Enhancing combined biological nitrogen and phosphorus removal from wastewater by applying mechanically disintegrated excess sludge

Żubrowska-Sudoł, Monika; Walczak, Justyna

doi:10.1016/j.watres.2015.02.041

Cited by 62 publications

(22 citation statements)

References 28 publications

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“…That, in turn, can improve the lower heating value (LHV) of the treated material. As part of inorganic matter is removed during HTC [9], it can be used for the recovery of nutrients, which is currently a problem with digestates from anaerobic digestion of various materials, such as sewage sludge [28,29]. Among liquid by-products, a wide variety of condensable compounds (liquid at ambient conditions) can be simultaneously produced.…”

Section: Introductionmentioning

confidence: 99%

Treatment of Liquid By-Products of Hydrothermal Carbonization (HTC) of Agricultural Digestate Using Membrane Separation

et al. 2020

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Agriculture affects both the quantity and the quality of water available for other purposes, which becomes problematic, especially during increasingly frequent severe droughts. This requires tapping into the resources that are typically neglected. One such resource is a by-product of anaerobic digestion, in which moisture content typically exceeds 90%. Application of hydrothermal carbonization process (HTC) to this residue could partially remove organic and inorganic material, improve dewatering, decrease the overall solid mass, sanitize the digestate, change its properties, and eliminate problems related with emissions of odors from the installation. However, a significant gap still exists in terms of the dewatering of the hydrochars and the composition of the effluents. This work presents results of experimental investigation focused on the removal of organic compounds from the HTC effluent. Results of qualitative and quantitative analysis of liquid by-products of HTC of the agricultural digestate showed that acetic acid, 3-pyridinol, 1-hydroxyacetone, and 1,3-propanediol were the main liquid organic products of the process. Application of ultrafiltration process with the use of 10 kDa membrane for liquid HTC by-product treatment allows for the reduction of chemical oxygen demand up to 30%, biological oxygen demand up to 10%, and dissolved organic carbon up to 21%.

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Section: Introductionmentioning

confidence: 99%

Treatment of Liquid By-Products of Hydrothermal Carbonization (HTC) of Agricultural Digestate Using Membrane Separation

et al. 2020

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“…SCOD/STP for other ϵ L values, in most of the conducted tests, were significantly higher (apart from tests T1 and T4) than those obtained by Kampas et al These authors noticed that because of the relatively low SCOD/STP values in disintegrated sludge, using it as a source of organic carbon to improve nutrient removal from wastewater, can lead to deterioration in phosphorus removal. However, in previous study it was shown that even if SCOD/STN and SCOD/STP of disintegrated sludge was in the range of 9.36 ± 1.27 and 19.59 ± 4.63, respectively, using the sludge as an alternative organic carbon source allowed to increase the effectiveness of denitrification and biological phosphorus removal by 27.0 and 68.1%, respectively (research was conducted in a laboratory scale sequencing batch reactor). Further studies will be conducted to find minimal values of SCOD/STN and SCOD/STP of disintegrated sludge, at which the disintegrated sludge could be used as a carbon source for enhancement of denitrification and biological P removal (which will not worsen the treated wastewater quality).…”

Section: Resultsmentioning

confidence: 98%

“…Moreover, disintegration can improve sludge dewaterability . Sludge disintegration is also referred to as a method of obtaining an alternative carbon source for intensifying nutrient removal from wastewater …”

Section: Introductionmentioning

confidence: 99%

“…[4] Sludge disintegration is also referred to as a method of obtaining an alternative carbon source for intensifying nutrient removal from wastewater. [1,[5][6][7] There are many ways of conducting sludge disintegration, and they differ by the source of energy entering the system, for example, mechanical (ultrasound, ball mills, homogenization, pressure methods, hydrodynamic disintegration [HD]), [1,6,[8][9][10][11] physical (high temperature), [12] chemical (hydrolysis, ozone treatment), [13] and biological. [14] A combination of two or more methods is also used.…”

Section: Introductionmentioning

confidence: 99%

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Influence of Hydrodynamic Disintegration on the Release of Organic and Nutrient Compounds From Activated Sludge

Walczak

Żubrowska-Sudoł

Piechna

2017

CLEAN Soil Air Water

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The aim of the research is to assess the release of organic compounds and nutrients to liquid phase as a result of hydrodynamic disintegration (HD) of sludge. Six batch disintegration tests are conducted. The scope is a complex analysis of the release of organic compounds (soluble chemical oxygen demand [SCOD], volatile fatty acids [VFA]) and nutrients (soluble total nitrogen [STN], NO2−‐N, NO3−‐N, NH4+‐N, soluble total phosphorus [STP], PO43–‐P) depending on the energy density (ϵL) used during the HD process (70–350 kJ L−1). It is shown that an increase in ϵL is correlated with an increase in the disintegration degree (DD). This results in an increase in both the SCOD (including VFA) and in the soluble nutrient concentration (STN and STP). The value of ϵL, at which HD is conducted, also has an influence on the percentage share of VFA in soluble organic compounds released from activated sludge flocs and on the relationship between the SCOD/STN and SCOD/STP ratio. It is also shown that ϵL and the total solids concentration of disintegrated sludge have an influence on the costs of organic compounds acquired by the HD method. Low costs are obtained for ϵL = 350 kJ L−1 (0.7–2.2 € kg−1 SCOD and 12.8–23.64.0 € kg−1 VFA), and for relatively high total solids (TS) concentrations (TS > 4%) (1.5–1.9 € kg−1 SCOD for ϵL = 70 kJ kg−1 and 0.7–0.8 € kg−1 SCOD for ϵL = 350 kJ L−1).

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“…Wśród pozytywnych aspektów wymienia się przed wszystkim: zwięk-szenie efektywności procesu fermentacji metanowej [Petkovšek et al 2015], zmniejszenie obję-tości powstających osadów ściekowych [Yan et al 2013], uzyskanie lepszych efektów odwadniania osadów przefermentowanych [Huan et al 2009], a także intensyfikację usuwania ze ście-ków związków biogennych [Meng et al 2013, Żubrowska-Sudoł andWalczak 2015].W wyniku procesu dezintegracji dochodzi do zniszczenia kłaczkowatej struktury osadu, rozbicia zewnątrzkomórkowych substancji polimerycznych oraz uszkodzenia komórek i ich lizy, co skutkuje zmianami właściwości fizyko-che- …”

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Deactivation of the Activated Sludge as a Result of Mechanical Disintegration

Szatyłowicz¹,

Walczak²,

Żubrowska-Sudoł³

et al. 2017

Inż. Ekolog.

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WSTĘPZe względu na liczne korzyści, proces dezintegracji osadów ściekowych znajduje coraz szersze zastosowanie w ciągu technologicznym oczyszczalni ścieków. Wśród pozytywnych aspektów wymienia się przed wszystkim: zwięk-szenie efektywności procesu fermentacji metanowej [Petkovšek et al. 2015], zmniejszenie obję-tości powstających osadów ściekowych [Yan et al. 2013], uzyskanie lepszych efektów odwadniania osadów przefermentowanych [Huan et al. 2009], a także intensyfikację usuwania ze ście-ków związków biogennych [Meng et al. 2013, Żubrowska-Sudoł andWalczak 2015].W wyniku procesu dezintegracji dochodzi do zniszczenia kłaczkowatej struktury osadu, rozbicia zewnątrzkomórkowych substancji polimerycznych oraz uszkodzenia komórek i ich lizy, co skutkuje zmianami właściwości fizyko-che- DEACTIVATION OF THE ACTIVATED SLUDGE AS A RESULT OF MECHANICAL DISINTEGRATION ABSTRACTThe aim of the study was to analyse the impact of hydrodynamic disintegration of thickened excess activated sludge, performed at different levels of energy density (70, 140, 210 280 and 350 kJ/l), on the respiratory activity of microorganisms. For this purpose the oxygen uptake rate test (OUR) was used. The experiment also included determination of the sludge disintegration degree (DD). Studies have shown, that the value of the energy density and sludge disintegration degree affected the respiratory activity of microorganisms. With a relatively low DD, below approx. 9% (corresponding to an energy density of approx. 140 kJ/l), increase of microbial activity was observed (6,2−30,2%), as compared with untreated sludge. However, above this value of DD, inactivation of microorganisms occurred. Deactivation of microorganisms higher than 85 % was observed when the sludge disintegration degree was greater than approx. 24% (corresponding to an energy density of approx. 210 kJ/l).

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Enhancing combined biological nitrogen and phosphorus removal from wastewater by applying mechanically disintegrated excess sludge

Cited by 62 publications

References 28 publications

Treatment of Liquid By-Products of Hydrothermal Carbonization (HTC) of Agricultural Digestate Using Membrane Separation

Treatment of Liquid By-Products of Hydrothermal Carbonization (HTC) of Agricultural Digestate Using Membrane Separation

Influence of Hydrodynamic Disintegration on the Release of Organic and Nutrient Compounds From Activated Sludge

Deactivation of the Activated Sludge as a Result of Mechanical Disintegration

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