Conditioning, Filtering, and Expressing Waste Activated Sludge

Novak, John T.; Agerbæk, Mikkel L.; Sørensen, Birgitte Lilholt; Hansen, Jens Peter

doi:10.1061/(asce)0733-9372(1999)125:9(816)

Cited by 60 publications

(28 citation statements)

References 8 publications

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“…The filterability of a sludge can be described by the SRF, which is derived from Darcy's law for flow through porous media [7,8]. The rearranged form of this relation, in terms of the inverse filtrate flux, is given in Eq.…”

Section: Determination Of Specific Resistance To Filtration (Srf)mentioning

confidence: 99%

Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-II: laboratory characterizations of drainability and filterability

Ayol

Dentel

2005

Process Biochemistry

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Section: Determination Of Specific Resistance To Filtration (Srf)mentioning

confidence: 99%

Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-II: laboratory characterizations of drainability and filterability

Ayol

Dentel

2005

Process Biochemistry

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“…4 The critical pressure above which the dewatering rate is constant has been determined to be in the range of 5-50 kPa for biological sludge. 5 Operation at pressures above the critical pressure have only a limited effect on separation performance, because cake porosity decreases and hydraulic resistance, therefore, increases with pressure. Gravity drainage, is, thus, an energy-efficient means of dewatering organic waste products as the pressure is close to the critical pressure, so little energy is wasted on cake compression.…”

Section: Introductionmentioning

confidence: 99%

Gravitational drainage of compressible organic materials

et al. 2010

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A model was developed to simulate drainage of compressible particle suspensions, and study how cake compression and volumetric load influence the process. The input parameters were settling velocity, cake resistance and compressibility. These parameters were found using a new experimental method. Dextran-MnO 2 particle suspensions were drained as these resemble organic waste slurries with respect to settling and compressibility. It was demonstrated that cake compressibility must be taken into account to obtain adequate simulations. This implies that pressurized filtration resistances cannot be used for drainage simulations. In the filtration step, a distinct increase of dry matter from top to bottom of the cake was observed. During the subsequent consolidation, the cake compressed and a uniform dry matter profile was found. The final dry matter content of the cake increased with feed concentration and volumetric load. The drainage time increased proportionally with feed concentration and, more importantly, proportionally with squared volumetric load. V V C 2010 American Institute of Chemical Engineers AIChE J, 56: 3099-3108, 2010

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“…Conversely, regarding the mixed liquor, the CST for CAS resulted always lower than the MBR one. The latter circumstance is probably ascribable to the deflocculation effect exerted by the MBR lay-out that significantly affects the dimension of activated sludge flocs [35,36]. On the contrary, regarding the CST of the digested sludge, it was found that such value was higher for CAS than MBR.…”

Section: Resultsmentioning

confidence: 93%

Waste activated sludge dewaterability: comparative evaluation of sludge derived from CAS and MBR systems

Capodici

Mannina

Torregrossa

2016

Desalination and Water Treatment

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Sludge dewatering represents, nowadays, one of the greatest operational cost to wastewater treatment cycle. Physical-chemical and biological parameters are recognized to influence the sludge dewaterability. However, many authors agree in identifying the sludge origin as one of the main aspect involved in sludge dewaterability. Indeed, the sludge origin such as the processes involved in liquid-solid separation, seriously affect the sludge features. In order to elucidate the key factors influencing the dewaterability process, the present work is aimed to investigate the influence of the treatment plant lay-out on sludge dewaterability. The analyzed sludge samples were derived from four conventional activated sludge and two membrane bioreactor wastewater treatment plants. Experimental investigation was focused to highlight difference in sludge dewaterability derived from the application of European Standards adopted for sludge characterization. The achieved results confirmed the complexity of the inter-relationships between many factors affecting the sludge dewaterability.

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Conditioning, Filtering, and Expressing Waste Activated Sludge

Cited by 60 publications

References 8 publications

Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-II: laboratory characterizations of drainability and filterability

Enzymatic treatment effects on dewaterability of anaerobically digested biosolids-II: laboratory characterizations of drainability and filterability

Gravitational drainage of compressible organic materials

Waste activated sludge dewaterability: comparative evaluation of sludge derived from CAS and MBR systems

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