greywater generation

View with images and charts Greywater Generation and Quality Measurement at a Specific Site In Dhaka City INTRODUCTION 1.1 General Background Water is a limited natural resource and fundamental for life and health. So we need to start thinking smarter about how we use it. We must think how to make sure our new or existing home uses water efficiently and cost effectively. With increasing pressures on water resources, the concept of beneficial use of treated wastewater has rapidly become an imperative for water agencies around the world. Water reclamation, recycling and reuse are now recognized as key components of water and wastewater management. Along with the technology advances in wastewater treatment, the opportunity for water reuse has never been more viable. The benefits of using recycled water include protection of water resources, prevention of coastal pollution, recovery of nutrients for agriculture, augmentation of river flow, savings in wastewater treatment, groundwater recharge, and sustainability of water resource management. However, given these benefits, water reuse should not be treated simply as a means to an end but should be implemented in conjunction with other water conservation measures. Here comes the question of which type of water is compatible to reuse. As long as the problem is about the scarcity of water and no new sources can be developed in our country without the traditional underground water, surface water and some other sources of potable water, the only choice remain is to reuse the household water, which in environmental science is named as ‘Greywater’. Any wash water that has been used in the home, except water from toilets, is called Greywater. The introduction of Greywater recycling will surely give a lasting impetus to economy and society alike. 1.2 Historical Background and present condition Today, when we enjoy the most incredible high-tech modern conveniences of the space research era like the mobile phone containing dozens of millions of transistors, enabling us even to watch TV, use the internet, e-mail, GPS, etc., some primitive problems remain stubbornly still with us, endangering our future. Such an unresolved case is the example of the flushing toilet for which we waist potable fresh water and this makes up about one third in household water consumption. To resolve this one and a half century-old problem a trivial and obvious solution has been found. Some thrifty and ingenious people mainly house wives collect the washing water with buckets and flush the toilet with that used washing water which is called grey-water. Storm and sanitary sewers were necessarily developed along with the growth of cities. By the 1840s the luxury of indoor plumbing, which mixes human waste with water and flushes it away, eliminated the need for cesspools. Odor was considered the big problem in waste disposal and to address it, sewage could be drained to a lagoon, or “settled” and the solids removed, to be disposed of separately. This process is now called “primary treatment” and the settled solids are called “sludge”. At the end of the 19th century, since primary treatment still left odor problems, it was discovered that bad odors could be prevented by introducing oxygen into the decomposing

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