The Seaborne process separates nutrients from the sewage sludge and produces a high quality fertilizer without heavy metals or organic pollutants. A first large-scale pilot plant with a modified Seaborne Technology was built on the wastewater treatment plant (WWTP) of Gifhorn in Germany. The plant was established in the year 2005 and the start-of-operation phase is being monitored technically and scientifically. The priority objective of the technical and scientific monitoring is to determine the efficiency of the process. This includes monitoring of resource consumption as well as the quality and quantity of the produced fertilizer. Furthermore the influence of this technology on the operation of the WWTP will be investigated. Another question to be answered is the profitability of the recycling process and a possible transferability to other WWTPs. Mass balances of nutrient and pollutant streams established before start-of-operation will be used as reference values for comparing future results. In addition, organic and inorganic pollutant concentrations in the digested sludge were determined before the sludge was fed to the Seaborne process. The obtained reference values will then be compared with the measuring results obtained under operation of the Seaborne process. Thus load redistribution in the material flows of the WWTP will be determined. Since so far, no stable operation of the large-scale Seaborne Technology has been achieved, it has not been possible to carry out the measuring programme. Therefore reference values for nutrient streams obtained from the primary mass balances, were used to calculate expected mass balances after implementing the Seaborne Technology to the WWTP, in order to be able to estimate possible future load redistribution in the material flows of the WWTP.
The selector activated sludge (SAS) systems are known to prevent excessive growth of filamentous microorganisms responsible for bulking sludge, but these systems were hardly ever modelled. This study aimed to develop a model capable of predicting rapid substrate removal in the SAS systems. For this purpose, the Activated Sludge Model No. 3 (ASM3) was extended with three processes (adsorption, direct growth on the adsorbed substrate under aerobic or anoxic conditions). The modified ASM3 was tested against the results of batch experiments with the biomass originating from two full-scale SAS systems in Germany. The endogenous biomass was mixed with various readily biodegradable substrates (acetate, peptone, glucose and wastewater) and the utilisation of substrate (expresses as COD) and oxygen uptake rates (OURs) were measured during the experiments. In general, model predictions fitted to the experimental data, but a considerable number of kinetic (5) and stoichiometric (2) parameters needed to be adjusted during model calibration. The simulation results revealed that storage was generally a dominating process compared to direct growth in terms of the adsorbed substrate utilisation. The contribution of storage ranged from 65-71% (Plant A) and 69-92% (Plant B).
Within the last decades in Europe, the EU standards have become stricter for the nitrogen concentration in effluent and the nitrogen removal performance in WWTP; many methods and strategies to improve the efficiency of WWTP have been developed. This paper will give an overview of the conventional technologies as well as advanced technologies using bio-augmentation, partial nitrification, and fully autotrophic ammonia oxidation. Compared to the German design guidelines A 131, in which the specific reaction volume is recommended from 150 to 250 l/PE, the optimized specific reaction volume of about 120 l/PE is significantly smaller. Furthermore, the bio-augmentation technologies with integrated sludge liquor treatment can reduce the specific reaction volume up to 50 l/PE.
A technical feasibility study was carried out at the wastewater treatment plant (WWTP) Hamm-West in 2018, which included preliminary planning for the improvement of the plant, using different advanced wastewater technologies. The results of the technical feasibility study show that the application of activated carbon or ozone, in combination with an additional filtration system, can not only remove organic micropollutants efficiently but can also significantly improve the quality of other standard parameters in the WWTP effluent. This technical feasibility study, along with seven other studies, is part of the module-based approach the Emschergenossenschaft and Lippeverband (EGLV) is pursuing in order to improve wastewater treatment plants with advanced treatment systems. Finally, the module-based approach can be used to pair the most suitable WWTPs with the best applicable technologies to improve the treatment process in the whole Lippe catchment area.
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