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Fecal Sludge Management Sandec Training Tool 1.0 – Module 5 Faecal Sludge Management Eawag: Swiss Federal Institute of Aquatic Science and Technology Definitions & Objectives What is Faceal Sludge Management? (FSM)? ° Faecal Sludge Management deals with the management of sludges from on-site sanitation systems, while wastewater management deals with sewered sanitation. Faecal sludge may be treated in separate treatment works or co-treated with sludges produced in wastewater treatment plants. Sandec Training Tool 2 Definitions & Objectives Definitions ° Cesspit An enclosed container used for storing sewage. ° Combined Sewer A sewer system that is designed to carry both blackwater from homes and stormwater (rainfall). Combined sewers must be much larger than Separate Sewers to account for the high volume. ° Faecal Sludge Is the general term for the undigested or partially digested slurry or solid that results from the storage or treatment of blackwater or excreta ° Faeces Refers to (semi-solid) excrement without any urine or water ° Septage Liquid and solid material pumped from a septic tank, cesspool or other primary treatment source. ° Sewage General name given to the mixture of water and excreta (urine and faeces), although more technically it should be referred to as blackwater. ° Sewer An open channel or closed pipe used to conveying sewage ° Sewerage All the components of a system used for collecting, transporting and treating sewage (including pipes, pumps, tanks, etc.) ° Sludge The thick, viscous layer of materials that settles to the bottom of septic tanks, ponds, and other sewage systems. Sludge is comprised mostly of organics, but also sand, grit, metals, and various chemical compounds. ° Sullage Old word for greywater: includes wastewater from cooking, washing, and bathing, but does not include any excreta. Sandec Training Tool 3 Definitions & Objectives “On-site” vs. sewered FS management Sewered sanitation “On-site” sanitation Excreta Wastewater Effluent to Septic tanks Latrines treatment plant soakage, drains or sewers Sludge treatment Liquid to discharge into receiving waters Effluent to agricultural use or Biosolids to agriculture for soil discharged into receiving waters conditioning and fertilisation Sandec Training Tool 4 Introduction Which parameters are used to characterise FS? pH C/N TS Heavy metals EC Helminth eggs TVS FC (MPN) TKN AN BOD/COD Sandec Training Tool 5 Introduction What are the daily per capita quantities for FS? Parameter Septage 1 Public toilet Pit latrine sludge Fresh excreta sludge 1 2 BOD [g/cap·day] 1 16 8 45 TS [g/cap·day] 14 100 90 110 TKN [g/cap·day] 0.8 8 5 10 2 1.5 Volume (includes water 1 0.15 - 0-20 (faeces and [l/cap·day] for toilet urine) cleansing) 1 Estimates are based on a faecal sludge collection survey conducted in Accra, Ghana. 2 Figures have been estimated on an assumed decomposition process occurring in pit latrines. According to the frequently observed practice, only the top portions of pit latrines (~ 0.7 ... 1 m) are presumed to be removed by the suction tankers since the lower portions have often solidified to an extent which does not allow vacuum emptying. Hence, both per capita volumes and characteristics will range higher than in the material which has undergone more extensive decomposition. Sandec Training Tool 6 Systems & Technologies What influences the character of Faecal Sludge? Tank emptying technology + pattern Storage duration (months to years) Performance of septic tank Faecal sludge is a highly concentrated and variable material. Treatment system shouldQuality be of designedFaecal Sludge on a case-to-case basis. Admixtures to FS (e.g grease, kitchen / solid waste) Intrusion of groundwater Temperature Sandec Training Tool 7 Systems and Technologies What are the processing steps (functional groups) and technologies in sanitation? Collection (Semi-) and Storage/ Centralised Use and/or User Interface Treatment Conveyance Treatment Disposal • Dry Toilet • Single Pit • Human-Powered • Anaerobic • Application of • Urine Diverting • Single VIP Emptying and Baffled Reactor Urine Transport Dry Toilet • Dehydration • Anaerobic Filter • Application of • Urinal Vaults • Motorized • Trickling Filter Dehydr. Faeces Emptying • Compost • Pour-Flush Toilet • Septic Tank and Transport • Waste Stabilisation • Irrigation • Flush Toilet • Composting • Simplified Sewers Chamber Ponds • Aquaculture • Urine Diverting • Small-Bore Sewer Flush Toilet • Anaerobic • Activated Sludge • Soak Pit • Conventional Baffled Reactor • Constructed • Leach Field Gravity Sewer Wetland • Anaerobic Filter • Land Application • Jerry Can/Tank • Co-composting etc. • Surface Disposal etc. etc. etc. Only selected combinations of technologies will lead to functional systems. Sandec Training Tool 8 Systems & Technologies What are the process steps in FS management? Collection (Semi-) and Storage/ Centralised Use and/or User Interface Treatment Conveyance Treatment Disposal Emptying / Haulage Reuse / Treatment Storage Sandec Training Tool 9 Systems & Technologies What are the major technologies for solid-liquid separation and FS treatment? Solid-liquid separation Secondary treatment Sandec Training Tool 10 Co-composting Municipal solid waste Mixing ratio: Faecal sludge 1:2 to 1:10 Thermophilic Co-composting valuable soil 50-60 °C is conditioner- effective for cum-fertilizer pathogen destruction Safe reuse in agric. 90 days is long enough for the inactivation of all helminth eggs. Sandec Training Tool 11 Systems & Technologies Planted drying bed Operation 2 Land requirement: Application rate: up to 250 kg/m /year ~ 0.03 m 2/cap Application frequency: 1-2/week Desludging period: 2-3 years Vegetation cattails, reeds or bulrushes (~ 8 shoots/m2) Filter bed Large gravel (d=20mm): 25 cm Underdrain Fine gravel (d=5mm): 25 cm Hollow concrete blocks Sand: 10 cm Perforated PVC pipes Percolate and biosolids usually need further treatment Depends on sludge contamination and local discharge regulationsSandec Training Tool 12 Systems & Technologies Unplanted drying bed Sludge application depth: ~25-30 cm TS loading: ~100-200 kg TS/m 2*a Percolate quantity: ~50-80% of FS volume Drying period to attain 40% solids content: ~8-12 days (dry weather) Land requirement: ~ 0.05 m 2/cap (assuming a 10-day cycle) Both, percolate and biosolid need further treatment ! Sandec Training Tool 13 Systems & Technologies Settling/thickening tanks ° Settling/thickening units operated alternatively (e.g. 4 weeks loading / 4 weeks drying) ° Performance of the tanks strongly depends on the plants state of maintenance and operation ° Problem when treating fresh public toilet sludges: bad settling behavior! Sandec Training Tool 14 Systems & Technologies Comparison of sedimentation/settling ponds vs. settling tanks Faecal sludge Sedimentation ponds: 8-12 month loading / resting cycles (e.g. with in- pond drying of solids) Settling tanks: 2-4 month loading / resting cycles (separated solids e.g. To sludge drying beds or co-composting) Characterization Settling- Settling ponds thickening tanks Suspended solids (SS) 60% > 95% BOD and COD (unfiltered) 3 –50% 70–95% BOD (filtered) 18% 45% Sandec Training Tool 15 Systems & Technologies Anaerobic digestion + Biogas extraction energy production, light, cooking - Mechanization level higher than for e.g. pond systems - Higher operation and maintenance requirement Sandec Training Tool 16 Systems & Technologies Anaerobic vs. Aerobic digestion •Reduced BOD, COD - •CO 2, H 2O, NO 3 , SO 2-, PO 3- Aerobic 4 4 Organic Material Influent (high BOD,COD) Anaerobic •Dissolved BOD, COD + •CO 2, CH 4, N 2, NH 4 , 3- •H2S, PO 4 Aerobic Anaerobic Example of Application Trickling Filters, Oxidation Anaerobic Reactor Ponds Carbon Balance 50% CO 2 95% CH 4+CO 2 (=Biogas) 50% Biomass 5% Biomass Energy Balance 60% Biomass 90% Retained in CH 4 40% Heat production 5% Biomass 5% Heat production Biomass Production Fast Slow Sandec Training Tool 17 Systems & Technologies Waste stabilisation ponds FS is usually pre-treated for solids-liquid separation (e.g. in ponds or tanks) Biosolids have to be treated to satisfy safe Effluent use in agriculture hygienic standards but can be reused as soil is not possible due to its conditioner in agriculture high salinity. Sandec Training Tool 18 Systems & Technologies FS co-treatment with wastewater Problems with Waste-Stabilization Ponds: Variable Effects and expected problems SS - Sludge settling and consolidation More frequent solids removal and handling Short-circuiting of flow NH4 / NH3 - Ammonia toxicity due to high concentration in undigested FS. Inhibition to the development of facultative and maturation pond conditions - Eye irritation Colouration - Dark colour of FS supernatants prevents light penetration Algal growth and hence facultative or maturation pond conditions may not evolve Sandec Training Tool 19 Co-treatment of FS and Wastewater in Activated Sludge Plants Sandec Training Tool 20 Sandec Training Tool 20 Co-treatment of FS and Wastewater in Activated Sludge Plants Primary Treatment Process According to ATV (1985), two conditions must be met if FS is to be co-treated with wastewater: • FS should be diluted with the wastewater at least 20 times. •The capacity of a sewage treatment plant should be designed for at least 600 kg BOD/d to avoid unstable treatment performance Activated Sludge Process The following impacts have been observed and reported in treatment plants overloaded with faecal sludge: •Decrease in O2 content in aeration units •Odour and foaming problems in aeration units
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