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Abstract

The present work focuses on a first study for a piezoelectric harvesting system, finalized to the obtaining of electrical energy from the kinetic energy of rainy precipitation, a renewable energy source not really considered until now. The system, after the realization, can be collocated on the roof of an house, configuring a “Piezo Roof Harvesting System”. After presenting a state of art of the harvesting systems from environmental energy, linked to vibrations, using piezoelectric structures, and of piezoelectric harvesting systems functioning with rain, the authors propose an analysis of the fundamental features of rainy precipitations for the definition of the harvesting system. Then, four key patterns for the realization of a piezoelectric energy harvesting system are discussed and analysed, arriving to the choice of a cantilever beam scheme, in which the piezoelectric material works in 31 mode. An electro-mechanical model for the simulation of performance of the unit for the energetic conversion, composed of three blocks, is proposed. The model is used for a simulation campaign to perform the final choice of the more suitable piezoelectric unit, available on the market, which will be adopted for the realization of the “Piezo Roof Harvesting System”.

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Authors and Affiliations

Romeo di Leo
1
Massimo Viscardi
1
Francesco Paolo Tuccinardi
2
Michele Visone
3

  1. Department of Industrial Engineering – Aerospace section, University of Naples “Federico II”, Italy
  2. Promete S.r.l., Naples, Italy
  3. Blue Design S.r.l., Naples, Italy
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Abstract

Rain gardens are one of the best measures for rainfall runoff and pollutant abatement in sponge city construction. The rain garden system was designed and developed for the problem of severely impeded urban water circulation. The rain gardens monitored the rainfall runoff abatement and pollutant removal capacity for 46 sessions from January 2018 to December 2019. Based on these data, the impact of rain gardens on runoff abatement rate and pollutant removal rate was studied. The results obtained indicated that the rain garden on the runoff abatement rate reached 82.5%, except with extreme rainfall, all fields of rainfall can be effectively abated. The removal rate of suspended solid particles was the highest, followed by total nitrogen and total phosphorus, the total removal rate in 66.35% above. The rain garden is still in the “youth stage”, and all aspects of the operation effect are good.
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Authors and Affiliations

Weijia Liu
1
Qingbao Pei
2
Wenbiao Dong
2
Pengfan Chen
2

  1. East China University of Technology, Nanchang, China
  2. Nanchang Institute of Technology Poyang Lake Basin Water Engineering Safety and Efficient Utilization National and Local Joint Engineering Laboratory, Nanchang, China
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Abstract

Water quality is an environmental priority for irrigation in rainfed agriculture. Recently, water quality has been affect-ed by the uncontrolled disposal of wastewater, the use of chemical fertilizers in agriculture and, most significantly, by the excessive exploitation of water resources during the low season. The basin of the Maffragh in the Algerian north-east real is fed by two main rivers: Wadi El Kebir East and Bounnamoussa. From its source, the stream is continually contaminated with domestic and agricultural discharges through the tributaries causing a significant deterioration in water quality. In or-der to know the current state of water quality in the Maffragh basin and to determine its suitability for irrigation without any prior treatment, research has been conducted in the two streams at representative sampling points in catchment areas used for irrigating crops. To assess the quality of water and detectable compounds monitoring, laboratory methods are used. The various volumetric and colorimetric assays were carried out according to Jean Rodier. Organic parameters such as ni-trites, ammonium and phosphates, were measured using a UV/VIS 6705 JENWAY spectrophotometer, at wavelengths of 543 nm, 630 nm and 880 nm respectively for nitrites, ammonium and phosphates. The BOD5 and COD parameter was measured using a DIN EN 1899-1-H51 spectrophotometer and DIN ISO15705: 2002 spectrophotometer. The performed analyses on conductivity shows oscillating values ranging between 425 and 495 μS∙cm–1 for January 2018, while for the low water level of July 2018 the conductivity varies between 433 and 796 μS∙cm–1; this parameter is determinant for water quality assessment and its use for irrigation. Beside the conductivity test, the Riverside–Wilcox diagram was applied, to combine conductivity and sodium absorption rate (SAR). The obtained results of the two seasons show satisfactory results in the applicability of the water to irrigate in the basin.
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Authors and Affiliations

Selwa Boubguira
1
ORCID: ORCID
Derradji Zouini
1
Sayad Lamine
1
Nawel Dali
2

  1. University of Badji Mokhtar, Faculty of Earth Sciences, Geological Research Laboratory (LRG), BP 12 / 23000 Annaba, Algeria
  2. University Abess Laghrour Khenchela, Department of Ecology, Khenchela, Algeria
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Abstract

Corrosion of water distribution system is a significant issue causing problems with quality, safety and continuity of distribution. The changes of corrosion rates of the water distribution systems in Cracow made of carbon steel were investigated by analysis of online corrosion monitoring system results. Corrosion rates were determined using the linear polarization method. The impact of rain, temperatures, conductivity, dissolved oxygen content on corrosion rate were characterized. The corrosivity of different water sources like mountain water, underground water or river water were indicated. The possible actions for reducing corrosion losses were characterized. Results show that pollution of the environment in the form of acid rain and runoff from agriculture as well as the type of the source water has significant influence on corrosion of water distribution system. Corrosion monitoring system gives possibility of controlling corrosion rate by mixing waters from different sources in the way to obtain less corrosive mixture (see Fig. 8).

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Authors and Affiliations

A. Jażdżewska
M. Gruszka
R. Mazur
J. Orlikowski
J. Banaś
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Abstract

At present, stormwater management is one of the key issues in urban policy. This is due to the increasing urbanisation, climate change, the growing threat of extreme (weather) events and the need to protect water resources. Legislation plays an essential role in the process of project planning and implementation. The recognition of opportunities and barriers contained in these regulations forms the basis for action by the central government, local authorities and investors. The article aims to analyse legal provisions, administrative decisions and factual circumstances that provide the foundation of administrative court rulings in Poland and regard the legal possibilities of rainwater management in urban areas. The adopted research method allows for/includes the author’s interpretation and formulation of de lege ferenda conclusions. The results of analyses of both European and national legislation and case law indicate that there is a problem with the interpretation of existing legislation and the lack of legal definitions of basic equipment and solutions in the field of water law, for instance. Such legal circumstances make it difficult to make the required legal decisions, and have a negative impact on the timing of implementation and number of these muchneeded projects.
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Authors and Affiliations

Marcin Sobota
1
ORCID: ORCID
Ewa Burszta-Adamiak
2
ORCID: ORCID
Tomasz Kowalczyk
2
ORCID: ORCID

  1. Wrocław University of Environmental and Life Sciences, Environmental Engineering and Geodesy, Grunwaldzka St. 55, 50-357 Wrocław, Poland
  2. Wrocław University of Environmental and Life Sciences, Environmental Engineering and Geodesy,Grunwaldzka St. 55, 50-357 Wrocław, Poland

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