Treatment of domestic wastewater using a lab-scale activated sludge/vertical flow subsurface constructed wetlands by using Cyperus alternifolius

Bilgin, Melayib; Şimşek, İsmail; Tulun, Şevket

doi:10.1016/j.ecoleng.2014.06.032

Cited by 42 publications

(21 citation statements)

References 19 publications

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“…As shown in Table 1, the values determined for COD and sulfate in the rain season and dry season were not statistically different (P < 0.05), however the concentration of BOD 5 , TN, TP, TKN, and phosphate showed significant variation. While the concentrations of TN in the present study were greater than the contents reported by Bilgin et al [36], comparable values for COD, lower values for TN and BOD 5 , and higher TP were observed compared to Henze and Comeau [37]. In contrast, COD and BOD 5 in the present study were found higher than the values in the literature for domestic wastewaters [35,38].…”

Section: Salinity and Heavy Metal Contents Of The Wastewatercontrasting

confidence: 56%

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Amare

Kebede

Kloos

et al. 2017

Water Conserv Sci Eng

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Water is becoming a scarce resource in terms of quantity and quality. Water supply enhancement measures are being taken with less attention given to wastewater management, leading to increased discharge of untreated wastewaters. Wastewater is emerging as an affordable and reliable alternative water supply for urban agriculture, supporting thousands of farmers. Extensive use of untreated wastewater for irrigation will without a doubt lead to accumulation of heavy metals in soils and crops, resulting in overwhelming risks to both public health and the environment. This paper deals with determination of the strength and compositions of the wastewater from a public university in the tropical semiarid region for rainy and dry seasons, based on a number of key parameters including heavy metals. Furthermore, it identified the real advantages of treated water use and issues pertaining to untreated wastewaters use for irrigation purposes. An independent t test showed significant differences in concentrations of all the tested metals, excluding lead, copper, and cadmium during dry and wet seasons. Similarly, differences were significant for electrical conductivity, biological oxygen demand, total nitrogen and total phosphorus. Salinity and concentrations of organics, nutrients, copper, cadmium, iron, manganese and to some extent copper exceeded the allowable thresholds for irrigation water. Lead, zinc, nickel and chromium, on the other hand, were lower than their respective limits. Wastewater used for irrigation purposes is unsafe, and urgent policy interventions on the use of untreated wastewater are required.

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Section: Salinity and Heavy Metal Contents Of The Wastewatercontrasting

confidence: 56%

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Amare

Kebede

Kloos

et al. 2017

Water Conserv Sci Eng

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“…Nitrogen not only affects the water quality, but also contributes to water eutrophication [1], especially in lakes and rivers [2]. Therefore, N removal from wastewater has become a topic of growing concern, both in China and worldwide [3,4].…”

Section: Introductionmentioning

confidence: 99%

Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model

Cui

Zhang

et al. 2016

Water

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Abstract:We monitored the water quality and hydrological conditions of a horizontal subsurface constructed wetland (HSSF-CW) in Beijing, China, for two years. We simulated the area-based constant and the temperature coefficient with the first-order kinetic model. We examined the relationships between the nitrogen (N) removal rate, N load, seasonal variations in the N removal rate, and environmental factors-such as the area-based constant, temperature, and dissolved oxygen (DO). The effluent ammonia (NH 4 + -N) and nitrate (NO 3 − -N) concentrations were significantly lower than the influent concentrations (p < 0.01, n = 38). The NO 3 − -N load was significantly correlated with the removal rate (R 2 = 0.96, p < 0.01), but the NH 4 + -N load was not correlated with the removal rate (R 2 = 0.02, p > 0.01). The area-based constants of NO 3 − -N and NH 4 + -N at 20 • C were 27 ± 26 (mean ± SD) and 14 ± 10 m·year −1 , respectively. The temperature coefficients for NO 3 − -N and NH 4 + -N were estimated at 1.004 and 0.960, respectively. The area-based constants for NO 3 − -N and NH 4 + -N were not correlated with temperature (p > 0.01). The NO 3 − -N area-based constant was correlated with the corresponding load (R 2 = 0.96, p < 0.01). The NH 4 + -N area rate was correlated with DO (R 2 = 0.69, p < 0.01), suggesting that the factors that influenced the N removal rate in this wetland met Liebig's law of the minimum.

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“…The process leading to TN removal is mostly bacterial denitrification transformations, under the anaerobic conditions [27]. The denitrification efficiency of treating high-nitrate waters with low organic carbon has been shown that it depends on C:N ration, and the peak efficiency occurs at C:N ration>5:1 [28][29][30]. So the total The temperature is between 22-30℃.…”

Section: Secondary Effluent Wastewater Post-treatment Using Bio-filtermentioning

confidence: 99%

Domestic sewage and secondary effluent treatment using vertical submerged biological filter

Yang

Tong

Song

et al. 2017

IOP Conf. Ser.: Earth Environ. Sci.

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Abstract. Biological filter (bio-filter) exhibits a high potential for sustainability because construction and maintenance cost are low. When bio-filters are used as pre-treatment or post-treatment technology, other treat steps in the combined treat process could prevent clogging and get better process stability and performance efficiency. This study considered bio-filters for reducing the amounts of various wastewaters, i.e., high-strength sewage, municipal wastewater and secondary effluent water, using five kinds of media. The results obtained indicate significant improvement in organics removal when influent COD are 1500 mg/L and 2500 mg/L for anaerobic and aerobic biofilters, respectively. Sufficient alkalinity would obviously improve the substrate removal in an anaerobic bio-filter, when treating high-strength wastewater. The performances of bio-filters are adequate for further removal of the residual organic material and nutrient elements for tertiary domestic wastewater treatment.

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Treatment of domestic wastewater using a lab-scale activated sludge/vertical flow subsurface constructed wetlands by using Cyperus alternifolius

Cited by 42 publications

References 19 publications

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Wastewater Confronting Realities for Sustainable Livelihood in Developing Countries: Case Study Mekelle University, Ethiopia

Nitrogen Removal in a Horizontal Subsurface Flow Constructed Wetland Estimated Using the First-Order Kinetic Model

Domestic sewage and secondary effluent treatment using vertical submerged biological filter

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