The implementation of Water Framework Directive, speaking about the need to achieve good water status, and thus the corresponding sewage treatment caused the problem of waste water management has become a very important starting from the municipal level, through the national and the European ending. Sustainability, although not explicitly mentioned in the relevant EU or national legislation, it is key to implement wastewater systems. Their main objectives are to protect and promote human health by providing a clean environment, and breaking the cycle of disease. In this paper sustainability of wastewater collection and treatment options in the rural communities' in Poland, are discussed in the context of recent infrastructure investments. The paper presents an attempt to evaluate the implemented solutions for wastewater management in rural areas considering sustainable development criteria. Advantages and disadvantages of proposed system has been analysed with the focus to the question of selecting the right strategy that would fulfil both population and environmental needs. ; Wdrożenie Ramowej Dyrektywy Wodnej, mówiącej o potrzebie osiągnięcia dobrego stanu wód, i w związku z tym odpowiedniego oczyszczenie ścieków spowodowało, iż problem gospodarki ściekowej stał się bardzo ważny poczynając od szczebla gminnego, poprzez narodowy na europejskim kończąc. Zrównoważony rozwój choć nie został wyraźnie wymieniony w odnośnym prawodawstwie krajowym i europejskim jest kluczowy dla wdrażania programów oczyszczania ścieków. Głównym celem jest ochrona i promowanie zdrowia ludzi poprzez zapewnienie czystego środowiska. Zrównoważony rozwój przy wyborze systemów oczyszczania ścieków na terenach wiejskich w Polsce omówiono w kontekście niedawnych inwestycji infrastrukturalnych. W artykule przedstawiono próbę oceny wdrożonych rozwiązań dla gospodarki ściekowej na terenie wiejskim biorąc pod uwagę kryteria zrównoważonego rozwoju. Wady i zalety proponowanych systemów oczyszczania ścieków analizowano z naciskiem na kwestie wyboru właściwego systemu, który zaspokoi potrzeby ludności i nie wpłynie negatywnie na środowisko.
The implementation of Water Framework Directive, speaking about the need to achieve good water status, and thus the corresponding sewage treatment caused the problem of waste water management has become a very important starting from the municipal level, through the national and the European ending. Sustainability, although not explicitly mentioned in the relevant EU or national legislation, it is key to implement wastewater systems. Their main objectives are to protect and promote human health by providing a clean environment, and breaking the cycle of disease. In this paper sustainability of wastewater collection and treatment options in the rural communities' in Poland, are discussed in the context of recent infrastructure investments. The paper presents an attempt to evaluate the implemented solutions for wastewater management in rural areas considering sustainable development criteria. Advantages and disadvantages of proposed system has been analysed with the focus to the question of selecting the right strategy that would fulfil both population and environmental needs.
The production of biofuels is strongly supported all over the world as a renewable energy source for reducing dependence on the unstable oil market. Bioethanol, the main biofuel produced in the world, is widely used to power vehicles in both the USA and Brazil, but concerns exist in both places regarding its sustainability. In Brazil, it is produced from a by product of the sugar cane industry, while in the USA it is manufactured from food crops. The production of biogas and biodiesel is growing rapidly, but neither has outpaced the production of bioethanol. The European Union (EU) is greatly interested in this issue, and in 2011 adopted an extensive strategy to reduce carbon dioxide emissions related to transport by 60% by the year 2050. In order to achieve this result, the current European transportation system must be transformed. This ambitious goal will require the implementation of complex measures including the reduction of fossil fuels in favor of renewable fuels. This program has various options regarding the development of biofuels (e. g., biogas, bioethanol and biodiesel) and their related technologies, which are still on trial (mainly regarding the bioethanol production), and must also analyze their sustainability from a social and economic standpoint. The paper discusses the use of biofuels for transport in the European setting, and shows that their sustainability may result in relevant negative social effects due mainly to the use of land for energy crops (e.g., change of food price and world food shortage). ; A produção de biocombustíveis é fortemente reconhecida em todo o mundo como uma fonte de energia renovável para reduzir a dependência do mercado instável do petróleo. Bioetanol, o principal biocombustível produzido no mundo, é largamente utilizado para a mobilidade no Brasil, e também nos EUA, mas com diferenças de sustentabilidade, porque no Brasil ele é produzido a partir de um subproduto da indústria de cana-de-açúcar, enquanto nos EUA é fabricado com culturas alimentares. Biogás e biodiesel estão crescendo rapidamente, mesmo que em um nível muito menor do que o bioetanol. A União Europeia (UE) observa este assunto com grande interesse e, há dois anos, adoptou uma ampla estratégia para reduzir em 60% as emissões de dióxido de carbono no setor de transporte, até o ano 2050. A fim de alcançar esse resultado, será necessária a transformação do atual sistema europeu de transportes. A ambiciosa meta implicará em medidas complexas, incluindo a limitação do uso de combustíveis fósseis em favor de combustíveis renováveis. Este programa abre várias possibilidades de desenvolvimento dos biocombustíveis (ou seja, biogás, bioetanol e biodiesel). Para concretizar este avanço, é preciso se desenvolver tecnologias de nova geração em fase de experimentação (principalmente para a produção de bioetanol a partir de resíduos florestais), bem como a análise da sustentabilidade econômica e social desta nova fonte de combustível. Este artigo trata da utilização de biocombustíveis nos transportes no cenário europeu e mostra que a produção de biocombustíveis pode aumentar efeitos sociais negativos relevantes, principalmente ligados ao uso da terra para culturas energéticas em vez de alimentos com efeitos sobre o preço de mercado e da escassez mundial de alimentos. ; The production of biofuels is strongly supported all over the world as a renewable energy source for reducing dependence on the unstable oil market. Bioethanol, the main biofuel produced in the world, is widely used to power vehicles in both the USA and Brazil, but concerns exist in both places regarding its sustainability. In Brazil, it is produced from a by product of the sugar cane industry, while in the USA it is manufactured from food crops. The production of biogas and biodiesel is growing rapidly, but neither has outpaced the production of bioethanol. The European Union (EU) is greatly interested in this issue, and in 2011 adopted an extensive strategy to reduce carbon dioxide emissions related to transport by 60% by the year 2050. In order to achieve this result, the current European transportation system must be transformed. This ambitious goal will require the implementation of complex measures including the reduction of fossil fuels in favor of renewable fuels. This program has various options regarding the development of biofuels (e. g., biogas, bioethanol and biodiesel) and their related technologies, which are still on trial (mainly regarding the bioethanol production), and must also analyze their sustainability from a social and economic standpoint. The paper discusses the use of biofuels for transport in the European setting, and shows that their sustainability may result in relevant negative social effects due mainly to the use of land for energy crops (e.g., change of food price and world food shortage).
AbstractThe issue of sustainable management of biosolids (excess sludge) from wastewater treatment is an important issue in the entire developed world. Residual sludge disposal costs and environmental impact may be significant, and reducing such costs, as well as the energy consumption for dewatering and drying, is a key issue for safe and sustainable sludge disposal, considering the recent ban of some disposal options, such as landfilling, in many European countries. An alternative to thermal technologies is solar drying (not to be confused with bio-drying, very close to the concept of composting). Solar greenhouse drying technology is characterized by reduced land requirements compared with traditional outdoor drying beds, as well as by low-energy requirements compared with other thermal drying methods. Process operation is cost-efficient, with close to no maintenance, and observed specific evaporation rates up to threefold higher than conventional drying beds. Many applications of this technology exist in Poland, Germany and Austria: more than 10,000 t of wet sludge per year is treated in this way in Germany alone and almost as many (9000 t/year) in Poland. This paper examines current biosolids treatment technologies applicable to small wastewater treatment plants (2000–9999 population equivalents served) and opportunities for possible solids reuse in Poland in view of sustainable circular economy schemes. In particular, a purely solar-driven greenhouse facility for sewage sludge drying was investigated under different conditions (season, temperature, environmental humidity) and possible improvements for its efficiency evaluated. Sludge processed by solar drying could have different final disposal pathways, according to season, in accordance with the prescriptions of the new National Waste Management Plan of Poland.
AbstractDespite solid wastes' landfill disposal limitation due to recent European legislation, landfill leachate disposal remains a significant problem and will be for many years in the future, since its production may persist for years after a site's closure. Among process technologies proposed for its treatment, microbial fuel cells (MFCs) can be effective, achieving both contaminant removal and simultaneous energy recovery. Start-up and operation of two dual-chamber MFCs with different electrodes' structure, fed with mature municipal solid waste landfill leachate, are reported in this study. Influent (a mix of dairy wastewater and mature landfill leachate at varying proportions) was fed to the anodic chambers of the units, under different conditions. The maximum COD removal efficiency achieved was 84.9% at low leachate/dairy mix, and 66.3% with 7.6% coulombic efficiency (CE) at a leachate/dairy ratio of 20%. Operational issues and effects of cells' architecture and electrode materials on systems' performance are analyzed and discussed.
Despite solid wastes' landfill disposal limitation due to recent European legislation, landfill leachate disposal remains a significant problem and will be for many years in the future, since its production may persist for years after a site's closure. Among process technologies proposed for its treatment, microbial fuel cells (MFCs) can be effective, achieving both contaminant removal and simultaneous energy recovery. Start-up and operation of two dual-chamber MFCs with different electrodes' structure, fed with mature municipal solid waste landfill leachate, are reported in this study. Influent (a mix of dairy wastewater and mature landfill leachate at varying proportions) was fed to the anodic chambers of the units, under different conditions. The maximum COD removal efficiency achieved was 84.9% at low leachate/dairy mix, and 66.3% with 7.6% coulombic efficiency (CE) at a leachate/dairy ratio of 20%. Operational issues and effects of cells' architecture and electrode materials on systems' performance are analyzed and discussed.
Despite solid wastes' landfill disposal limitation due to recent European legislation, landfill leachate disposal remains a significant problem and will be for many years in the future, since its production may persist for years after a site's closure. Among process technologies proposed for its treatment, microbial fuel cells (MFCs) can be effective, achieving both contaminant removal and simultaneous energy recovery. Start-up and operation of two dual-chamber MFCs with different electrodes' structure, fed with mature municipal solid waste landfill leachate, are reported in this study. Influent (a mix of dairy wastewater and mature landfill leachate at varying proportions) was fed to the anodic chambers of the units, under different conditions. The maximum COD removal efficiency achieved was 84.9% at low leachate/dairy mix, and 66.3% with 7.6% coulombic efficiency (CE) at a leachate/dairy ratio of 20%. Operational issues and effects of cells' architecture and electrode materials on systems' performance are analyzed and discussed
The electric performance of a Microbial Fuel Cell (MFC) fed with swine manure, and specifically the interactions between different coexisting bacterial populations are examined in relationship to the Organic Loading Rate (OLR) and External Resistance applied to the cell. Feasibility of swine manure treatment using MFCs was already demonstrated by previous studies, however low Coulombic efficiencies were attained due to a competing methanogenic degradation occurring in the same cells. External resistance (Rext) and Organic Loading Rate have been identified as two of the key parameters affecting the balance between exoelectrogenic and methanogenic bacterial populations in a MFC system; despite this, virtually no attention had been paid to the study of OLR influence on MFCs performance. This study evaluates the performance of a MFC, treating swine manure, in this perspective, demonstrating that high OLRs (up to 11.2 kg COD m3/d) have a limiting effect on MFCs electrochemical losses, and increase absolute values of ORR (4.6 kg COD m3/d) and current production (14.9 mA). On the other hand, adoption of low OLR (as low as 0.7 kg COD m3/d) translates in an increase of both organic matter removal efficiency (52%) and Coulombic efficiency (higher than 70%). These improvements can be directly connected with the shifting balance between exoelectrogenic and methanogenic biomass populations, as confirmed by the cell's anode off-gas analysis. Hence, by adopting the appropriate design value of ORL and operating conditions, the MFC's biofilm exoelectrogenic population fraction, and thus its overall activity, can be improved considerably ; Mr. Molognoni was supported by a scholarship from the University of Pavia, and by a LLP/ERASMUS mobility grant at Lequia, Girona (Spain), where this research was in part supported by a grant from the Spanish Government (CTQ 2011-23632)
Microbial electrosynthesis (MES) for bioelectro carbon dioxide (CO2) recycling is an interesting and sustainable opportunity to exploit off gases from industrial facilities and convert them into valuable energy sources. In the present study, a two-step process based on coupling a bioelectrochemical system (BES) and heterotrophic microalgae Auxenochlorella protothecoides is proposed to convert carbon dioxide into a biodiesel compatible oil. The MES effluent was further processed in a heterotrophic microalgae batch reactor, where the acetate previously synthesized from CO2 was converted into bio-oil in a subsequent, extraction-free step. Two MES reactors were operated in batch mode at an applied cathodic potential of 0.8 V vs. SHE (standard hydrogen electrode) for 95 days. The system reached a concentration of up to 13 g L 1 of acetate (at a maximum production rate of 0.29 g L 1 d 1). Microbial community analysis revealed the presence of Clostridium spp. in both reactors. In a second stage, the effluent from the biocathode was transferred to microalgae reactors containing A. protothecoides to assess oil production. The bio-oil content was up to 22% w/w (dry weight), sufficient to further explore the feasibility of microalgae-to-oil recovery in the future. According to our estimations, 7.59 kg CO2 can be converted into 1 kg acetate, which can be used to grow heterotrophically 1.11 kg dry algae; an overall balance of 0.03 kg bio-oil produced per kg CO2 captured was assessed. The oil obtained can be further processed to produce a biodiesel compatible with EU requirements for biofuels ; This research was funded by the Spanish Ministry of Science through the grant RTI2018-098360-B-I00 and the Agency for Business Competitiveness of the Government of Catalonia (ACCIO) through the DigesTake Project (COMRDI16-1-0061). E. ´ P.-V. is grateful for the Research Training grant from the University of Girona (IFUdG2018/52). S. P. is a Serra Hunter ´ Fellow (UdG-AG-575) and acknowledges the funding from the ICREA Acad`emia award. ...
