DEWATS | DecentralizedDecentralized Wastewater Treatment Solutions Wastewater Treatment Solutions Demand-based technical solutions to reduce water- pollution by small and medium enterprises and settlements in densely populated areas Treatment Systems | DEWATS Service Package Developed and disseminated by BORDA & BORDA BNS Network
About DEWATS The Challenge DEWATS stands for “Decentra- • DEWATS applications provide are combined according to demand: The demand for reliable, efficient lized Wastewater Treatment treatment for both, domestic and • Primary treatment: sedimentati- and low-cost wastewater treatment Common Wastewater Problems Solutions”. DEWATS is rather a industrial sources on and floatation systems is increasing world wide within Small and Medium Enterprises technical approach than merely • DEWATS applications provide • Secondary anaerobic treatment especially in densely populated a technology package. treatment for organic waste- in fixed-bed reactors: baffled urban regions where adequate water flows from 1-1000 m3 upstream reactors or anaerobic wastewater treatment systems do DEWATS applications are based on per day filters not exist and uncontrolled discharge the principle of low-maintenance • DEWATS applications are reliable, • Tertiary aerobic treatment of wastewater endangers environ- since most important parts of the long lasting and tolerant towards in sub-surface flow filters mental health and water resources. system work without technical ener- inflow fluctuation • Tertiary aerobic treatment Many Governments have passed Many SME are not able to pay high gy inputs and cannot be switched off • DEWATS applications do not need in polishing ponds new environmental regulations sti- investment and maintenance costs intentionally. sophisticated maintenance DEWATS applications are designed pulating that dischargers of waste- required for sophisticated waste- DEWATS applications provide state- Without considering facilities for ne- and dimensioned in such a way that water such as small and medium water treatment system. of-the-art-technology at affordable cessary chemical pre-treatment of treated water meets requirements enterprises and housing estates will prices because all of the materials wastewater from industries, DEWATS stipulated in environmental laws and be held responsible for wastewater used for construction are locally applications are based on four basic regulations. pollution and must therefore treat available. technical treatment modules which wastewater adequately on-site before it is discharged into the en- vironment. Appropriate Wastewater Treatment for SMEs Maintenance of sophisticated wastewater treatment systems Advantages of DEWATS technology Hence require high-skilled personnel. • Providing treatment for domestic and industrial wastewater DEWATS technology is an effec- • Low primary investment costs as no imports are needed tive, efficient and affordable • Efficient treatment or daily wastewater flows up to 1000m3 wastewater treatment solution • Modular design of all components for small and medium sized • Tolerant towards inflow fluctuations enterprises (SME). • Reliable and long-lasting construction design Due to lack of investment capital • Expensive and sophisticated maintenance not required and technical knowledge SME • Low maintenance costs often adapt non-effective low-cost „solutions“. Wastewater discharged by SME1 2 often does not meet environmental standards. Main DEWATS-modules for phy- sical and biological wastewater treatment: 1. Settler 2. Anaerobic Bafﬂed Reactor 3. Anaerobic Filter 4. Planted Gravel Filter3 4
Demand DisseminationFor many small and medium enter- For these potential clients, BORDA systems, project planning, imple- To assure sustainable dissemination Project planning Quality Controlprises and housing estates, con- and its network of partner organi- mentation and quality control has of appropriate wastewater treatment Project planning includes technical All DEWATS systems constructedventional wastewater treatment sations started in 1994 to develop resulted in a significant increase of infrastructure in the long-term, a feasibility studies, detailed enginee- are designed and have a guaranteesystems are technically sophisticated reliable and cost-efficient waste- implementation capacity and disse- mere focus on technical aspects has ring designs and cost-estimates. to fullfill specified discharge stan-and costly, often require high energy water treatment systems which mination of technical know-how. proven insufficient. dards. Effluent tests are conductedinputs for operation and rely on could efficiently treat non-toxic The approach for implementation Project implementation at regular intervals.sophisticated maintenance services organic wastewater according to Today, more than 1000 stakeholders of DEWATS projects includes not Service provision depends on prefe-to ensure continuous operation. legal environmental standards. from the private sector, govern- simply the construction of hardware rences of clients and network-part- Research & DevelopmentIn most cases, such requirements Successful efforts to standardize ments and NGOs have been but a whole comprehensive set of ners and may include supervision of Continuous efforts are made byare unsuitable for SME. main components of the DEWATS trained by the BORDA-Network to integrated measures such as: construction, contractor services or members of the DEWATS partner- approach, such as multi-stakeholder facilitate dissemination, implemen- turn-key operation. To ensure high network to improve efficiency and approach, modular design of tation and maintenance of DEWATS Information seminars and quality standards, major tasks are effectiveness of treatment systems. workshops to introduce DEWATS always carried out by qualified ex- to key-stakeholders perts. Early information of key-stakehol- ders is vital to ensure continuous Technical support and monitoring support for programme on macro- Staff responsible for operation and level. maintenance of DEWATS plants are adequately trained by technical ex- Co-financing of perts during the first year of opera- demonstration projects tion. Financial support during the start- Dome shaped anaerobic bafﬂed reactor for biogas recovery up phase of a demonstration pro- ject enhances the achievement of desired results and impacts. Sector specific information-seminars An early focus on specific priority- sectors supports an exchange of ideas between experts and potential clients that have similar professio- nal experiences. Technical training Long-term DEWATS experts facili- DEWATS ensures state of the art system resulting in the sustainable tate comprehensive training pro- treatment results at affordable cost, low maintenance and limi- operation of more than 250 grammes for qualified staff of part- ted space requirements DEWATS plants. The success of ner organisations and take on DEWATS has fostered cooperations a supervisory role during first tech- with numerous government depart- nical implementations. ments, municipalities and inter- national donor agencies to increase capacities and technical implemen- tations.
Good PracticesDEWATS for Hospitals DEWATS for CommunitiesCharacteristics: Technical Solution: Characteristics:• 250 beds with outpatient • Treatment system for 150 m3 • Open waste water lagoon within • Fully mixed digester department wastewater/day community (fixed-dome biogas plant)• untreated wastewater discharge • Sedimentation + anaerobic filter • 6 public toilets/6 bathrooms • Baffled reactor into nearby stream + horizontal sandfilter + puri- for 500 people • Landscaping• complaints of neighboring fication pond • Unwillingness of landlords to • rehabilitation of WW ditches communities • Pumping chamber after upgrade sanitation infrastructure • MOU between NGO and• limited funds anaerobic filter • Willingness to provide lagoon space CBO regarding maintenance• limited technical skills of staff • Total construction cost: • Willingness of people to pay of Sanitation/DEWATS infra-• sufficient space $ 50.0000 for use of proper sanitation structure • Training of maintenance staff infrastructure and 1 year guarantee • People willing to manage sani- tation infrastructure Technical Solution:DEWATS for Agroindustries Laboratory Test ResultsCharacteristics: Technical Solution:• More than 100 cattle slaughtered Separation of wastewater per day components:• Extreme fluctuation of waste • De-watering, sedimentation DEWATS Treatment Efficiency water composition & floatation• extremely high organic load Treatment system components: No Para- Unit Anlytical-Results Reduction• limited space for construction • Screening meter Inlet Outlet [%] near stream • Sedimentation• unreliable responsibility and • Composting 1 Temp. °C 27 27 – maintenance • fully-mixed digestion in biogas 2 pH – 7,6 7,3 4% reactor 3 BOD 5 mg/l 290 53,6 83 % • Anaerobic filter 4 COD mg/l 590 84 86 % 5 Phosphate mg/l 18,33 3,67 80 % 6 TSS mg/l 172 84 51 % Effluent Quality during first months of DEWATS operation 7 Ammonia mg/l 0,19 0,07 63 % Source: Graha Asih Hospital Bali, Anaerobic Filter + Horizontal Sandﬁlter + Puriﬁcation Pond
Benefits of DEWATS• Establishing of multi-stakeholder networks to combat water pollution• Building up implementation capacity on various levels• Providing treatment for both, domestic and industrial waste- water at affordable price• Fulfillment of discharge standards and environmental laws• Wastewater pollution reduced by up to 90%• Providing treatment for waste- water flows up to 1000 m3 / day• Reliable and long lasting appli- cations• Tolerant towards inflow and load fluctuation• Materials/ inputs used for construction are locally available• Minimal maintenance and long • Resource efficiency and non • Resource recovery through de-sludging intervals dependence on energy wastewater re-use and biogas• Low operation and maintenance generation costsDEWATS Service Packageso Treatment Systems o Emergency Sanitation o Health Impact Assessmento Community Based Sanitation o Sanitation for Prisons & Hygiene Educationo School Based Sanitation o Sanitation for Real Estates o Capacity Developmento Sanitation for Hospitals & Hotels o Sanitation Mapping o Standardisationo Wastewater Treatment o Municipal Sludge Treatment o Research & Development for Agro-Industry Plant DEWATS – Decentralized Wastewater Treatment SolutionsDeveloped & disseminated by BORDA and over 20 BORDA BNS Network Partners in South and South East Asia & Southern Africa Bremen Overseas Research and Development Association BORDA Germany BORDA South East Asia BORDA South Asia BORDA SADC Head Ofﬁce Programme Ofﬁce Indonesia Programme Ofﬁce India Programme Ofﬁce fon: + 49 - 421-137 18 e-mail: ofﬁce@borda-net.org fon: + 62 - 274 88 82 73 fon: + 91 - 80 41 52 75 54 fon: + 255 - 681204991 www.borda-net.org e-mail: firstname.lastname@example.org e-mail: email@example.com e-mail: firstname.lastname@example.org