Optimizing the in-line ozone injection and delivery strategy in a multistage pilot-scale greywater treatment system: System validation and cost-benefit analysis

Oh, Kai Siang; Poh, Phaik Eong; Chong, Meng Nan; Gouwanda, Darwin; Lam, Weng Hoong; Chee, Chung Yee

doi:10.1016/j.jece.2015.04.022

Cited by 21 publications

(6 citation statements)

References 20 publications

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“…The different small-diameter media (sand, clay pebbles, and gravel) below the soil layer have shown effectiveness [78] in treating GW. These layers in the pots cause slow water filtration, giving enough time for microorganisms and plants to remove nutrients from GW and ensuring that no soil is passed through from one pot plant to the next [79].…”

Section: Construction and Arrangement Of Staircase Wetlandmentioning

confidence: 99%

Staircase Wetlands for the Treatment of Greywater and the Effect of Greywater on Soil Biodiversity

Qadir¹,

Pino²,

Brambilla³

et al. 2023

Preprint

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Fresh water is an increasingly scarce resource in both urban and rural developments. As a response to this challenge, non-potable water reuse is on the rise. This research explored a potential off-grid system for water purification, consisting of a staircase wetland with terracotta pot plants working as a filter for greywater. The study further investigated the physicochemical properties of the greywater and the soil before and after the wetland purification. Results showed that the filtered water satisfied all requirements for water reuse, e.g., pH, turbidity, and total coliforms. The research then uniquely investigated the effect of greywater on the soil biodiversity and soil biomass using soil DNA extraction and the tea bag index testing method. The filtered greywater absorbed by soil decomposed the soil faster and stabilized it better compared to tap water-absorbed soil or unfiltered greywater. The DNA generation sequencing revealed no significant differences in alpha diversity between control and treatment samples. The beta diversity differences were significant. This nature-based solution can lead to reduced load on the sewage system, resulting in less wastewater generation.

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Section: Construction and Arrangement Of Staircase Wetlandmentioning

confidence: 99%

Staircase Wetlands for the Treatment of Greywater and the Effect of Greywater on Soil Biodiversity

Qadir¹,

Pino²,

Brambilla³

et al. 2023

Preprint

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“…For a visual observation of spray form and degree of dispersion, observation windows are provided (5), and the liquid level in the tank is controlled by means of level gauge (8). Saturated liquid over a pipeline (11) flows through a throttling valve (12) to the bottom part of the flotation tank (10). Under saturated liquid supply to a flotation cell its pressure abruptly reduces, and as a result, bubbling occurs with a subsequent formation of flotation complexes, which float on the surface due to low specific weight and a foam layer is formed.…”

Section: Liquid Atomization Under Dissolved Air Flotationmentioning

confidence: 99%

“…Ozonizing is one of the effective methods of purification of wastewaters of different origin [9,10]. Ozone is the strongest oxidant and is able to annihilate bacteria, spores, and viruses.…”

Section: Liquid Atomization Under Ozonizingmentioning

confidence: 99%

Intensification of oily waste waters purification by means of liquid atomization

Eskin

Tkach

Kim

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. In this research, a possibility of using liquid atomization for improving the efficiency of purification of wastewater by different methods has been studied. By the introduced method and an experimental setup for wastewater purification, saturation rate increases with its purification by means of dissolved air flotation. Liquid atomization under excess pressure allows to gain a large interfacial area between the saturated liquid and air, which may increase the rate of purified liquid saturation almost twice, compared to the existing methods of saturation. Current disadvantages of liquid atomization used for intensification of wastewater purification include high energy cost and secondary emulsion of polluting agents. It is also known that by means of liquid atomization a process of ozonizing can be intensified. Large contact surface between the purified liquid and ozone-air mixture increases the oxidizing efficiency, which allows to diminish ozone discharge. Liquid atomization may be used for purification of wastewaters by ultraviolet radiation. Small drops of liquid will be proportionally treated by ultraviolet, which makes it possible to do purification even of turbid wastewaters. High-speed liquid motion will prevent the pollution of quartz tubes of ultraviolet lamps.

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“…Of those that have, it is worth highlighting the analysis by Gallego-Valero et al [6], which uses an indirect method to analyse the financial sustainability of wastewater reclamation services for reuse; the WHO report that uses data from 94 countries [7], and a study by Fernández et al [8] examining policies for economically efficient, environmentally sustainable and socially equitable drinking water and sewerage services. Most related research, however, focuses on analysing the operating costs of the different treatment systems applied: Molinos-Senante et al [9] carry out a cost-benefit analysis with data from 13 WWTPs; Theregowda et al [10] compares the costs of applying different tertiary treatments; Oh et al [11] evaluates the costs and performance of an ozonation disinfection greywater treatment system; and De la Cruz et al [12] estimates and compares operating costs incurred in the disposal of 22 selected micropollutants in an effluent from a municipal WWTP. Also noteworthy are those studies that, using nonparametric methods such as data envelopment analysis (DEA), have analysed the techno-economic efficiency of WWTPs, including Guerrini et al, Castellet et al and Gómez et al [13][14][15] which uses a double-bootstrap DEA model.…”

Section: Introductionmentioning

confidence: 99%

Cost of Urban Wastewater Treatment and Ecotaxes: Evidence from Municipalities in Southern Europe

Pajares

Valero

Sánchez

2019

Water

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The principle of cost recovery established by the Water Framework Directive underlines the need for tax rates, which can raise enough revenue to finance the cost of treatments applied to wastewater. The objective of this research is to gain an understanding the different types of charges related to urban wastewater treatment that can be levied by the authorities responsible for this service. This paper also aims to determine whether these taxes contribute to guaranteeing the economic feasibility of the wastewater treatment plants. The proposed methodological approach is applied to 18 municipalities of a province in southern Europe in 2017. The results confirm that in most of these cases, the taxes levied do not guarantee adequate tax revenues to cover the running, maintenance and investment costs of municipal wastewater treatment plants. This situation leads to a lack of financial self-sufficiency in the wastewater management service, meaning that the imbalance between income and expenditure has to be covered by government subsidies. The results of this study will help guide authorities around the world that are in charge of managing urban wastewater treatment services.

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Optimizing the in-line ozone injection and delivery strategy in a multistage pilot-scale greywater treatment system: System validation and cost-benefit analysis

Cited by 21 publications

References 20 publications

Staircase Wetlands for the Treatment of Greywater and the Effect of Greywater on Soil Biodiversity

Staircase Wetlands for the Treatment of Greywater and the Effect of Greywater on Soil Biodiversity

Intensification of oily waste waters purification by means of liquid atomization

Cost of Urban Wastewater Treatment and Ecotaxes: Evidence from Municipalities in Southern Europe

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