Clean Sludge (Work Package 3)
WP3 activities are to study the influence of wastewater quality and pollutants on the final sludge. The occurrence of heavy metals in sewage sludge and the sources from which these originate will be investigated. The primary focus is on cadmium, lead, copper, zink. The samples will determine content of organic matter, organic carbon, potassium, nitrogen, phosphorus and heavy metals: Cd, Pb, Zn, Ni, Cu. Pilot plant (screens and dewatering) to handle external sludge treatment separately. The reject water is going to be treated in the wastewater treatment plant but dewatered solid external sludge is separated and used in ways other than normal sludge handling. The aim is to improve the quality of the sludge produced in the treatment plant by removing the influence of external sludge.
Deliverable 3.1 – Small and medium scale WWTP wastewater quality assesment and its influence on sludge quality.
Deliverable 3.2 – National sludge handling rules comparison.
Deliverable 3.3 – Agricultural use of sludge.
Energy Efficiency (Work Package 4)
Energy efficiency is crucial in wastewater treatment, electrical energy costs contribute to most important costs of the treatment. Wastewater aeration and other related processes are connected with large energy consumption, but sludge dewatering and handling also can be optimized and new approaches can be proposed. Two main areas will be analysed: efficient sludge handling (SWE, POL, DEN). A technical and economic study on the sludge handling will be performed giving indicators which small and medium wastewater treatment plants can handle the sludge efficiently in local conditions and when it is feasible to treat the sludge centrally. Another aspect is sludge dewatering – dewatering technologies and techniques will be analysed and compared giving outlines for future investments and dewatering improvements. Using this tools energy consumption and costs can be reduced as well as associated CO2 emission.
Deliverable 4.1 – A plan for sludge treatment on waste water plants of different capacity.
Deliverable 4.2 – Overview of energy efficient sludge dewatering technologies.
Deliverable 4.3 – Energy efficient composting.
Nutrients Reuse (Work Package 5)
Baltic Sea eutrophication has many negative consequences in the entire ecosystem. Phosphorus and nitrogen load can be minimized if these nutrients are absorbed from the wastewater and reused in the agriculture. This can be done by activating the sludge or sludge composting, of course only in cases where the sludge quality and legislation allow such reuse and recirculation. On the other hand composting is a promising technology in case of many small and medium size WWTP but public acceptance has to be increased by eliminating negative effects such as odour nuisance. Therefore the work package concentrates on important issues of optimization of nutrient reuse and the increased technological level of deodorization. A better use of nitrogen and phosphorus on agricultural land by catching more nutrients in the sludge and a better handling practise. Composting process will be optimised from the point of view of nutrient content. Based on experiences available in the consortium guidelines for small and medium WWTP interested in composting and certification of the product will be given. Second area of activities is related to pilot plant of non-thermal plasma deodorization unit and a field test of deodorization efficiency and energy balance. Air composition and most important odour compounds will be identified and results will be published. Mittskåne Water has installed an on-line gauge for measuring ammonium in wastewater treatment plants and has plans to develop this to possibly control the process using the gauge.
Deliverable 5.1. – Guidelines for small and medium WWTP for efficient composting.
Deliverable 5.2. – Technical recommendations for waste air handling and deodorization technologies.
Deliverable 5.3. – Database of tested technologies.
Transfer of knowledge (Work Package 6)
The main objective of the work package is to allow professional knowledge exchange between project parters (universities – water treatment plants) as well as efficient project result communications to the society and potential end-users. A database of project technologies and results will be obtained, certain case – study description will be publised, exchange of best practices will be conducted by the exchange of personell for short – term study visits.
Deliverable 6.1. – Technology database.
Deliverable 6.2. – Case study descriptions.
Deliverable 6.3. – Secondments programm running.