Water is one of the most important and vital substance on earth. All life forms on earth require water to survive. If there will be no water there would be no life on earth. Aside from drinking water to survive, people have many other uses for water. An organism which does not require water is never discovered.
In recent years, various method such as nanofiltration [15, 16], capacitive deionization , electrodialysis , electrochemical treatment  and, adsorption [20, 21] have been widely studied for ions removal from aqueous solution, especially water softening. Several adsorbent are qualified for this purpose. Activated carbon is the most popular adsorbent which used for water softening but it cost remains its main drawback . A large number of low-cost adsorbents have been utilized for ions removal . Recently, natural clay minerals (e.g.
Water is very important to us because human bodies, as well as animals, cannot function without water in their systems. Water can no longer continue to stay unprotected, it is simply too important. Today most countries have laws aimed at safeguarding water quality and controlling water abstractions (Groenfeldt, 2013). In 2010, a new human right to ‘safe water and sanitation’ was recognized by the United Nations and implemented effective immediately. Water not only feeds the human body, but also the earth.
The importance of Water Water is the most basic need of everyone (human being, animal, plant and other microorganisms and water is the reason for our existence and further living things on the earth. Water is the unique source of life, without water we cannot imagine the life here. Without water there would be no local business or industry. Fire-fighting, municipal parks, and public swimming pools all need lots of water. An array of pipes, canals, and pumping stations managed by our public water systems are needed to bring a reliable supply of water to our taps each day.
Adsorption is one of the major process used for the removal of Cr(VI) worldwide because it is inexpensive, widely applicable, efficient and creates little amount of sludge(Kannan and Rengasamy, 2005). Chromium can be removed using adsorbents of natural as well as chemical origin. However, these bio-adsorbents have various disadvantages like waste may itself contain various toxicants and subsequently increase the organic content of water. Studies have showed adsorption capacities and applicability for some low-cost materials, among others like alluminium oxide, chitosan, bentonite, saw dust and waste slurry (Dubey and Gopal, 2007). Activated carbon is an effective inexpensive adsorbent which has use in various industries to purify water (D Mohan and Chander, 2001; Yoshihara et al.,2007; Yin et al., 2007).
Water is a blessing from God and an essential factor for much life on Earth. Based on scientific facts, we would not be alive without water. Water is something that should not be taken for granted because many people around the world still do not have access to water. Water is granted to those who praise God, but great power countries have the ability to give water out to everyone by using big companies that steal water from the land. This act of stealing water and selling it for profit allows water to be readily available to those who do not praise God.
Several recent publications were utilized for various inexpensive and locally abundantly available biosorbents like barley straw , peanut hulls , neem bark , waste tea leaves ,sago waste,hazel nut shell ,cocoa shells , tea waste , palm kernel fibre  and orange peels . Among these biosorbent, seaweeds are inexpensive and abundantly available. It is based on the submissive withholding of metal ions by functional groups and active sites present in the biomass [22-24]. It has numerous discrete advantages over other conventional techniques such as low-cost, eco-friendly, high efficiency, without additional nutrient supply, regeneration of biosorbent and feasibility of metal extraction etc.,
Chapter 1 Introduction 1.1 General The fresh water is very important for all humans, animals, and all living organisms. After the air, water is the most essential component on earth for the life. The main sources of water on earth are rivers, lakes, underground water, springs, glaciers etc. The total amount water is required for drinking is depends on the age of the humans, environmental conditions (eg. summer, winter), availability and quality of water etc.
I. INTRODUCTION Water is a basic need and essential for human needs. The clean water availability is a major concern in many developing countries including Indonesia (Song et al, 2009). Appan (1997), in a study stated that demand for clean water is needed in developing countries,. Sustainable water resources management should pay attention to the principle that the use of the water resources in accordance with the required quantity (Kim et al, 2007).
Water is the source of life. All living things most consist of water e.g. the water percentage in human body is over 60%.It helps body in various ways: a. To perform metabolic tasks b. To regulate temperature of the body c. To maintain other bodily function It is imperative to rehydrate body with the water because it keeps loses water through sweating, breathing etc.