Struvite Formation from Wastewater: Affecting Factors and Nutrient Recovery

Nguyen, T. H. P.; Le, Thi-Hoang-Yen; Le, Thi-Hong-Hanh; Bui, Xuan‐Thanh

doi:10.2478/gse-2018-0002

Cited by 4 publications

(2 citation statements)

References 30 publications

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“…The decrease in phosphate concentration is probably due to the formation of struvite (MgNH4PO4•6H2O). This is supported by the research of Thi Thuy Trang et al (2018) which states that the way to recover phosphate is through the formation of struvite. The results of this study are higher than the research conducted by Tchamango et al (2010), where phosphate recovery, nitrogen content reduction, and turbidity were 89.81% and 100%, respectively.…”

Section: Phosphate and Nitratementioning

confidence: 78%

Nutrient Recovery from Agricultural Waste Water Using Electrocoagulation Process, A Case Study of Thekelan, Semarang, Indonesia

et al. 2022

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Eutrophication is a natural phenomenon in aquatic ecosystems that causes algae and other aquatic plants to overproduce. This process can benefit the ecology in tiny amounts, but too many nutrients can generate hazardous algal blooms and kill fish and other aquatic life. To prevent eutrophication and sustain aquatic ecosystems, agricultural waste water like microalgae production wastewater must be treated. The goal of the project is to get nitrogen and phosphorus out of the wastewater from growing microalgae, which is an agricultural waste water. One way to recover nutrients from wastewater is electrocoagulation. This procedure uses an electric current to create microscopic gas bubbles that collect and remove pollutants from wastewater. According to this study, electrocoagulation reduces phosphate and nitrate in microalgae culture wastewater. Phosphate concentration dropped by 90.20% in the 15th minute, while nitrate concentration dropped by 36.19% in the 30th minute. These reductions may be caused by struvite formation and nitrate conversion to nitrogen gas. This study demonstrates that electrocoagulation is a potential technology for recovering nutrients from agricultural waste water and reducing aquatic ecosystem eutrophication.

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Section: Phosphate and Nitratementioning

confidence: 78%

Nutrient Recovery from Agricultural Waste Water Using Electrocoagulation Process, A Case Study of Thekelan, Semarang, Indonesia

et al. 2022

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“…The phosphate removal was higher than that of previously reported by Tchamango et al (2010) where phosphate reduction as 89.81% 57) . The reduction in phosphate concentration is probably the result of struvite production (MgNH 4 PO 4 •6H 2 O) 58) .…”

Section: Phosphatementioning

confidence: 99%

Harvesting of Dunaliela Salina at Low Concentrations using Spiral Electrocoagulation (SEC)

Purwono,

H. Hadiyanto,

Mochamad Arief Budihardjo

2024

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Harvesting of Dunaliella salina at low concentrations is more difficult to collect and requires special harvesting procedures. This is because the microalgae are more dispersed in the culture medium, making it harder to separate from the medium. When microalgae are harvested, it will produce wastewater that contains excess nutrients such as nitrate and phosphorus. Wastewater of microalgae harvesting should not contain microalgae and excess nutrients. These pollutants cause eutrophication of water bodies and ecosystem destruction when left untreated. The aims of the study were to analyze the harvesting efficiency of D salina at low concentrations and evaluation the nutrients in the wastewater produced from D salina harvesting. In this study, we used spiral electrocoagulation (SEC) with variations in voltage (16, 18, and 20 V) and electrolysis times (1, 3, and 5 min), a surface area of 88.13 cm-2, and a stirring speed of 400 rpm. The response surface method was utilized to optimize operating conditions that were CCD-randomized by five levels of two variables. Harvesting of D salina at low concentrations reached a maximum efficiency of 74.6% when voltage was set to 20 V for five minutes with surface area (Fe) 88.13 cm-2, stirring speed = 400 rpm, current intensity = 2.1 A. The power consumption required to harvest D salina at a low concentration, which is 0.426517 kWh/kg biomass, is higher compared to a higher microalgae concentration. Nutrients (nitrate and phosphate) in the wastewater were successfully reduced by 97 % using SEC within one minute under 20 volts applied.

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