Determining the distribution of granule diameter from biological sludge

In the experimental study was studied the malachite green colorant biodegradation in biological sludge with biological activity. The biodegradability tests were carried out in laboratory bioreactors, on aqueous solutions of green malachite contacted with microorganisms in which the dominant species is Paramecium caudatum, in a pH range between 8 and 12, temperatures in the ranges 25-350C, using pH neutralizing substances and biomass growth promoters. The colorant initial concentrations and those obtained after biological degradation depending on the contact time, at certain pH values, were established through UV-Vis spectrometry. The studies have shown the measure of possible biological degradation of some organic substances with extended uses, with largely aromatic structure, resistance to biodegradation of microorganisms, commonly used in wastewater treatment plants.

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Suivi du fonctionnement d'une station d'epuration associant physico-chimie et biofiltration = Metabief (France)

Water Science & Technology ◽

10.2166/wst.1990.0151 ◽

1990 ◽

Vol 22 (1-2) ◽

pp. 251-259 ◽

Cited By ~ 1

Author(s):

R. Pujol

Keyword(s):

Organic Matter ◽

Biological Process ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Cold Temperatures ◽

Biological Sludge ◽

Physico Chemical ◽

Total Plant ◽

Sludge Characteristic

The sewage treatment plant of Metabief (East of France) has been monitored during three weeks in winter 1988. The treatment associates a physico-chemical treatment with a biological process of biofiltration. The first step eliminates about 60 % of the organic matter (COD and BOD). The biofliters improve the treatment removing 60 % of COD influent and 65 % of TSS. The process is efficient (N excepted) under conditions of the experiment but nitrification is limited by cold temperatures (< 10°C). Important results related to biological sludge product are presented (sludge characteristic, microscopic data, sludge production). Power consumption of biofliters represents 70 % of the total plant needs. Adequate control of washing cycles and close survey of numerous movable devices are of the utmost importance to guarantee the proper operating of biofliters.

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Basic Studies on Phosphorus Removal by the Contact Aeration Process Using Iron Contactors

Water Science & Technology ◽

10.2166/wst.1991.0514 ◽

1991 ◽

Vol 23 (4-6) ◽

pp. 641-650 ◽

Cited By ~ 4

Author(s):

S. Haruta ◽

T. Takahashi ◽

T. Nishiguchi

Keyword(s):

Corrosion Rate ◽

Phosphorus Removal ◽

Domestic Wastewater ◽

Small Scale ◽

Combined Method ◽

Sulfate Reducing ◽

Biological Sludge ◽

Aeration Process ◽

Basic Studies ◽

Volumetric Loading

The authors have developed what we call the submerged iron contactor process as a simple and inexpensive phosphorus removal method for small-scale plants disposing of domestic wastewater and household wastewater treatment tanks. In this method iron contactors are submerged in biological treatment tanks, where phosphate anions in wastewater are combined with iron cations produced through corrosion of the contactors, and the compound thus produced is precipitated and removed together with biological sludge. In these studies, laboratory experiments were made on the contact aeration process combined with the above-mentioned method, and the following findings were obtained. (1) It is desirable to treat wastewater by making use of corrosion by sulfate-reducing bacteria instead of corrosion by oxygen dissolved in wastewater, to conduct a stable phosphorus removal by this combined method. (2) The corrosion rate of iron contactors is affected by the volumetric loading of BOD in the tanks where they are submerged. (3) Assuming that an iron contactor continues to suffer corrosion evenly all over the surface when our combined method is applied, it is estimated that the corrosion rate is about 1mm or less in 30 years.

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Biochar from slow pyrolysis of biological sludge from wastewater treatment: characteristics and effect as soil amendment

Biofuels Bioproducts and Biorefining ◽

10.1002/bbb.2220 ◽

2021 ◽

Author(s):

Ana C M Vilas‐Boas ◽

Luís A C Tarelho ◽

Mohammadreza Kamali ◽

Tailane Hauschild ◽

Daniel T Pio ◽

...

Keyword(s):

Wastewater Treatment ◽

Soil Amendment ◽

Slow Pyrolysis ◽

Biological Sludge ◽

Treatment Characteristics

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Sugarcane Bagasse as a Co-Substrate with Oil-Refinery Biological Sludge for Biogas Production Using Batch Mesophilic Anaerobic Co-Digestion Technology: Effect of Carbon/Nitrogen Ratio

Water ◽

10.3390/w13050590 ◽

2021 ◽

Vol 13 (5) ◽

pp. 590

Author(s):

Aiban Abdulhakim Saeed Ghaleb ◽

Shamsul Rahman Mohamed Kutty ◽

Gasim Hayder Ahmed Salih ◽

Ahmad Hussaini Jagaba ◽

Azmatullah Noor ◽

...

Keyword(s):

Anaerobic Digestion ◽

Sugarcane Bagasse ◽

Organic Waste ◽

Wastewater Treatment Plants ◽

Biogas Production ◽

Raw Materials ◽

Oil Refinery ◽

Methane Yield ◽

Oil Refineries ◽

Biological Sludge

Man-made organic waste leads to the rapid proliferation of pollution around the globe. Effective bio-waste management can help to reduce the adverse effects of organic waste while contributing to the circular economy at the same time. The toxic oily-biological sludge generated from oil refineries’ wastewater treatment plants is a potential source for biogas energy recovery via anaerobic digestion. However, the oily-biological sludge’s carbon/nitrogen (C/N) ratio is lower than the ideal 20–30 ratio required by anaerobic digestion technology for biogas production. Sugarcane bagasse can be digested as a high C/N co-substrate while the oily-biological sludge acts as a substrate and inoculum to improve biogas production. In this study, the best C/N with co-substrate volatile solids (VS)/inoculum VS ratios for the co-digestion process of mixtures were determined empirically through batch experiments at temperatures of 35–37 °C, pH (6–8) and 60 rpm mixing. The raw materials were pre-treated mechanically and thermo-chemically to further enhance the digestibility. The best condition for the sugarcane bagasse delignification process was 1% (w/v) sodium hydroxide, 1:10 solid-liquid ratio, at 100 °C, and 150 rpm for 1 h. The results from a 33-day batch anaerobic digestion experiment indicate that the production of biogas and methane yield were concurrent with the increasing C/N and co-substrate VS/inoculum VS ratios. The total biogas yields from C/N 20.0 with co-substrate VS/inoculum VS 0.06 and C/N 30.0 with co-substrate VS/inoculum VS 0.18 ratios were 2777.0 and 9268.0 mL, respectively, including a methane yield of 980.0 and 3009.3 mL, respectively. The biogas and methane yield from C/N 30.0 were higher than the biogas and methane yields from C/N 20.0 by 70.04 and 67.44%, respectively. The highest biogas and methane yields corresponded with the highest C/N with co-substrate VS/inoculum VS ratios (30.0 and 0.18), being 200.6 mL/g VSremoved and 65.1 mL CH4/g VSremoved, respectively.

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Feasibility of Activated Carbon Production from Biological Sludge by Chemical Activation with ZnCl2 and H2SO4

Environmental Technology ◽

10.1080/09593331708616433 ◽

1996 ◽

Vol 17 (6) ◽

pp. 667-671 ◽

Cited By ~ 41

Author(s):

M. J. Martin ◽

M. D. Balaguer ◽

M. Rigola

Keyword(s):

Activated Carbon ◽

Chemical Activation ◽

Carbon Production ◽

Biological Sludge

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Potential of activated sludge disintegration

Water Science & Technology ◽

10.2166/wst.2006.423 ◽

2006 ◽

Vol 53 (12) ◽

pp. 207-216 ◽

Cited By ~ 16

Author(s):

M. Boehler ◽

H. Siegrist

Keyword(s):

Sewage Sludge ◽

Cost Evaluation ◽

Anoxic Zone ◽

Excess Sludge ◽

Solid Retention Time ◽

Biological Sludge ◽

Operating Stability ◽

Agricultural Use ◽

Sludge Ash ◽

Sludge Production

The disposal of sewage sludge and the agricultural use of stabilised sludge are decreasing due to more stringent regulations in Europe. An increasing fraction of sewage sludge must therefore be dewatered, dried, incinerated and the ashes disposed of in landfills. These processes are cost-intensive and also lead to the loss of valuable phosphate resources incorporated in the sludge ash. The implementation of processes that could reduce excess sludge production and recycle phosphate is therefore recommended. Disintegration of biological sludge by mechanical, thermal and physical methods could significantly reduce excess sludge production, improve the settling properties of the sludge and reduce bulking and scumming. The solubilised COD could also improve denitrification if the treated sludge is recycled to the anoxic zone. However, disintegration partly inhibits and kills nitrifiers and could therefore shorten their effective solid retention time, thus reducing the safety of the nitrification. This paper discusses the potential of disintegration on sludge reduction, the operating stability of nitrification, the improvement of denitrification and also presents an energy and cost evaluation.

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Valorisation of residues from municipal wastewater sieving through anaerobic (co-)digestion with biological sludge

Waste Management & Research ◽

10.1177/0734242x211028449 ◽

2021 ◽

pp. 0734242X2110284

Author(s):

Maria Rosaria Boni ◽

Alessandra Polettini ◽

Raffaella Pomi ◽

Andreina Rossi ◽

Alessandro Filippi ◽

...

Keyword(s):

Municipal Wastewater ◽

Wastewater Treatment Plants ◽

Value Added ◽

Progressive Increase ◽

Matter Content ◽

Green Economy ◽

Municipal Wastewater Treatment ◽

Biological Sludge ◽

Single Use ◽

Municipal Wastewater Treatment Plants

The Circular and Green Economy principles is inspiring new approaches to municipal wastewater treatment plants (MWWTPs) design and operation. Recently, an ever-growing interest is devoted to exploring the alternatives for switching the WWTPs from being able to ‘simply’ removing contaminants from water to biorefinery-like plants where energy and material can be recovered. In this perspective, both wastewater and residues from process can be valorised for recovering nutrients (N and P), producing value added products (i.e. biopolymers), energy vectors and biofuels (i.e. bio-H2, bio-CH4 and bioethanol). As an additional benefit, changing the approach for WWTPs design and operation will decrease the overall amount of landfilled residues. In this context, the present research is aimed at evaluating the CH4 production potential of MWW screening units’ residues. While such a stream is typically landfilled, the expected progressive increase of biodegradable matter content due to the ban on single-use plastic along with the boost of bioplastics makes the investigation of different biochemical valorisation routes more and more interesting from an environmental and economical perspective. Thus, a full-scale data collection campaign was performed to gain information on screening residues amount and properties and to analyse the relationship with influent flowrate. The most relevant residue properties were measured, and lab-scale tests were carried out to evaluate the bio-CH4 potential.

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