Anna Henclik

Fertilisers production from ashes after sewage sludge combustion – A strategy towards sustainable development

&NA; Sustainable development and circular economy rules force the global fertilizer industry to develop new phosphorous recovery methods from alternative sources. In this paper a phosphorus recovery technology from Polish industrial Sewage Sludge Ashes was investigated (PolFerAsh – Polish Fertilizers form Ash). A wet method with the use of mineral acid and neutralization was proposed. Detailed characteristic of SSA from largest mono‐combustion plans were given and compared to raw materials used on the market. The technological factors associated with such materials were discussed. The composition of the extracts was compared to typical industrial phosphoric acid and standard values characterizing suspension fertilizers. The most favorable conditions for selective precipitation of phosphorus compounds were revealed. The fertilizers obtained also meet EU regulations in the case of the newly discussed Cd content. The process was scaled up and a flow mass diagram was defined. HighlightsComparison of Polish SSA to phosphate raw materials (MER, I&A).Non‐waste technology of SSA utilization according to circular economy.Obtained fertilisers fulfil requirements for all standardized metals.Technology tested in a semi‐technical scale.Sankey diagram of the P flow in the PolFerAsh recovery process.

Characteristic of wet method of phosphorus recovery from polish sewage sludge ash with

Abstract Sewage Sludge Ash (SSA) is a concentrated source of phosphorus and can be successfully recycled via a number of different routes. This paper presents research results on phosphorus recovery from differently combusted sewage sludge with the use of nitric acid extraction. Different SSA forms from Polish thermal utilization stations were compared. It was revealed that sewage treatment technology as well as combustion technology influence many physical and chemical parameters of ashes that are crucial for further phosphorus recovery from such waste according to the proposed method. Presented research defines extraction efficiency, characterized extracts composition and verifies the possibility of using SSA as cheaper and alternative sources of phosphorus compounds. Gdynia, Kielce and Kraków SSA have the best properties for the proposed technology of phosphorus recovery with high extraction efficiency greater than 86%. Unsuitable results were obtained for Bydgoszcz, Szczecin Slag and Warszawa SSA. Extraction process for Łódź and Szczecin Dust SSA need to be improved for a higher phosphorus extraction efficiency greater than 80%. Phosphorus content in extracts varies from 1.6 to 103.4 g PO43− per 1 dm3, nitrogen content was 167,4 g per 1 dm3 while the K content reached 0.2 to 2.37 g per 1 dm3. The lowest content of Fe, Ni, Cr, Cd is noted in extracts after phosphorus recovery from Gdynia SSA, where the phosphorus content is also at the highest level. The proposed solution can be considered as waste minimization technology by the rational recycling of phosphorus and could be used in industry to produce fertilizers.

Ecological Life Cycle Assessment of Modified Novolaks Waste Used in Industrial Wastewater Treatment

Abstract Ecological Life Cycle Assessment (LCA) applied in the assessment of the impact of products on the environment is a technique that allows for the evaluation of the environmental impact of polymeric flocculants used in industrial wastewater treatment. The possibility of conducting a full life cycle and thus manufacturing process analysis allows for reliable and accurate identification of the sources of environmental hazards and the impact of new products on the environment. Newly synthesized waste-based polymers are water soluble and possess the properties of flocculants, while reducing the parameters in industrial wastewater. In the paper, there are presented the results of the analysis conducted using LCA technique for the assessment of the impact of modified waste phenol formaldehyde resin (Novolak) on the environment. LCA technique was used to assess the impact of the new flocculant applied in the process of metallurgical wastewater treatment taking into account the environmental impact of the flocculant manufacturing process.

Zastosowanie cyklu życia do oceny wpływu na środowisko nowo zsyntezowanych flokulantów polimerowych

Wastes from prodn. of PhOH-CH2O and styrene resins were used for prepn. of flocculants applied in treatment of metallurgical wastewater by coagulation. The anal. of life cycle of the flocculants showed their advantage over corn. ones.

LCA application in the assessment of new technologies of industrial effluents treatment

AbstractLife cycle assessment (LCA) is a technique often used to assess the impact of technological processes on the environment and on human health. It can be also used as a tool to assess environmental micropollutants. The possibility to conduct full LCA of particular stages of technology by means of appropriate LCA software can allow for reliable identification of the sources of chemical hazards in the environment, with particular focus on the source and the amount of macro and micropollutants. Full LCA includes obtaining raw materials, production, transport, distribution, the use, maintenance, reusing, recycling and disposal. The possibility to apply LCA technique to assess i.e. chemical hazards in potential wastewater treatment with the use of new flocculants and therefore to shape the environment is presented in the study. An example of applying LCA to identify the sources and environmental impact assessment of the stage of potential production of new generation flocculants synthesised from post pro...