Consequences of surface water eutrophication: remedy and environmental interest

Panettieri

et al. 2021

Waste Biomass Valor

Purpose Seaweed blooms are an irregular but frequent phenomenon in many coastal areas and during the touristic season, can cause limitations for recreational use of beaches. Here, we propose composting of seaweed removed from the shoreline as alternative to current management practices (e.g. disposal in landfills or incineration). Methods A co-composting strategy with garden prune waste was chosen for the treatment of seaweed blooms removed from the beaches. Composting was performed in windrows of 10 m long, 1.5 m wide and 1 m high using different ratios of algae and garden prune residues (1:2; 1:1 and 2:1) at a composting facility in Rota (Cádiz, Spain). Results Characteristic temperature profiles consisting of a very brief mesophilic phase, a 15–20-day thermophilic phase (maximum of 50–70 °C) and a second mesophilic phase (40–35ºC) after 30–50 days were observed. After curing for more than 160 days, a stabilized non-phytotoxic composted material (50–70 g kg−1 C; 2–3 g kg−1 N; C/N ratio of 21–27 and electrical conductivity between 1.8–2.4 mS cm−1) was obtained. Composting worked best using a 2:1 ratio (prune waste:algae). The composted organic material showed larger presence of stabilized lignin-derived compounds as assessed via nuclear magnetic resonance. No odors were detected during the composting process suggesting that open-air treatment is feasible. Conclusion The co-composting strategy provides a safe, local and sustainable approach to deal with seaweed blooms during peaks of recreational use and in situations where algae have to be removed. Graphic Abstract

Section: Temperaturesupporting

confidence: 76%

Composting as Sustainable Managing Option for Seaweed Blooms on Recreational Beaches

Panettieri

et al. 2021

Waste Biomass Valor

“…This method first combines the characteristics of water production and concentration process to construct a multi-level river network in Huhu Lake Basin, and describes the development process of VE and concentration from macro to micro level. Based on the multi-level river network of the basin, this paper establishes the system structure of MLG of VE, and uses GIS technology to generalize the lake road pipe network system and preprocess the watershed terrain, realizes the combination of macro and micro concentration systems, and completes the division of grid units at all levels [13][14].…”

Section: Figure 1general Idea Of Mlg Construction Methods For Eutroph...mentioning

confidence: 99%

Water Eutrophication based on Multilevel Grid

2020

AJEB

With the acceleration of the process of lacustrization, the ensuing eutrophication disaster of water body has an increasing impact on people's normal life and production. Lake water body calculation model is an important means to realize the mechanism analysis, risk assessment and loss calculation of eutrophication disaster. Aiming at the problems and difficulties existing in the research of eutrophication of lake water, this paper introduces the advanced idea of multi-level grid(MLG) of spatial information to solve the above problems, discusses the general idea of MLG construction method of eutrophication of water, proposes the related technologies of grid spatial database, and finally builds a series of analysis and decision-making models based on MLG through the parameter collection and calibration test analysis of MLG experimental model, Provide strong data support for the prevention and control of water eutrophication(VE) disasters.

“…Most authors attribute this high toxicity to the presence of phenolic compounds. [3][4][5][6] The content of phenolic compounds in OMW can reach up to 24 g l −1 . 27 In our case, the value of 1.72 g l −1 was lower than the value reported in the literature due to the origin of the OMW.…”

Section: Physicochemical Characteristics Of the Omw Samplesmentioning

confidence: 99%

“…3 The high organic load of OMW requires a high oxygen consumption, expressed in terms of chemical oxygen demand (COD) and biological oxygen demand (BOD), leading to eutrophication of surface water. 4 OMW also reduces soil quality by increasing its water repellence due to the presence of aliphatic compounds in addition to the presence of polyphenols known for their phytotoxic effect preventing seed germination and plant growth. 5,6 The literature shows a variety of approaches for the treatment of OMW before disposal in nature.…”

Section: Introductionmentioning

confidence: 99%

Olive Mill Wastewater for Bioethanol Production using Immobilised Cells

Ayadi

Meziane

Rouam

et al. 2022

Kemija U Industriji

Physicochemical and microbiological characteristics of a local traditional olive mill wastewater, at Ennakhla-Chlef in northern Algeria, were evaluated. The olive mill wastewater samples had slight acidity of 0.65 % with a pH = 4.88, and electrical conductivity of 34 mS cm −1 . The chemical oxygen demand (COD) and the biological oxygen demand (BOD 5 ) reached up to 183 g l −1 and 7 g l −1 , respectively. In addition, the samples showed 1.72 g l −1 of total phenolic compounds. Preliminary microbiological analysis of the wastewater showed the presence of various microorganisms represented especially by lactic acid bacteria and Enterococcus sp. to the aim of this work was to investigate the possibility of using yeast strains isolated from olive mill wastewater in the fermentation of the latter. The results shown that fermentation with yeast can produce ethanol at an extent of 1.4 % (v/v). This can constitute a strategy for treating mentioned wastewater and transforming it into valuable biomolecules.