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Reed Bed Technology: a Review International Journal of Engineering Science Invention Research & Development; Vol. III, Issue IX, March 2017 www.ijesird.com, e-ISSN: 2349-6185 REED BED TECHNOLOGY: A REVIEW Kartikey Tiwari1, Shivendra Jha2, Kandarp Vyas3, Kavan Patel4, Mihir Patel5 1&2 Assistant professor, U.V.Patel Collage of Engineering, Ganpat University, Kherva 3 B.Tech Scholar Civil Engineering, U.V.Patel Collage of Engineering, Ganpat University, Kherva Abstract— This article gives you information about reed bed technology. Reed bed is natural purifying decentralized waste II. REED BED TECHNOLOGY water treatment. There is varies types of reed bed Horizontal flow and Vertical flow and use different types of macrophytes to A. TYPES OF REED BED treat waste water is also described in this method. Different type of aquatic plant spaces is used in this technology for treating Constructed wetlands are generally of two waste water. At last this article gives some guidelines for types as far as their water surface is concerned. construct reed bed technology. They are either of the free water surfaces (FWS) Keywords— Microphytes, Rhizosphere, Nitrification- type or of the submerged flow (SF) type and the Denitrification, Root-Zone direction of flow are either horizontal or vertical. Horizontal submerged flow type which is often I. INTRODUCTION preferred as it performs well, can be installed in According to centre pollution control board in relatively flat land and discourages the possibility 2009, class 1 and class 2 cities generated 38,254 of mosquito breeding that is likely with a free water million litters per day of waste water. Sewage surface. However, submerged flow wetlands are treatment plant had capacity of treat only 31 percent more expansive to construct because of the special of this waste water. According to approximation, gravel fill required and associated earthwork and treating just 1 MLD sewage costs around Rs 1 crore are likely to suffer from plugging with time. thought the centralised system, excluding the land Constructed wetlands of the vertical flow type are cost [5]. Reed bed technology is a good solution of preferred where an adequate slope is available to this India’s waste water problems. accommodate vertical flow without pumping. Such A reed bed is essentially a basin that is lined wetlands are also preferred for larger flows as they with sand, gravel and planted with macrophytes are reported to require less land area per person[4]. such as reeds. Reed bed waste water treatment systems are biological treatment that works by B. MACROPHYTES AND ITS ROLE combined action of bacteria and plants.Waste water Macrophytes play a major role in reed beds, passes through this basin where it undergoes influencing biological, chemical and physical treatment via physical, chemical and biological treatment processes. The most important function of interaction between the waste water, plant, macrophytes in reed beds has been categorized by microorganisms, gravel and atmosphere. This as physical and metabolic. Physical effects include: technology is also called as construction wetland or Filtration of suspended material, protection against root zone technology or Bio-filter. Reed bed erosion by reducing turbulence and flow velocities technology are example of non-mechanised stabilization of sediments and providing the surface treatment system which are easy to built and area for micro-organisms. Metabolic functions of operate and sustainable. macrophytes include nutrient uptake and O2 release Reed bed Technology is a highly effective from roots into the rhizosphere. Macrophytes have environmentally sustainable alternative to high adapted to anaerobic conditions by developing energy mechanical treatment systems, resulting in internal air spaces which transport O2 to the root dramatically lower operating costs and a reduced zone. These air spaces form an extensive system carbon footprint [3]. throughout the plant and can occupy 60% of the total tissue volume. Research differs on the potential for V. macrophytes to release O2 from roots to the surrounding rhizosphere thus providing Kartikey Tiwari, Shivendra Jha, Kandarp Vyas, Kavan Patel and Mihir Patel ijesird, Vol. III, Issue IX, March 2017/554 International Journal of Engineering Science Invention Research & Development; Vol. III, Issue IX, March 2017 www.ijesird.com, e-ISSN: 2349-6185 aerobic conditions for plant nitrification to occur. A 15 mm/day or 100 to 150 m3/ha-d). In the tropics, study by concluded that internal O2 movement not the rate could be higher and the outflow from the only supplied to buried plant tissues but also leaked bed would get reduced accordingly. One can also O2 into the rhizosphere. Macrophytes can also conceive of ‘zero’ discharge in a tropical area provide habitat for flora and fauna and increase through this is not the principal objective of a reed aesthetic appeal. Research differs on the bed. In moderate climates Europe, systems designed significance of plant uptake in nutrient removal at 8 m2 per population equivalent are reported to with nutrient loading is an important part in the produce almost no effluent during summer time[4]. proportion of nutrient removal by plant uptake [2]. D. REED BED TECHNOLOGY PROCESS C. AQUATIC PLANT SPECIES The Root Zone process functions according to The aquatic plant species cultivated should the laws of Nature, to effectively purify domestic preferably be one of the native plant specoes which and Industrial effluent. Root Zone encompasses the grows locally in that area. The selected species life interactions of various species of bacteria, the should have a relatively rapid growth rate, be roots of the reed plants, Soil, Air, Sun and of course tolerant rich feeds and be able to withstand water. Reed Plants have capacity to absorb oxygen wetlands conditions. Thus, one of the following from ambient air and creating numerous bacteria. species could be selected: Same bacteria oxidize and purify the waste water. 1. Phragmitesaustralis, Since the process occur underground inducing Phragmitescommunis, Phragmiteskarka different types of chemical reactions, the process 2. Typha spp.(Cattail) functions as a mirror of self regulating, purifying 3. Schoenoplectusvalidus (Great Bulrush) process found in nature. Three integrated 4. Juncusinges (Giant Rush) components are essential in this system. 1) The reeds In India, the Phragmitesspecies(locally called 2) The reed beds nanal in Tamil Nadu) have been reported to be 3) Microbial organisms. successfully used. They can grow to a height of 3-4 The process involves the raw effluent (after m at full growth. removing grit or floating material) which is passed All these aquatic plants have the horizontally or vertically through a bed of soil characteristic ability of transporting air (oxygen) having impervious bottom. The effluent percolates from the atmosphere to the roots from where a part through the bed that has all the roots of the wetland diffuses into the liquid substrate. They have plants spread very thickly. Nearly 2,500 types of relatively deep roots and rhizomes which create a bacteria and 10,000 types of fungi, which harbour large volume of active rhizosphere per unit surface around roots get oxygen from the weak membranes area. They supply oxygen to the micro-organisms in of the roots and aerobically oxidize the organic the substrate, and help stabilize the organic matter matter of the effluent. The characteristics of plants applied. The plants create oxidized micro- of absorbing oxygen through their leaves and organisms perform, stabilizing organic matter and passing it down to roots through their stems which promoting nitrification-denitrification also. are hollow, is utilized as a bio-pump. Anaerobic As the roots and rhizomes penetrate through digestion also takes place away from the roots. The the soil, they loosen the soil and improve filtering action of the soil bed, the action with fungi percolation, thus helping in stabilizing the hydraulic etc. and chemical action with certain existing or conductivity at a level reported to be resembling added inorganic chemicals help in finally obtaining coarse sand, within 2-5 years regardless of the very clear and clean water. The system of plants initial porosity of the soil. regenerates itself as the old plants die and form The reed beds also promote useful humus. Hence the system becomes evapotranspiration in the growing season (up to 10- Kartikey Tiwari, Shivendra Jha, Kandarp Vyas, Kavan Patel and Mihir Patel ijesird, Vol. III, Issue IX, March 2017/555 International Journal of Engineering Science Invention Research & Development; Vol. III, Issue IX, March 2017 www.ijesird.com, e-ISSN: 2349-6185 maintenance free and can run efficiently for several Size of the filter media should be 2-4 years [1]. cm. Effective grain size should be> .2 mm. • Different size of filter media in a E. GUIDELINES FOR REED BED TECHNOLOGY proportion of 1:3 should be used that will give an effective pore space of 30 1. Selection site:- per cent. • The selected site should not impair the drinking Water sources. 4. Depth and Dimension:- • The site must be safe from flooding. • For the dimensioning of the planted • The ground at the site should be flat and filter bed, two factored have to be at a lower level than the source of waste considered. water. 1. Volume of wastewater • If properly design and built, CW does 2. Organic load [5] not create any order or nuisance in the III. CONCLUSION vicinity. • It must be possible of the treated waste Reed bed technology is very efficient method water at the selected site as per the for treating decentralised waste water treatment for standards set by the concerned domestic waste water. It has been observed that In regulatory agency. India BOD removal efficiency in horizontal flow • The site should be accessible for varies from 80-96 per cent,TSS removals are better maintenance. than 75 per cent in most cases, In Pathogen and coliform almost 100% removal can be expect. Reed 2.Shape:- bed is treat water in natural manner not requirement • It is preferred to construct the CW of much money, not requirement of much energy, planted filter bed rectangular in shape not requirement of complicated set up.
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