Search results for "Wastewaters"

Wastewaters from citrus processing industry as natural biostimulants for soil microbial community

2020

Abstract Citrus fruit processing wastewaters (CWWs), being rich in organic matter, may be a valuable resource for agricultural irrigation and, possibly, for the improvement of soil organic carbon (TOC). This issue is becoming crucial for soils of arid and semiarid environments increasingly experiencing water scarcity and continuous decline of TOC towards levels insufficient to sustain crop production. However, before using CWWs in agriculture their effects on the soil living component have to be clarified. Therefore, in this study we assessed the impact of CWWs on soil chemical and biochemical properties. Under laboratory conditions, lemon, orange and tangerine wastewaters were separately a…

Simultaneous Removal and Recovery of Metal Ions and Dyes from Wastewater through Montmorillonite Clay Mineral

2019

The main objective of this work was to evaluate the potential of Montmorillonite nanoclay (Mt), readily and inexpensively available, for the simultaneous adsorption (and removal) of two classes of pollutants: metal ions and dyes. The attention was focused on two &ldquo

DEVELOPMENT OF ELECTROCHEMICAL MICROFLUIC DEVICES FOR THE TREATMENT OF WASTEWATERS AND THE SYNTHESIS OF CHEMICAL

A sustainable phenolic compound extraction system from olive oil mill wastewater

2017

Abstract The reduction of environmental impact and the achievement of economic advantages based on by-product recovery is the aim of applying methodologies for phenolic compounds extraction from Olive Oil Mill Wastewater. Volume reduction of Olive Oil Mill Wastewater could generate important advantages in terms of waste disposal cost abatement and, in addition, reuse in the production of foods with health properties could lead to economic benefits. Despite the fact that literature shows that several techniques have been developed, few economic approaches have been presented. This paper assesses the economic feasibility of a system based on membrane filtration and reverse osmosis processes f…

Refractory organic pollutants and toxicity in pulp and paper mill wastewaters

2015

This review describes medium and high molecular weight organic material found in wastewaters from pulp and paper industry. The aim is to review the versatile pollutants and the analysis methods for their determination. Among other pollutants, biocides, extractives, and lignin-derived compounds are major contributors to harmful effects, such as toxicity, of industrial wastewaters. Toxicity of wastewaters from pulp and paper mills is briefly evaluated including the methods for toxicity analyses. Traditionally, wastewater purification includes mechanical treatment followed by chemical and/or biological treatment processes. A variety of methods are available for the purification of industrial w…

Olive mill wastewaters decontamination based on organo-nano-clay composites

2019

Abstract Green composites for environmental applications were successfully prepared by intercalation of the biosurfactant Quillaja saponin onto montmorillonite mineral clay on varying pH and surfactant/clay ratio. Equilibrium adsorption isotherms were constructed and the system was characterized by performing TGA and XRD analyses. The efficiency of the surfactant-modified clay in the removal of the organic content present in olive mill wastewaters (OMW) was evaluated by means of spectrophotometric measurements. The interest for this cogent issue comes from the consideration that, despite their high pollutant content, OMW can be considered as a potential resource of several organic compounds…

Modelling biological and chemically induced precipitation of calcium phosphate in enhanced biological phosphorus removal systems

2011

The biologically induced precipitation processes can be important in wastewater treatment, in particular treating raw wastewater with high calcium concentration combined with Enhanced Biological Phosphorus Removal. Currently, there is little information and experience in modelling jointly biological and chemical processes. This paper presents a calcium phosphate precipitation model and its inclusion in the Activated Sludge Model No 2d (ASM2d). The proposed precipitation model considers that aqueous phase reactions quickly achieve the chemical equilibrium and that aqueous-solid change is kinetically governed. The model was calibrated using data from four experiments in a Sequencing Batch Rea…

EXPERIMENTAL CHARACTERIZATION OF ELECTRO-MEMBRANE PROCESSES FOR THE PRODUCTION AND STORAGE OF ENERGY

2022

Mūsas upes ūdens ķīmiskā kvalitāte

2015

Ūdeņu ķīmijas pētījumiem ir liela nozīme, jo ūdens ir viens no nepieciešamākajiem resursiem cilvēkiem. Ūdens ķīmiskais sastāvs nosaka ūdens kvalitāti, kuru ir jāpārzina, lai pārvaldītu, racionāli izmantotu un aizsargātu ūdeņus. Latvijas virszemes ūdeņu ķīmisko sastāvu ietekmē dažādi faktori – ģeogrāfiskais novietojums, teritorijas ģeoloģiskā uzbūve, klimats, hidroloģiskie, ģeoķīmiskie procesi un antropogēnā darbība. Lielākoties Mūsas upes ūdeņu ķīmiskais sastāvs veidojas Lietuvā. Upes garums Latvijā ir vien 20 km no kopējiem 164 km un baseina lielums Latvijā ir vien 2 % no kopējās baseina platības. Darba mērķis ir novērtēt Mūsas upes ūdens ķīmisko kvalitāti un apskatīt punktveida piesārņotā…

Ultrasound assisted method to increase soluble chemical oxygen demand (SCOD) of sewage sludge for digestion

2004

The aim of this study was to clarify the possibilities to increase the amount of soluble chemical oxygen demand (SCOD) and methane production of sludge using ultrasound technologies with and without oxidising agents. The study was done using multivariate data analyses. The most important factors affected were discovered. Ultrasonically assisted disintegration increased clearly the amount of SCOD of sludge. Also more methane was produced from treated sludge in anaerobic batch assays compared to the sludge with no ultrasonic treatment. Multivariate data analysis showed that ultrasonic power, dry solid content of sludge (DS), sludge temperature and ultrasonic treatment time have the most signi…