Effects and mechanisms of calcium peroxide on purification of severely eutrophic water

Wang, Yi; Wang, Wen-Huai; Yan, Fei-Long; Ding, Zhuo; Feng, Lishuang; Zhao, Jingchan

doi:10.1016/j.scitotenv.2018.10.040

Cited by 56 publications

(9 citation statements)

References 29 publications

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“…In addition, after flowing through the reactor at the above three different phosphorus concentrations of the actual river water with an initial DO concentration of 5.3 mg L À1 , the concentration of DO in effluent was raised to 7.0 mg L À1 , 8.3 mg L À1 , and 8.5 mg L À1 , respectively (Figure 5(b)). Moreover, it is well known that high pH would inhibit the activities of aquatic organisms (Wang et al 2019). As shown in Table 2, when ORPC was applied, the pH of the above three different phosphorus concentrations of actual river water were increased from 7.57, 7.62, and 8.03 to 8.18, 8.41, and 9.31, respectively, which was similar to the pH change observed by Zhang et al (2012).…”

Section: Orpc Purification Test For the Actual River Watersupporting

confidence: 83%

Preparation and application of an innovative integrated agent product for phosphorus control and oxygen release

Zhou

Liu

et al. 2021

Water Supply

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In this study, an oxygen-releasing and phosphorus-controlling agent (ORPC) consisting of calcium peroxide (CaO2), bentonite, cement, stearic acid (SA), citric acid (CA) and fine sand was synthesized successfully and used to purify rich-phosphorus river water. The removal of phosphorus using ORPC was studied in actual river water and the results found that over 75.0% phosphorus was removed by adding ORPC at 30 mL h−1 flow rate in the initial phosphorus concentrations of 0.76 mg L−1. The ORPC was further used to evaluate the changes of aluminum phosphate (Al-P), ferric phosphate (Fe-P) and calcium phosphate (Ca-P) in sediment. Fe-P, Al-P, and Ca-P in the sediment increased from 0.14, 0.196, and 1.63 mg g−1 to 0.159, 0.372, and 2.74 mg g−1 respectively within 28 days, indicating that the total dissolved phosphorus in the overlying water could be adsorbed by ORPC and further transformed into Al-P, Ca-P, and Fe-P in the sediment, thus inhibiting the release of endogenous phosphorus in sediment to water. Besides, the performance of ORPC with various contents of SA and CaO2 was investigated. In summary, ORPC can be employed to adsorb phosphorus in water and prevent phosphorus release from sediment, therefore achieving the purpose of controlling phosphorus and maintaining DO at a reasonable level.

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Section: Orpc Purification Test For the Actual River Watersupporting

confidence: 83%

Preparation and application of an innovative integrated agent product for phosphorus control and oxygen release

Zhou

Liu

et al. 2021

Water Supply

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“…In this situation, organic bio-carriers can provide both support to microbial growth and a substrate for plant growth (Wang et al 2019). As a result, there has been an upsurge in the use of bio-carriers to absorb pollutants (nitrogen and phosphorus) as well as to improve the efficacy of an ecological floating bed in eutrophic water purification (Guo et al 2019).…”

Section: Introductionmentioning

confidence: 99%

Designing efficient floating bed options for the treatment of eutrophic water

Nandy

Kalra

Kapley

2022

Journal of Water Supply: Research and Technology-Aqua

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Developing solutions for lake eutrophication has emerged as a priority area to address the loss of ecosystem balance, reduction in aquatic biodiversity, and the potential production of toxins. Floating bed solutions offer an effective methodology to address this issue. This study uses rice straw as a base for floating bed treatment. Treatment of simulated eutrophic water was analyzed with and without plants in combination with rice straw beds (RS and RS + P). Treatment efficiency was also tested under increased aeration conditions (RS + A). Results demonstrated that average removal efficiencies of the ecological beds assembled with plant and aerator ranged from 81 to 82%, 80 to 85%, 78 to 86%, 61 to 69% for COD, NH4+-N, NO3−-N, and phosphates, respectively. The microbial community structure was also analyzed from the water samples taken from ecological beds assembled with plant and aerator by 16S rRNA gene sequencing. Based on the above results, systems assembled with plants and aerators proved to be efficient for the treatment of eutrophic water.

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“…There are several possible methods of reducing internal P release in sediments, including artificial aeration; chemical applications, such as flocculation precipitation or adding Fe, Al or Ca-based agents; and sediment capping [10,16]. The application of CaO 2 effectively controlled the release of N and P from the sediment, and the concentrations of N and P in the overlying water were obviously reduced because of the increased microbiological action [44]. Illite is a useful agent for deactivating P for lake eutrophication control, and it has shown high efficiency (> 130%) as the capping material for both soluble reactive phosphorus (SRP) and total phosphorus (TP) [13].…”

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confidence: 99%

The effect of natural materials used as sediment remediation on phosphorus and nitrogen control in a mesocosm

Tang

Deng

et al. 2020

Environ Sci Eur

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Background: Achieving nitrogen (N) and phosphorus (P) control in sediment remediation projects by adding natural materials is receiving increasing attention. In this study, different natural materials, including iron-rich clay minerals, calcite, kaoline, sugarcane bagasse and Phragmites detritus, were applied to test their effects on N and P in a mesocosm experiment. Results: Iron-rich clay minerals and Phragmites detritus had obvious advantages for P control; they resulted in almost undetectable levels of soluble reactive phosphorus (SRP) in the water column throughout the experiment. This finding can be explained by their strong P adsorption ability. The high level of available organic carbon in the sediment and water column after sugarcane bagasse addition provided enough electron donors for denitrification and dissimilatory nitrate reduction to ammonium (DNRA), which caused nitrate (NO 3 −-N) deficiency and ammonium (NH 4 +-N) accumulation in the water column. Additionally, this resulted in anaerobic conditions, further fuelling the release of P from iron-bound P induced by anoxia. Thus, the amount of sugarcane bagasse applied should be considered carefully in order to balance denitrification and DNRA as well as P releases. Calcite and Phragmites detritus are recommended as remediation materials for N removal based on their significant promotion of denitrification and limitation of DNRA, which resulted in low NO 3 −-N and NH 4 +-N levels. These results can be explained by the shifts in the functional microbial community composition and abundance after the addition of natural materials. Conclusions: Iron-rich clay minerals and Phragmites detritus are promising sediment remediation materials for P immobilization due to their strong P adsorption ability. Taken together, the selection of sediment remediation materials should consider the N and P coupling relationship, to prevent NO 3 −-N removal from causing P leaching or NH 4 +-N accumulation.

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Effects and mechanisms of calcium peroxide on purification of severely eutrophic water

Cited by 56 publications

References 29 publications

Preparation and application of an innovative integrated agent product for phosphorus control and oxygen release

Preparation and application of an innovative integrated agent product for phosphorus control and oxygen release

Designing efficient floating bed options for the treatment of eutrophic water

The effect of natural materials used as sediment remediation on phosphorus and nitrogen control in a mesocosm

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