Characterization of phosphorus species distribution in waste activated sludge after anaerobic digestion and chemical precipitation with Fe3+ and Mg2+

Li, Lin; Pang, Heliang; He, Junguo; Zhang, Jie

doi:10.1016/j.cej.2019.05.146

Cited by 78 publications

(18 citation statements)

References 37 publications

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“…At a double dose of MgO, the lowest efficiency of phosphorus precipitation was obtained at the uncontrolled pH (66.59% ± 2.08), at reactions from 8 to 12 pH, this efficiency varied between 79 and 85%. Studies by Li et al 35 indicate that 10 pH promotes phosphorus precipitation with magnesium ions with an efficiency of 90-98% at a Mg/P ratio of 1-1.8. However, the mere addition of Mg, without raising the pH, resulted in a very low recovery efficiency of phosphorus precipitation (about 50% at Mg/P ratio of 1.8).…”

Section: Phosphorus Precipitationmentioning

confidence: 99%

Biological release of phosphorus is more efficient from activated than from aerobic granular sludge

Cydzik‐Kwiatkowska

Nosek

2020

Sci Rep

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Sewage sludge is a rich source of phosphorus. The kinetics of orthophosphate release and the efficiency of phosphorus recovery from aerobic granular sludge (GS) and activated sludge (AS) were compared at external organics (F) to biomass (M) ratios that ranged from 0 to 0.10. Changes in the F/M ratio affected orthophosphates release from AS to a greater extent than their release from GS. On average, increasing the F/M ratio by 0.02 increased the rate of phosphorus release from AS and GS by 2.12 and 1.75 mg P/(L h), respectively. Phosphorus release was highest at an F/M ratio of 0.04 (114.03 and 60.71 mg P/L from AS and GS, respectively). The efficiency of phosphorus recovery from AS ranged from 51.3 to 56.1%; the efficiency of its recovery from GS ranged from 32.8 to 37.5%. From GS, mostly inorganic phosphorus was released (about 8.5 mg/g MLSS), most of which was NAIP, i.e. phosphorus bound to Fe, Mn and Al. At a stoichiometric dose of MgO to PO43−, the precipitation efficiency was 30.13% ± 4.51 with uncontrolled pH and reached 81.73% ± 0.17 at a controlled pH of 10.

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Section: Phosphorus Precipitationmentioning

confidence: 99%

Biological release of phosphorus is more efficient from activated than from aerobic granular sludge

Cydzik‐Kwiatkowska

Nosek

2020

Sci Rep

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“…Dyes play an important role in various industries, including textile, leather, printing, plastic, cosmetics, paper, pharmaceuticals, and food. The existence of dyes in industrial effluents is an environmental issue because of their high visibility, stability, and toxicity 3 . Even low concentrations of dyes in water are detectable and can inhibit photosynthetic activities and the growth of aquatic plants by suppressing the penetration of light and oxygen 4 .…”

Section: Introductionmentioning

confidence: 99%

“…The existence of dyes in industrial effluents is an environmental issue because of their high visibility, stability, and toxicity. 3 Even low concentrations of dyes in water are detectable and can inhibit photosynthetic activities and the growth of aquatic plants by suppressing the penetration of light and oxygen. 4 In addition, commercial dyes have shown carcinogenic and mutagenic effects and can cause skin irritation, allergies, and heart defects.…”

Section: Introductionmentioning

confidence: 99%

“…This dye is also used as an antifungal, anti-parasitic, and antibacterial agent in aquaculture. 7,8 Different treatment methods such as ion exchange, 9 coagulation/ flocculation, 10 chemical precipitation, 3 electrochemical reaction, 11 reverse osmosis, 12 membrane filtration, 13 advanced oxidation, 14 enzymatic degradation, 15,16 and adsorption 17,18 have been used to treat the dye-containing effluents. However, some of these mentioned methods have low efficiency and high cost, which make them inappropriate to be used by small-scale industries.…”

Section: Introductionmentioning

confidence: 99%

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A novel functionalized chitosan nanoadsorbent for efficient elimination of malachite green from aqueous media

Tohidi

Chaibakhsh

Mohammadi

2020

Env Prog and Sustain Energy

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In this study, a novel chitosan‐based nanoadsorbent has been synthesized by the reaction between nanochitosan and epoxy‐triazinetrione. The commercial cationic dye, malachite green, was chosen as a model dye in order to inspect the adsorption efficiency of the prepared adsorbent. The kinetics and thermodynamics of the adsorption process have been explored. According to the results, the Freundlich isotherm and pseudo‐second‐order model can well elucidate the adsorption process. The obtained thermodynamic parameters indicated that the removal process was spontaneous and endothermic (ΔH° = 95.0 kJ mol−1). The effects of several parameters on the dye elimination were studied using the response surface methodology approach. A high adsorption efficiency (95%) was obtained at 29.5 min, pH 7.9, and 7.5 mg of the adsorbent. At this condition, the removal efficiency of the unmodified adsorbent was 65.4%. The novel epoxy‐triazinetrione‐modified chitosan nanosorbent was found to be highly adequate for the treatment of wastewaters containing organic dyes.

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“…The scanning electron microscopy (SEM) coupled with energy dispersive spectrometer (EDS) (Hitachi S-4800, Japan) was used to analyze the micromorphology and elemental composition of recovered precipitates, while X-ray diffraction (XRD) (Bruker D8, Germany) was employed to determine the crystallographic structure of recovered precipitates with a scan rate of 6°/min in the scanning range (2θ) of 10-90° (Li et al, 2019). Co targets were used for XRD detection due to the magnetic properties of the samples.…”

Section: Characterization Of the Recovered Precipitatesmentioning

confidence: 99%

Phosphorus recovery from waste activated sludge by sponge iron seeded crystallization of vivianite and process optimization with response surface methodology

Zeng

et al. 2021

Environ Sci Pollut Res

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As a novel phosphorus recovery product, vivianite (Fe 3 (PO ) 2 •8H 2 O) has attracted much attention due to its enormous recycling potential and foreseeable economic value. Taking sponge iron as seed material, the effect of different reaction conditions on the recovery of phosphorus in waste activated sludge by vivianite crystallization was studied. Through single factor test, the optimal conditions for vivianite formation were in the pH range of 5.5-6.0 with Fe/P molar ratio of 1.5. Scanning electron microscopy (SEM), powder X-ray diffraction (XRD) and energy dispersive spectroscopy (EDS) were used to analyze the components of the crystals. The results showed that the vivianite produced with sponge iron as the seed crystal were larger and thicker (300-700 μm) than other seed (200-300 μm) and without seed (50-100 μm). Moreover, vivianite, which was synthesized with sponge iron as seed, was obviously magnetic and could be separated from sludge by rubidium magnet. The Box-Behnken design of the response surface methodology was used to optimize the phosphorus-recovery process with sponge iron (maximum phosphorus recovery rate was 83.17%), and the interaction effect of parameters was also examined. PH had a signi cant effect on the formation of vivianite. In summary, this research veri es the feasibility of using sponge iron as seed crystal to recover phosphorus in the form of vivianite from waste activated sludge, which is conducive to the subsequent separation and utilization of vivianite.

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Characterization of phosphorus species distribution in waste activated sludge after anaerobic digestion and chemical precipitation with Fe3+ and Mg2+

Cited by 78 publications

References 37 publications

Biological release of phosphorus is more efficient from activated than from aerobic granular sludge

Biological release of phosphorus is more efficient from activated than from aerobic granular sludge

A novel functionalized chitosan nanoadsorbent for efficient elimination of malachite green from aqueous media

Phosphorus recovery from waste activated sludge by sponge iron seeded crystallization of vivianite and process optimization with response surface methodology

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