Hybrid algal photosynthesis and ion exchange (HAPIX) process for high ammonium strength wastewater treatment

Wang, Meng; Payne, Karl; Tong, Shuang; Ergas, Sarina J.

doi:10.1016/j.watres.2018.05.043

Cited by 44 publications

(13 citation statements)

References 46 publications

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“…are the nutrient concentrations at day 0 and day 5, respectively. For the nutrient removal efficiency and removal rate during pig urine treatment in continuous mode, results were calculated following Equations (8) and 9:…”

Section: Wastewater Nutrient Analysismentioning

confidence: 99%

“…mg‧L -1 and 288.75 mg‧L -1 , respectively. The high concentration of NH4 + -N was detrimental to algal cells due to the free ammonia [8]. In addition, high levels of salts (Table 1) could also affect the nutrient assimilation and metabolism of microalgae, and even threaten its growth, due to high osmotic pressure [3].…”

Section: Optimization Of C Vulgaris Growth Conditions In Pig Urinementioning

confidence: 99%

“…However, pig urine is not frequently used as medium to culture microalgae due to its inhibitive effect on the microalgae metabolism. The high concentration of NH 4 + -N (≥ 200 mg•L −1 ) in fresh pig urine is toxic to the growth of microalgae due to the formation of free ammonia [8]. This could affect the photosynthetic processes in chloroplasts, electron transport chain, non-photochemical quenching, as well as the dark respiration [9], which can decrease the chlorophyll-A content and cause cell lysis of the microalgae [2,3].…”

Section: Introductionmentioning

confidence: 99%

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Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

et al. 2020

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Fresh pig urine is unsuitable for microalgae cultivation due to its high concentrations of NH4+-N, high pH and insufficient magnesium. In this study, fresh pig urine was pretreated by dilution, pH adjustment, and magnesium addition in order to polish wastewater and produce microalgae biomass. Chlorella vulgaris was cultured in an in-house-designed light-receiving-plate (LRP)-enhanced raceway pond to treat the pretreated pig urine in both batch and continuous mode under outdoor conditions. NH4+-N and TP in wastewater were detected, and the growth of C. vulgaris was evaluated by chlorophyll fluorescence activity as well as biomass production. Results indicated that an 8-fold dilution, pH adjusted to 6.0 and MgSO4·7H2O dosage of 0.1 mg·L−1 would be optimal for the pig urine pretreatment. C. vulgaris could stably accumulate biomass in the LRP-enhanced raceway pond when cultured by both BG11 medium and the pretreated pig urine. About 1.72 g·m−2·day−1 of microalgal biomass could be produced and 98.20% of NH4+-N and 68.48% of TP could be removed during batch treatment. Hydraulic retention time of 7-9d would be optimal for both efficient nutrient removal and microalgal biomass production during continuous treatment.

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Section: Wastewater Nutrient Analysismentioning

confidence: 99%

Section: Optimization Of C Vulgaris Growth Conditions In Pig Urinementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

et al. 2020

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“…The intelligent responsiveness of hydrogels means that they are "smart" soft materials with three-dimensional cross-linked network structures that can change volume/shape or phase in sensitive response to environmental stimulation including temperature, pH, magnetic field, electric field, light, and chemical substances [7][8][9][10][11]. The response characteristics of "smart" hydrogels are important parameters for their wide application in the fields of drug control release and separation, heavy metal adsorption, and biomedical treatments [5,12,13].…”

Section: Introductionmentioning

confidence: 99%

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

et al. 2020

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In this work, the thermo-sensitive materials N-isopropylacrylamide (NIPAM) and acrylic acid (AA) were crosslinked with carboxymethyl cellulose (CMC) (CMC/P (NIPAM-co-AA)) via a free radical polymerization method for the removal of U(VI) from aqueous solution. The L16 (45) orthogonal experiments were designed for the optimization of the synthesis condition. The chemical structures of the crosslinking hydrogel were confirmed by FTIR spectroscopy. The microstructural analyses were conducted though scanning electron microscopy (SEM) to show the pore structure of the hydrogel. The adsorption performance of the CMC/P (NIPAM-co-AA) hydrogel for the uptake of U(VI) from simulated wastewater was also investigated. The adsorption reached equilibrium within 1 h. Under the reaction of pH = 6 and a temperature of 298 K, an initial concentration of U(VI) of 5 mg·L−1, and 10 mg of the CMC/P(NIPAM-co-AA) hydrogel, the maximum adsorption capacity was 14.69 mg g−1. The kinetics fitted perfectly with the pseudo-second-order model, and the isotherms for the composite hydrogel adsorption of U(VI) was in accordance with the Langmuir model. The chemical modification confirmed that the acylamino group played an important role in uranium adsorption. The desorption and reusability study revealed that the resolution rate was still available at approximately 77.74% after five alternate heating cycles at 20 and 50 °C of adsorption-desorption.

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“…These substances penetrate and accumulate inside the bodies through food chains [1]. For the remediation and purification of wastecontaminated water, a number of different strategies were used, which include chemical precipitation [2], ion exchange [3], biological methods [4], membrane separation [5], reverse osmosis [6], coagulation and flocculation [7], catalysis [8][9][10][11], photodegradation [12], and adsorption [13,14]. Among these strategies, adsorption is considered a cheap, quick, and environmental friendly process for wastewater treatment.…”

Section: Introductionmentioning

confidence: 99%

Polymer Hydrogels for Wastewater Treatment

Shah¹,

Khan²

2019

Environmental Chemistry and Recent Pollution Control Approaches

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The pollution of water resources turns into a worldwide problem because of the indiscriminate disposal of pollutants both organic and inorganic in nature. It stays hard to manner or control the purification of wastewater before it flows to water reservoirs. The growing interest in the improvement and application of novel hydrogels in wastewater remedy is due to its particular chemical characteristics along with hydrophilicity, sensitivity, and functionality. Hydrogels exhibit superior overall performance inside the adsorptive removal of a wide variety of aqueous pollutants along with heavy metals, nutrients, and toxic dyes. In this chapter, we are focusing on the behavior and importance of the hydrogels used so far for the removal of both organic and inorganic pollutants from wastewater. With this contribution, we will be able to elaborate the answer for why these hydrogels are superior than other materials used for the same purpose. More attention is given to the removal of heavy metal ions from wastewater using different hydrogel systems.

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Hybrid algal photosynthesis and ion exchange (HAPIX) process for high ammonium strength wastewater treatment

Cited by 44 publications

References 46 publications

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Cultivation of Chlorella vulgaris in a Light-Receiving-Plate (LRP)-Enhanced Raceway Pond for Ammonium and Phosphorus Removal from Pretreated Pig Urine

Fabrication and Optimization of the Thermo-Sensitive Hydrogel Carboxymethyl Cellulose/Poly(N-isopropylacrylamide-co-acrylic acid) for U(VI) Removal from Aqueous Solution

Polymer Hydrogels for Wastewater Treatment

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