The use of reed beds for the treatment of sewage and wastewater.

The use of reed beds for the treatment of sewage and wastewater

1. Presentation Topics: The use of reed beds for the treatment of sewage and wastewater. Department of Textile Engineering

2. Department of Textile Engineering Submitted To: Submitted By Toriqul Islam 2016000400047 Dipto Kumar Das 2016000400072 Faisal Ahmed 2016000400074 Zahidul Hasan 2016000400093 Rajib Miah 2015000400069 Israt z ehrin Lecturer Dept. of Textile Engineering

3. Wastewater = Good Water + impurities What is wastewater? Wastewater   is any water that has been affected by human use. Wastewater is "used water from any combination of domestic, industrial, commercial or agricultural activities, surface runoff or storm water, and any sewer inflow or sewer infiltration

4. Anaerobic In absence of O2 Sensitive to toxics Aeration not needed Easy To Operate Lengthy startup periods, needs other treatments Septic tanks Biogas plants Anaerobic digesters Reed bed Treatment. Aerobic In presence of O2 Needs care to maintain O2 levels Aeration needed Energy intensive Less Stink But spreads aerosols Activated Sludge Trickling Filters RB Discs etc. Wastewater Treatment Technology

5. Techniques of wastewater treatment

6. Types of wastewater

7. Quality of wastewater

8. What is reed Bed System? Reed beds  are aquatic plant based   systems  which allow bacteria, fungi and algae to digest the sewage and clean the water. There are two basic types of reed bed  - vertical flow and horizontal flow - and the best  system  often results from combining the two

9. Salient Features of Reed Bed Systems No complicated setups No electricity wastage for aeration No costly imported equipment's No moving parts No need of highly trained manpower For operations and maintenance Operationally Simple Natural systems Power saving systems Easy to Operate and maintain Rejuvenates ecosystems

10. The Treatment Train Process

11. the wastewater stored in reed beds is treated and recycled. The reed bed filters the water just as the conventional biological filter bed systems of sewage treatment plants. Earlier reed bed sewage treatment systems used horizontal flow reed beds, where the liquid flows horizontally How Do Reed Beds Work?

12. Basic Reed Bed Design

13. Process of Reed Bed System?

14. How a Typical Reed Bed works

15. Reed bed life cycle stages E stablishment O peration , and B iosolid disposal – are shown below.  Final Biosolids have a dry solid content of 25–40%.

16. Application of Reed Bed System  Rural areas  Food processing industry  Breweries  Animal husbandry  Sewage from residential, institutional and industrial complexes.  Chemical industry

17. Types of Reed Bed There are three different types of systems that have been developed during the past 25 years for treating wastewater and sewage effluent . Horizontal flow reed-beds Vertical flow reed-beds Down-Flow Reed-beds

18. Horizontal Flow Reed-Beds Horizontal Flow systems only work when the effluent is of low strength.  They are not to be used to treat septic tank effluent, as this is too strong . They are also of no real use for reducing ammonia levels, but they can reduce the level of BOD (Biochemical Oxygen Demand) and SS (Suspended Solids) in sewage treatment plant effluent. Horizontal flow reed-beds should  only  be considered for tertiary treatment after a full sewage treatment plant.

19. Vertical flow reed-beds Vertical flow systems are more efficient than horizontal flow reed-beds and can handle stronger strength effluent. They can reduce ammonia as well as BOD and SS levels. It is usual for there to be two reed-beds installed, one after the other down the slope of the site. Vertical flow ones can be used to treat septic tank effluent.

20. Down-Flow Reed-beds Multi-stage reed-bed systems, incorporating two stages of vertical flow. They work on a 'fill and drain' system, where one bed fills over 12 hours whilst the other one drains and vice versa. The idea is that as the effluent drains out of the gravel, air is pulled in and helps to form an aerobic bacterial colony on the gravel surface to digest the pollutants. These systems invariably require the use of electric pumps, timers and control panels as the effluent is switched from one bed to the other every 12 hours. Down-flow reed-beds are normally used for treating septic tank effluent.

21. Factors influencing the purification process of reed bed treatment systems hydraulic loading rate (m³/[ha x d]) and hydraulic detention time(d ) temperature influent pollutant concentration oxygen supply development stage of the reed ecosystem

22. Reed Bed Sludge Treatment Systems

23. How well do I need to treat my wastewater How well you treat the wastewater is dependent on the method of disposal e.g. Sub-surface irrigation, ETA beds, mini trenches. Sub-surface irrigation systems require the highest level of treatment out of these three options. Manufacturers of sub-surface irrigation systems, such as ,, require that the wastewater is treated to a secondary level with BOD 20mg/L and TSS 30mg/L. A 7day residence time in the reed bed will produce a secondary treated effluent If you are installing an indexing valve and mini trenches or ETA beds it is not so important to achieve a 20/30 BOD/TSS if nutrient considerations have been met because the pipes used in the beds/trenches have larger holes to allow solids to pass through. Therefore, in general, reed beds used with sub-surface irrigation systems will be slightly larger, usually in order to allow BOD levels to drop.

24. Reed-Bed Life Span Reed beds are not a long term solution. They are a relatively new idea and even when they are designed and maintained properly, they will only be viable for up to a maximum of 7 to 10 years for reed beds that follow a full treatment plant as a final polishing filter only. Severn Trent Water, with over 300 installed, is currently having to start a refurbishment programme for reed beds which have been in use for a few years

25. Reference www.researchgate.net www.wte-ltd.co.uk info.cat.org.uk www.canberragarden.com www.researchgate.net www.poplarnetwork.com www.reedbedtechnology.com www.slideshare.net www.oceans-esu.com

26. Thank YOU