It is easy for the importance of groundwater in water supplies to be underestimated. Ppt groundwater powerpoint presentation free to download. Ppt groundwater pollution powerpoint presentation free. But this is very difficult, as millions of rural families in india depend on groundwater for sustaining irrigated agriculture and livelihoods. Pumpandtreat pumpandtreat is a primary technique for groundwater and soil remediation. Groundwater contamination, protection and remediation eolss. Materials from the lands surface can move through the soil and end up in the groundwater. Probably the greatest threat is exposure to undetected contamination. Talabi and others published groundwater pollution and remediation find, read and cite all the research you need on researchgate. Cartoon on the main contamination sources and water paths through the soil and the watertable aquifer, in an area with rural, industrial and urban influence.
Geochemical signatures of groundwater along mountain front and riparian zone of courtallam, tamil nadu. Many commercial businesses and industries in virginia also depend on groundwater for their processes and operations. The importance of groundwater in addition to rural households and public water supplies that depend on wells and groundwater, farmers too use groundwater for irrigating crops and for their animals. Aug 28, 2018 as a result, groundwater prevents them from drying up.
Zhang encyclopedia of life support systems eolss contamination. Groundwater quality and protection defining strategies and setting priorities who should promote groundwater pollution protection. Ozunu 7, carried out work on quality of ground water by w. If so, share your ppt presentation slides online with. The dominant role of groundwater resources is clear and their use and protection is, therefore, of fundamental importance to human life and economic activity. Similarly, the contamination of groundwater with mercury can result in cancer and other dangerous diseases. About 200,000 shallow tubewells are installed in the 20 districts that comprise the terai region serving about 11 million people.
Arsenic contamination in groundwater from the padmameghna plain was first reported in 1995 19,20. Most groundwater contamination originates at the land surface and is classified as either point source, for example from spills or an industrial site, or nonpoint source, for example from agriculturerelated compounds. But, natural and humaninduced chemicals can be found in groundwater. Ii remediation techniques for soil and groundwater x. Applied hydrogeology are the old and new testament of groundwater hydrology dingman has a good groundwater. Groundwater pollution is the property of its rightful owner. Groundwater will normally look clear and clean because the ground naturally filters out particulate matter. Landfills solid waste is disposed of in thousands of municipal and industrial landfills throughout the country. When ground water becomes contaminated, it is difficult and expensive to clean up. In addition, the disposal of many household wastes is not regulated. Environmental pollution can be defined as a change that is not wished or desired in the chemical, physical, or biological characteristics of any component of the environment air, water, and soil which can cause harmful effects on various or many forms of life. In a preliminary study, we analyzed 52,000 tubewell.
Arsenic poisoning can lead to skin diseases, gastrointestinal problems, and even cancer. Some of the most important processes affecting hazardous substances in groundwater are advection, sorption, and biological degradation. This groundwater pfas sampling guidance discusses the collection of groundwater samples and methods to prevent crosscontamination that can occur from. In the zone of saturation all interstices are filled with water, under hydrostatic pressure. It is customary to think of groundwater as being more important in arid or semiarid areas. Scribd is the worlds largest social reading and publishing site. Once contamination starts, very little can be done to check it except a total ban on pumping. Pollution is of different kinds depending on the nature of pollutants and pollutions.
The importance of groundwater d longwood university. Groundwater cleanup, or remediation, is one of the most difficult. For a long time, groundwater was known to be clean and free from contamination. Introduction to groundwater hydrology ye zhang dept.
Models are a simplification of reality to investigate certain phenomena or to predict future behaviour. Groundwater contamination an overview sciencedirect topics. Groundwater pollution or groundwater contamination is defined as an undesirable change in groundwater quality resulting from human activities for more information on nonpoint source pollution from agricultural activities, see nonpoint sources of pollution in irrigated agriculture uc anr publication 8055. According to barker, 1990 chargeability will increase as salinity of the groundwater increases up to 500 mgl. The designations employed and the presentation of material throughout the. Water pollution is the impure or unclean state of all water bodies like lakes, rivers, groundwater. Examples of inoc package items that were not prepared correctly. It can also occur naturally due to the presence of a minor and unwanted constituent, contaminant or impurity in the groundwater, in which case it is more likely referred to as contamination. Contamination pollution signifies any degradation of natural ground water quality while contamination is reserved for pollution that constitutes a hazard to human health 4.
Thus, it appears that there is a correlation between the increased chargeability, towards the well and increased ion concentration as a result of leachate contamination at these depths. Introduction this document has been prepared with the intent of assisting the public and state agency staff with the regulatory expectations associated with soil and groundwater contamination incidents under the current purview of the deq division of water resources dwr. Water pollution power point presentation at present, water scarcity is a global difficulty in a world because many countries are suffering from this difficulty as many freshwater bodies, oceans and seas are polluted by humankind. Groundwater is a critical natural resource that can be degraded by contamination. Therefore, there is a high potential of false positives if proper procedures are not followed during sample collection.
It also sustains the ecosystem by providing water for the vegetation when rainwater has dried up. Nov 09, 2018 the contamination of groundwater affects the quality of drinking water in places dependent on groundwater for consumption. Energy can be transported in a stream of energetic particles or in the form of radiations i. Groundwater pollution also called groundwater contamination occurs when pollutants are. Groundwater contamination occurs when manmade products such as gasoline, oil, road salts and chemicals get into the groundwater and cause it to become unsafe and unfit for human use.
Groundwater is the major drinking water source for the terai population of southern nepal where 47% of total population of 23 million people lives. This type of water pollution can also occur naturally due to the presence of a minor and unwanted constituent, contaminant or impurity in the groundwater, in which case it is more likely referred to as contamination rather than pollution. Many processes can affect how contamination spreads and what happens to it in the groundwater, potentially making the contaminant more or less harmful, or toxic. Groundwater contaminants and sources uc davis groundwater. Integrated modelling for groundwater contamination from polluted. Keywords groundwater, contamination, remediation, pumpandtreat, air sparging, flushing, permeable reactive barriers 12. The zone of aeration consists of interstices occupied partially by water and partially by air. The guideline is aimed at professionals as a manual or reference material for. The energetic particles can be neutral or they can be electrically charged.
Trends in groundwater pollution groundwater governance. Nov 08, 2016 groundwater pollution also called groundwater contamination occurs when pollutants are released to the ground and make their way down into groundwater. The subsurface occurrence of groundwater may be divided into zones of aeration and saturation. However, groundwater contains dissolved materials that can be toxic as, hg, pb or nontoxic but unpleasant lime, sulfur, salt, fe. Hydraulic fracturing can potentially contaminate drinking water sources pdf. Find materials for this course in the pages linked along the left. Groundwater pollution also called groundwater contamination occurs when pollutants are released to the ground and make their way down into groundwater. To begin to address pollution prevention or reme diation, we must understand. Groundwater modelling is an efficient tool for groundwater management and remediation. Using epas pfoa and pfos lifetime drinking water health advisory level of 70 ppt as the preliminary remediation goal prg for contaminated groundwater that is a current or potential source of drinking water, where no state or tribal mcl or other applicable or relevant and. During 1998, 41 of the 64 districts in bangladesh were identified as having concentrations of arsenic in groundwater exceeding 50 gl 21. Pollution of ground water defined as the artificially induced degradation of natural groundwater quality pollution can impair the use of water and can create hazards to public health through toxicity or the spread of disease. As a result the commission revised the groundwater. Wildlife can also be harmed by contaminated groundwater.
What are the major sources of groundwater contamination. Carlos abad, stefan florek, helmut beckerross, maodong huang, hansjoachim heinrich, sebastian recknagel, jochen vogl, norbert jakubowski, ulrich panne. Groundwater free download as powerpoint presentation. Field clothing and personal protective equipment ppe. A free powerpoint ppt presentation displayed as a flash slide show on id. Chemicals that should be disposed of in hazardous waste landfills sometimes end up in municipal landfills. Chapter 12 physical and chemical groundwater remediation. Groundwater contamination most often occurs due to geohydro chemical processes activated by pumping. Other long term effects such as certain types of cancer may also result from exposure to polluted water. Energy traveling through space is called as radiation.