Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Spychała, Marcin; Lucyk, P

doi:10.17306/j.npt.2015.3.44

Cited by 8 publications

(6 citation statements)

References 40 publications

(48 reference statements)

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“…The pollution removal efficiency values seem not to be very high but the very short hydraulic retention time should be taken into account and in accordance with this condition these values are comparable to results of another study [Spychała and Łucyk 2015].…”

Section: Highly Changeable Flow-conditions Experimentssupporting

confidence: 89%

“…The acceleration of clogging process rising and decreasing in flow velocity was observed after a particular period of time and then full clogging was observed. This experiment showed a very high percentage of small particles in septic tank effluent.The concentration in cross-sectional profile of filtering different thickness layers was described in detail in other papers Łucyk 2015, Spychała and.Both suspended solids and live biomass (resulting from microbial growth) are suggested to be the causes of clogging process intensification [Koerner and Koerner 1990].The geo-textiles in question can be characterised by several properties. One of the most useful is the opening size, which provides important information related to clogging resistance and filtration properties.…”

mentioning

confidence: 96%

“…The concentration in cross-sectional profile of filtering different thickness layers was described in detail in other papers Łucyk 2015, Spychała and.…”

mentioning

confidence: 99%

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Capacity of Textile Filters for Wastewater Treatment at Changeable Wastewater Level – A Hydraulic Model

Spychała

Pawlak

Nawrot

2016

ASP.FC

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The aim of the study was to describe in a mathematical manner the hydraulic capacity of textile filters for wastewater treatment at changeable wastewater levels during a period between consecutive doses, taking into consideration the decisive factors for flowconditions of filtering media. Highly changeable and slightly changeable flow-conditions tests were performed on reactors equipped with non-woven geo-textile filters. Hydraulic conductivity of filter material coupons was determined. The dry mass covering the surface and contained in internal space of filtering material was then indicated and a mathematical model was elaborated. Flow characteristics during the highly changeable flow-condition test were sensitivity to differentiated values of hydraulic conductivity in horizontal zones of filtering layer. During the slightly changeable flow-conditions experiment the differences in permeability and hydraulic conductivity of different filter (horizontal zones) height regions were much smaller. The proposed modelling approach in spite of its simplicity provides a satisfactory agreement with empirical data and therefore enables to simulate the hydraulic capacity of vertically oriented textile filters. The mathematical model reflects the significant impact of the filter characteristics (textile permeability at different filter height) and operational conditions (dosing frequency) on the textile filters hydraulic capacity.M. Spychała, M. Pawlak, T. Nawrot 422There are many factors and conditions related to non-woven geo-textile hydraulic conductivity and clogging. Some of these are well known: fibre density [Marks 1975], filtered suspension particle size [Gourc and Faure 1990] and organic material growth or deposition [Hoogerdendorn and Van der Meulen 1977].The studies conducted thus far [Spychała et al. 2013] showed a satisfactory pollution removal by textile filters for wastewater treatment (TFWT).The average values of removal efficiencies can seem to be relatively low, however much higher values were observed occasionally under slightly changeable conditions (inflow concentrations): up to 89% for COD, 80% for ammonium nitrogen and up to 48% for total phosphorus. Taking into consideration that this type of filter operates without forced (energy consuming) aeration and sophisticated solutions are not applied, it can be considered as satisfactory in its performance.TFTW hydraulic conditions are complex due to the dosing regimen related to changeable wastewater surface level (which causes changeable hydrostatic pressure). Another flow-related condition is the stratification of biomass (the mixture of live organisms and solids originated from wastewater) concentration and their resistance along the filter layer height (filtering surface is oriented vertically) due to the clogging process. However it is worth noting that the TFWT is a specific filtering medium operating under specific conditions and therefore both internal clogging and surface accumulation (in the form of filter cake) occurs.The form of biomass inside th...

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Section: Highly Changeable Flow-conditions Experimentssupporting

confidence: 89%

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confidence: 96%

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Capacity of Textile Filters for Wastewater Treatment at Changeable Wastewater Level – A Hydraulic Model

Spychała

Pawlak

Nawrot

2016

ASP.FC

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“…four layers instead of one can remove from the septic tank effluent about four times more solids massabout 10÷20% and such a value can be thought as significant in relation to clogging time (two-three years longer operation time). Additionally (it was not investigated during this study but other studies showed this, such as Spychała and Łucyk [39]), the filtering material, especially thicker than 1÷2 mm, can significantly remove dissolved substances such as organic matter.…”

Section: Resultsmentioning

confidence: 90%

Septic Tank Effluent Pretreatment Using Different Filter Materials as a Prevention from Clogging

Nieć

Spychała

Mazurkiewicz

2016

Eng. Prot. Environ.

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Septic tanks are common devices for primary wastewater treatment, however, they are prone to periodically raised effluent solids concentration, which can accelerate the clogging process in specific conditions. The aim of the study was to identify the impact of the secondary filter on the reduction of TS load and possibility to increase the operation time. The study was carried out in two series using six filters. In each series six filters (pipes with filtering material installed on the bottom) were used: three filters with filter mesh and the other three -with non-woven geo-textile. The filters were being filled with wastewater until clogging was achieved (wastewater table in pipes rising up to 50 cm). For the hydraulic conductivity estimation of falling water table tests were performed. Similar values of accumulated TS to dosed TS ratios were observed during the both series for the both filtering material types. The particle size distributions in the both filtering materials were similar. The fact of accumulation of particles of very small dimension (over 73% smaller than 5 µm), much smaller than the filtering material pores diameter might suggest that the process taking place was that of cake filtration. Despite the higher cumulated dry mass of filter cake and inside the filtering layer, the average hydraulic conductivity of non-woven geo-textile was higher than the average hydraulic conductivity of filter mesh. Probably thanks to the higher porosity of geo-textile higher amount of solids can be trapped inside the filtering material itself. The study showed the relatively low ratio of accumulated solids to supplied solids load; however, the accumulated mass seems to be significant for clogging prevention, especially in the case of several filtering layers usage. This way much more solids can be removed from the septic tank effluent (e.g., using four layers -about 10÷20%) and clogging process can be slowed down (two -three years longer operation time).

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“…In the case of nutrients, the removal of most nitrogen and phosphorus forms from sewage became efficient after the startup period of the biological membrane (as a result of biological clogging). The decrease in flows significantly improved the efficiency of wastewater treatment by extending the substrate's contact with the biological membrane [1]. The anaerobic conditions in the filter caused high levels of ammonia nitrogen to be maintained; nevertheless, its reduction in the nonwoven bed is noticeable (Fig.…”

Section: Changes In Phosphate (V) Concentrationsmentioning

confidence: 99%

Efficiency of Nutrient Removal from Household Wastewater in Nonwoven Bioreactors

Chmielowski¹,

Mazur²,

Nowak³

et al. 2019

Pol. J. Environ. Stud.

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Nutrient removal is a very important criterion in household sewage treatment systems. The process of sewage treatment must ensure an adequate degree of nutrient reduction from raw sewage, both in municipal treatment plants and in small treatment plants, below 50 PE [1]. The use of membrane bioreactors (MBR) in the treatment of wastewater is limited to small objects with relatively small organic pollutant load.

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Effect of thickness of textile filter on organic compounds and nutrients removal efficiency at changeable wastewater surface level

Cited by 8 publications

References 40 publications

Capacity of Textile Filters for Wastewater Treatment at Changeable Wastewater Level – A Hydraulic Model

Capacity of Textile Filters for Wastewater Treatment at Changeable Wastewater Level – A Hydraulic Model

Septic Tank Effluent Pretreatment Using Different Filter Materials as a Prevention from Clogging

Efficiency of Nutrient Removal from Household Wastewater in Nonwoven Bioreactors

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