Post-Digestion Liquor Treatment in the Method Combining Chemical Precipitation with Reverse Osmosis

Kuglarz, Mariusz; Grűbel, Klaudiusz; Bohdziewicz, Jolanta

doi:10.2478/aep-2014-0030

Cited by 4 publications

(3 citation statements)

References 38 publications

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“…Ca and Mg contents were on the level of 17.2 ± 3.7 mg/g TS and 5.8 ± 0.9 mg/g TS, respectively (Table 1). According to the literature, the wasteactivated sludge after mesophilic anaerobic digestion was characterized by lower Ca and Mg concentrations, amounting to the level of 1.2-1.7 mg Ca/g TS and 0.64-0.95 mg Mg/g TS [34]. The addition of CaO to the centrifuged sludge resulted in a reduction in organic matter expressed as volatile solids from 71.9 ± 1.3% TS in centrifuged sludge to 39.4 ± 0.9% TS and as TOC from 204 ± 21 mg/g TS to 107 ± 19 mg/g TS.…”

Section: Resultsmentioning

confidence: 99%

Possibilities of Biogas Upgrading on a Bio-Waste Sorbent Derived from Anaerobic Sewage Sludge

et al. 2022

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The development of biogas upgrading technologies is now an essential issue in recovering fuel-grade methane. Nowadays, trends in biogas upgrading include investigations of low-cost and renewable materials as sorbents for biogas enrichment to produce biomethane. Therefore, in this work, wastewater anaerobic sludge stabilized with calcium oxide was used as the bio-waste sorbent to capture carbon dioxide from biogas, employing a fixed bed column. The biogas flow rate was the parameter considered for examining the breakthrough responses. It was observed that breakthrough time decreases with increasing biogas inflow rate from 570 ± 10 min at 5 mL/min to 120 ± 12 min at 35 mL/min. The maximum sorption capacity of 127.22 ± 1.5 mg CO2/g TS of sorbent was estimated at 15 mL/min. Biomethane concentration in biogas increased from 56.5 ± 1.7 v% in the raw biogas to 98.9 ± 0.2 v% with simultaneous low carbon dioxide content of 0.44 ± 0.2 v%. A strong positive correlation (R2 = 0.9919) between the sorption capacity and the biogas flow rate was found in the range of biogas inflow rates between 5 mL/min and 15 mL/min. Moreover, the correlation analysis showed a strong negative relationship (R2 = 0.9868) between breakthrough time and the mass of carbon dioxide removal, and the biogas flow rates ranged from 10 mL/min to 20 mL/min.

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Section: Resultsmentioning

confidence: 99%

Possibilities of Biogas Upgrading on a Bio-Waste Sorbent Derived from Anaerobic Sewage Sludge

et al. 2022

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“…The theoretical molar ratio at which struvite precipitation occurs is 1:1:1 (NH 4 + :PO 4 3-:Mg 2+ ). However, in practice, the possibility of precipitation of struvite at various molar ratios (other than 1:1:1) has also been noticed by other scientists in their research (Kuglarz et al 2014).…”

Section: Introductionmentioning

confidence: 84%

Archives of Environmental Protection

Czajkowska¹,

Malarski²,

Siwiec³

2019

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The complexity and uncontrolled formation of struvite (MgNH 4 PO 4 •6H 2 O) and its deposition in the technological equipment of wastewater treatment plants (WWTPs) are still the subject of research aimed at understanding the causes and proposing a remedial action. In order to reduce the intensity of the precipitation of struvite in wastewater treatment plants, it is recommended, among others, to limit fl ow velocity to below 1.5 m•s -1 . Literature analysis showed that there are no studies on the precipitation of struvite deposits in pipelines. Most studies focus on the deliberate precipitation of struvite, for example phosphorus recovery, resulting in a molar ratio of 1:1:1 (NH 4 + :PO 4 3-:Mg 2+ ). In fact, in WWTPs, such concentrations do not occur, but there have been cases of the precipitation of this mineral (and its mixtures) in the sludge parts. In this paper, the study aimed at determining conditions for the precipitation of deposits with a signifi cant participation of struvite on the inner walls of steel pipes. The study was conducted at a non-stoichiometric concentration of ingredients at different pH values, as well as under dynamic conditions with fl ow velocity below 1.5 m•s -1. A mathematical formula (ANOVA) that can be used to determine the mass of deposits in relation to the concentration of ammonium, phosphate, pH and fl ow velocity was developed. Computational models were developed on to investigate struvite precipitation under different pH levels (8.0-9.5) and ionic concentrations. The studies were carried out on solutions containing ammonium (NH 4 + ), phosphate (PO 4 3-), and magnesium (Mg 2+ ), at a fl ow velocities of 0.4, 0.9 and 1.4 m•s -1 . In order to determine the mathematical formula thanks to which the mass of precipitates can be determined, a special pilot study installation was constructed. The XPS surface analysis of sludge from sewage treatment plants showed a similar composition of compounds with sediments obtained in own research. The presence of struvite was suggested, but the share of atomic percentage of bonds to which struvite was classifi ed is small and amounts to less than 4%. This means that sediments precipitated in the technological installations are a mixture of various compounds of which pure struvite may constitute only a small part.

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“…Disintegration is a process of destroying the structure of the sludge, which involves fragmenting of flocs, destruction of cells of microorganisms and releasing organic substances, inorganic substances and extracellular polymers into the supernatant of the sludge (Yu et al 2008; Grübel et al 2014). Sewage sludge pretreatment uses a variety of disintegration methods, such as high pressure (Gogate et al 2001; Mirota et al 2011); mechanical (Müller 2000; Wett et al 2010); microwave (Kuglarz et al 2014; Yi et al 2014); ultrasound energy (Şahinkaya and Sevimli 2013; Zhou et al 2015; Aylin Alagöz et al 2018); chemical methods—ozonisation (Ak et al 2013; Silvestre et al 2015; Carbajo et al 2016; Xu et al 2018), alkalisation (Yan et al 2013; Suschka et al 2015; Silvestri et al 2018a), acidification (Wang et al 2014; Li et al 2016; Parthiba Karthikeyan et al 2018) and oxidation technique (Zhang et al 2015; Lu et al 2016; Wacławek et al 2017; Kim et al 2018); biological methods—enzymes (Jang et al 2014; Kavitha et al 2014; Lü et al 2016; Gebreeyessus and Jenicek 2016; Ali et al 2018) and thermal methods (heat pretreatment, freezing/thawing) (Montusiewicz et al 2010; Carrère et al 2010; Nowicka and Machnicka 2015; Pilli et al 2015; Liu et al 2018); and hybrid methods (a combination of at least two disintegration techniques) (Zhang et al 2012; Uma Rani et al 2014; Grübel and Suschka 2015; Suschka and Grübel 2016; Grübel et al 2018).…”

Section: Introductionmentioning

confidence: 99%

Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations

Machnicka

Grűbel

Sikora

2019

Environ Sci Pollut Res

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The freezing process consists of dissipating heat from the product until the final temperature is lower than the temperature of crystallisation of that product. Freezing can be used for numerous applications, including for disruption of waste-activated sludge (WAS). The aim of this study was to calculate the estimated amount of heat conveyed between the solidified carbon dioxide and the WAS, in the following ratios: 0.25:1; 0.5:1; 0.75:1 and 1:1. In heat of phase transformations, dry ice sublimation, water solidification, the amount of heat transferred by other substances and heat transferred from the sludge (dry sludge) were taken into account during the process of WAS freezing. Heat changes on the surface of WAS were registered using a thermovision camera. The effectiveness of WAS disintegration was confirmed by several biochemical parameters such as soluble chemical oxygen demand (increase over 14 times), degree of disintegration (48%), proteins (increase over 5 times), carbohydrates (increase almost 7 times), RNA (increase by 2.23 mg L−1), ammonia nitrogen (increase over 23 times), phosphates (increase almost 27 times) and turbidity (increased over 7 times). It was found that dry ice pretreatment of WAS can be an intriguing alternative for the conventional methods used.Electronic supplementary materialThe online version of this article (10.1007/s11356-019-05889-2) contains supplementary material, which is available to authorized users.

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Post-Digestion Liquor Treatment in the Method Combining Chemical Precipitation with Reverse Osmosis

Cited by 4 publications

References 38 publications

Possibilities of Biogas Upgrading on a Bio-Waste Sorbent Derived from Anaerobic Sewage Sludge

Possibilities of Biogas Upgrading on a Bio-Waste Sorbent Derived from Anaerobic Sewage Sludge

Archives of Environmental Protection

Waste-activated sludge disruption by dry ice: bench scale study and evaluation of heat phase transformations

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