(s):  
Drinking Water ◽  
Organic Matter ◽  
High Speed ◽  
Membrane Surface ◽  
Drinking Water Treatment ◽  
Rotating Disk ◽  
Operating Conditions ◽  
Operating Modes ◽  
High Concentrations ◽  
Biomass Separation

Drinking water sources in Norway are characterized by high concentrations of natural organic matter (NOM), low alkalinity and low turbidity. The removal of NOM is therefore a general requirement in producing potable water. Drinking water treatment plants are commonly designed with coagulation direct filtration or NF spiral wound membrane processes. This study has investigated the feasibility and potential of a hybrid process combining ozonation and biofiltration with a rotating disk membrane for treating drinking water with high NOM concentrations. Ozonation will oxidize the NOM content removing colour and form biodegradable organic compounds, which can be removed in biological filters. A constructed water was used in this study which is representative of ozonated NOM-containing water. A rotating membrane disk bioreactor downstream the ozonation process was used to carry out both the biodegradation as well as biomass separation in the same reactor. Maintenance of biodegradation of the organic matter while controlling biofouling of the membrane and acceptable water production rates was the focus in the study. Three operating modes were investigated. Removal of the biodegradable organics was consistent throughout the study indicating that sufficient biomass was maintained in the reactor for all operating conditions tested. Biofouling control was not achieved through shear-induced cleaning by periodically rotating the membrane disks at high speed. By adding a small amount of sponges in the membrane chamber the biofouling could be controlled by mechanical cleaning of the membrane surface during disk rotation. The overall results indicate that the system can favorably be used in an ozonation/biofiltration process by carrying out both biodegradation as well as biomass separation in the same reactor.

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