scholarly journals Methanogens Diversity during Anaerobic Sewage Sludge Stabilization and the Effect of Temperature

Processes ◽  
2020 ◽  
Vol 8 (7) ◽  
pp. 822 ◽  
Author(s):  
Tomáš Vítěz ◽  
David Novák ◽  
Jan Lochman ◽  
Monika Vítězová
Keyword(s):  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Significant Proportion ◽  
Methanogenic Archaea ◽  
Effect Of Temperature ◽  
Anaerobic Sludge ◽  
Sludge Stabilization ◽  
Decomposition Of Organic Matter ◽  
Different Temperatures ◽  
Methanothermobacter Marburgensis

Anaerobic sludge stabilization is a commonly used technology. Most fermenters are operated at a mesophilic temperature regime. Modern trends in waste management aim to minimize waste generation. One of the strategies can be achieved by anaerobically stabilizing the sludge by raising the temperature. Higher temperatures will allow faster decomposition of organic matter, shortening the retention time, and increasing biogas production. This work is focused on the description of changes in the community of methanogenic microorganisms at different temperatures during the sludge stabilization. At higher temperatures, biogas contained a higher percentage of methane, however, there was an undesirable accumulation of ammonia in the fermenter. Representatives of the hydrogenotrophic genus Methanoliea were described at all temperatures tested. At temperatures up to 50 °C, a significant proportion of methanogens were also formed by acetoclastic representatives of Methanosaeta sp. and acetoclastic representatives of the order Methanosarcinales. The composition of methanogens in the fermenter significantly changed at 60 °C when typically thermophilic species, like Methanothermobacter marburgensis, appeared. A decrease in the diversity of methanogens was observed, and typical hydrogenotrophic methanogenic archaea isolated from fermenters of biogas plants and anaerobic wastewater treatment plants represented by genus Methanoculleus were no longer present.

Sludge digestion enhancement and nutrient removal from anaerobic supernatant by Mg(OH)2 application

2001 ◽  
Vol 44 (1) ◽  
pp. 161-166 ◽  
Author(s):  
Q. Wu ◽  
P. L. Bishop ◽  
T. C. Keener ◽  
J. Stallard ◽  
L. Stile
Keyword(s):  
Biogas Production ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Ammonia Nitrogen ◽  
Phosphate Removal ◽  
Anaerobic Sludge ◽  
Phosphorus Concentration ◽  
Sludge Stabilization ◽  
Sludge Digestion ◽  
Anaerobic Sludge Digestion

Anaerobic sludge digestion is a widely adopted process for sludge stabilization. Phosphate removal from anaerobic supernatant is necessary to limit the phosphate returned to the head of the treatment plant, thereby improving the overall treatment efficiency. In this study, magnesium hydroxide (Mg(OH)2) was used to improve the sludge digestion efficiency and to remove phosphorus from anaerobic supernatant. The anaerobic sludge digestion experiment was conducted at a pilot scale, and the results showed that applying Mg(OH)2 to anaerobic sludge digester resulted in a larger reduction in SS and COD, a higher biogas production rate, a lower level of phosphate and ammonia nitrogen concentrations in the sludge supernatant and an improved sludge dewaterability. Research results at both lab scale and pilot scale on phosphorus removal from anaerobic supernatant using Mg(OH)2 showed that a high removal of phosphorus can be achieved through the addition of Mg(OH)2. The required reaction time depends on the initial phosphorus concentration and the Mg(OH)2 dosage.

scholarly journals Environmental-Economic Analysis of Integrated Organic Waste and Wastewater Management Systems: A Case Study from Aarhus City (Denmark)

2018 ◽  
Vol 10 (10) ◽  
pp. 3742 ◽  
Author(s):  
Marianne Thomsen ◽  
Daina Romeo ◽  
Dario Caro ◽  
Michele Seghetta ◽  
Rong-Gang Cong
Keyword(s):  
Food Waste ◽  
Organic Waste ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Environmental Benefits ◽  
Anaerobic Sludge ◽  
Wastewater Management ◽  
Management Scenarios ◽  
Trade Offs ◽  
Biogas Plants

This study presents a comparative analysis of the environmental and economic performances of four integrated waste and wastewater management scenarios in the city of Aarhus in Denmark. The purpose of this analysis is to deliver decision support regarding whether (i) the installation of food waste disposers in private homes (AS1) or (ii) separate collection and transport of organic waste to biogas plants is a more viable environmental and economic solution (AS2). Higher environmental benefits, e.g., mitigation of human health impacts and climate change, are obtained by transforming the existing waste combustion system into scenario (ii). Trade-offs in terms of increased marine eutrophication and terrestrial ecotoxicity result from moving up the waste hierarchy; i.e., from waste incineration to biogas production at wastewater treatment plants with anaerobic sludge digestion. Scenario (i) performs with lower energy efficiency compared to scenario (ii). Furthermore, when considering the uncertainty in the extra damage cost to the sewer system that may be associated to the installation of food waste disposers, scenario (ii) is the most flexible, robust, and less risky economic solution. From an economic, environmental, and resource efficiency point of view, separate collection and transport of biowaste to biogas plants is the most sustainable solution.

scholarly journals Diverse Microbial Community Profiles of Propionate-Degrading Cultures Derived from Different Sludge Sources of Anaerobic Wastewater Treatment Plants

2020 ◽  
Vol 8 (2) ◽  
pp. 277 ◽  
Author(s):  
Pantakan Puengrang ◽  
Benjaphon Suraraksa ◽  
Peerada Prommeenate ◽  
Nimaradee Boonapatcharoen ◽  
Supapon Cheevadhanarak ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
16S Rrna Gene Sequencing ◽  
Anaerobic Sludge ◽  
Rrna Gene ◽  
Inside Information ◽  
Microbial Profile ◽  
Rrna Gene Sequencing ◽  
Enriched Cultures

Anaerobic digestion (AD) has been used for wastewater treatment and production of renewable energy or biogas. Propionate accumulation is one of the important problems leading to an unstable system and low methane production. Revealing propionate-degrading microbiome is necessary to gain a better knowledge for alleviation of the problem. Herein, we systematically investigated the propionate-degrading cultures enriched from various anaerobic sludge sources of agro-industrial wastewater treatment plants using 16S rRNA gene sequencing. Different microbial profiles were shown even though the methanogenic activities of all cultures were similar. Interestingly, non-classical propionate-degrading key players Smithella, Syntrophomonas, and Methanosaeta were observed as common prevalent taxa in our enriched cultures. Moreover, different hydrogenotrophic methanogens were found specifically to the different sludge sources. The enriched culture of high salinity sludge showed a distinct microbial profile compared to the others, containing mainly Thermovirga, Anaerolinaceae, Methanosaeta, Syntrophobactor, and Methanospirillum. Our microbiome analysis revealed different propionate-degrading community profiles via mainly the Smithella pathway and offers inside information for microbiome manipulation in AD systems to increase biogas production corresponding to their specific microbial communities.

scholarly journals Eco-Efficiency Assessment of Control Actions in Wastewater Treatment Plants

Water ◽  
2021 ◽  
Vol 13 (5) ◽  
pp. 612
Author(s):  
Silvana Revollar ◽  
Montse Meneses ◽  
Ramón Vilanova ◽  
Pastora Vega ◽  
Mario Francisco
Keyword(s):  
Decision Making ◽  
Wastewater Treatment ◽  
Control Strategy ◽  
Energy Use ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Seasonal Effects ◽  
Effect Of Temperature ◽  
Seasonal Effect ◽  
Control Actions

This work explores the possibilities of improving the eco-efficiency of Wastewater Treatment Plants (WWTPs) introducing a plant-wide perspective in the formulation of the control strategy. Eco-efficiency goals are contemplated in the analysis of the appropriateness of control actions, considering the seasonal effects of temperature into the decision-making process. Plant-wide control strategy handles are the operation variables of the activated sludge process, the volume of the primary clarifier, and the temperature of the anaerobic digester. Performance is evaluated in terms of energy use, biogas production, effluent quality, emissions to air and soil, considering annual and bimestrial average values of indicators to capture seasonal effect of temperature. The result is a set of possible solutions, obtained from a multi-objective decision-making procedure, consisting on a sequence of control actions applied at different temporal windows that improve the eco-efficiency indicators of the plant. The results obtained when applying the different solutions make evident how the application of plant-wide control strategies is useful to improve performance indicators that represent individual goals, leading to trade-off solutions that describe WWTPs’ eco-efficiency.

scholarly journals Inhibition of Methane Fermentation by Antibiotics Introduced to Municipal Anaerobic Sludge

Proceedings ◽  
2018 ◽  
Vol 2 (20) ◽  
pp. 1274 ◽  
Author(s):  
Paulina Rusanowska ◽  
Marcin Zieliński ◽  
Marcin Dębowski ◽  
Monika Harnisz ◽  
Ewa Korzeniewska ◽  
...  
Keyword(s):  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Degradation Products ◽  
Control Sample ◽  
Transformation Products ◽  
Anaerobic Sludge ◽  
Methane Fermentation ◽  
Treatment Processes ◽  
Unused Medications

Annually, a few thousand tons of antibiotics and their transformation products (metabolites and degradation products) are introduced to wastewater treatment plants (WWTPs) as a result of human and animal excretion, or dispose of expired or unused medications. Antibiotics present in wastes might inhibit their treatment processes for instance during methane fermentation. In this study, β-lactams, tetracycline’s, fluoroquinolones, sulphonamides and metronidazole were selected as inhibitors of methane fermentation of sewage sludge collected from municipal WWTP. The experiments were performed in two series with different concentrations of antibiotics. The biogas production did not significantly differ between series, and was from 151.7 ± 18.9 mL/g VS (in the bioreactor with metronidazole addition—II series) to 208.3 ± 11.9 mL/g VS (in the bioreactor with amoxicillin addition—I series). In the control sample biogas production was 203.7 ± 21.1 mL/g VS. The methane content in all experiments was from 61.3 ± 2.1% to 66.4 ± 3.1%. The results indicated that microorganisms in anaerobic sludge from municipal wastewater are highly resistant to antibiotics in the tested concentrations. Antibiotic present in wastewater probably caused of antibiotic resistance in bacteria.

Improvement of Anaerobic Sludge Digestion by Disintegration of Activated Sludge using Vacuum Process

2003 ◽  
Vol 38 (3) ◽  
pp. 515-526 ◽  
Author(s):  
Bassim E. Abbassi
Keyword(s):  
Wastewater Treatment Plants ◽  
Sodium Dodecyl ◽  
Anaerobic Sludge ◽  
Excess Sludge ◽  
Additional Increase ◽  
Sludge Stabilization ◽  
Sludge Digestion ◽  
Rate Limiting Step ◽  
Secondary Sludge ◽  
Hydrolysis Process

Abstract The amount of excess sludge production from wastewater treatment plants is continuously increasing. Therefore, minimization of excess sludge is becoming increasingly important. The aim of bacterial cell disintegration is the release of the cell contents as an aqueous extract. This accelerates the cell hydrolysis that is usually considered to be the rate-limiting step in the sludge stabilization. Vacuum disintegration can activate the biological hydrolysis process and therefore, significantly increase the stabilization rate of the secondary sludge. It has been shown that when subjecting the sludge to 30 min of vacuuming, the COD concentration in the supernatant increased from 120 mg/L to more than 300 mg/L. Sodium dodecyl sulfate surfactant and lime have been used in different concentrations to enhance the hydrolysis process. The results show an additional increase in the supernatant COD concentration. For disintegrated excess sludge, an improved and accelerated anaerobic digestion is detected. The digestion process is characterized by higher degradation with increased disintegration.

BIOGAS PRODUCTION IN THE CONCENTRATED DISTILLERY WASTEWATER TREATMENT

2018 ◽  
pp. 51-59 ◽  
Author(s):  
N. Golub ◽  
M. Potapova ◽  
M. Shinkarchuk ◽  
O. Kozlovets
Keyword(s):  
Wastewater Treatment ◽  
Dry Matter ◽  
Ph Value ◽  
Biogas Production ◽  
Anaerobic Sludge ◽  
Methane Formation ◽  
Maximum Output ◽  
Processing Technologies ◽  
Spent Wash ◽  
Distillery Spent Wash

The paper deals with the waste disposal problem of the alcohol industry caused by the widespread use of alcohol as biofuels. In the technology for the production of alcohol from cereal crops, a distillery spent wash (DSW) is formed (per 1 dm3 of alcohol – 10–20 dm3 DSW), which refers to highly concentrated wastewater, the COD value reaches 40 g O2/dm3. Since the existing physical and chemical methods of its processing are not cost-effective, the researchers develop the processing technologies for its utilization, for example, an anaerobic digestion. Apart from the purification of highly concentrated wastewater, the advantage of this method is the production of biogas and highquality fertilizer. The problems of biotechnology for biogas production from the distillery spent wash are its high acidity–pH 3.7–5.0 (the optimum pH value for the methanogenesis process is 6.8–7.4) and low nitrogen content, the lack of which inhibits the development of the association of microorganisms. In order to solve these problems, additional raw materials of various origins (chemical compounds, spent anaerobic sludge, waste from livestock farms, etc.) are used. The purpose of this work is to determine the appropriate ratio of the fermentable mixture components: cosubstrate, distillery spent wash and wastewater of the plant for co-fermentation to produce an energy carrier (biogas) and effective wastewater treatment of the distillery. In order to ensure the optimal pH for methanogenesis, poultry manure has been used as a co-substrate. The co-fermentation process of DSW with manure has been carried out at dry matter ratios of 1:1, 1:3, 1:5, 1:7 respectively. It is found that when the concentration of manure in the mixture is insufficient (DSW/manure – 1:1, 1:3), the pH value decreases during fermentation which negatively affects methane formation; when the concentration of manure in the mixture is increased (DSW/manure – 1:5, 1:7), the process is characterized by a high yield of biogas and methane content. The maximum output of biogas with a methane concentration of 70 ± 2% is observed at the ratio of components on a dry matter “wastewater: DSW: manure” – 0,2:1:7 respectively. The COD reduction reaches a 70% when using co-fermentation with the combination of components “wastewater: DSW: manure” (0,3:1:5) respectively.

Analysis and balance of phosphorous removal from wastewater at urban wastewater treatment plant

2020 ◽  
Vol 15 (2) ◽  
pp. 142-151
Author(s):  
Peter Lukac ◽  
Lubos Jurik
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Phosphorus Recovery ◽  
Anaerobic Sludge ◽  
Biological Phosphorus Removal ◽  
The Mean

Abstract:Phosphorus is a major substance that is needed especially for agricultural production or for the industry. At the same time it is an important component of wastewater. At present, the waste management priority is recycling and this requirement is also transferred to wastewater treatment plants. Substances in wastewater can be recovered and utilized. In Europe (in Germany and Austria already legally binding), access to phosphorus-containing sewage treatment is changing. This paper dealt with the issue of phosphorus on the sewage treatment plant in Nitra. There are several industrial areas in Nitra where record major producers in phosphorus production in sewage. The new wastewater treatment plant is built as a mechanicalbiological wastewater treatment plant with simultaneous nitrification and denitrification, sludge regeneration, an anaerobic zone for biological phosphorus removal at the beginning of the process and chemical phosphorus precipitation. The sludge management is anaerobic sludge stabilization with heating and mechanical dewatering of stabilized sludge and gas management. The aim of the work was to document the phosphorus balance in all parts of the wastewater treatment plant - from the inflow of raw water to the outflow of purified water and the production of excess sludge. Balancing quantities in the wastewater treatment plant treatment processes provide information where efficient phosphorus recovery could be possible. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. The mean daily value of P tot is approximately 122.3 kg/day of these two sources. There are also two outflows - drainage of cleaned water to the recipient - the river Nitra - 9.9 kg Ptot/day and Ptot content in sewage sludge - about 120.3 kg Ptot/day - total 130.2 kg Ptot/day.

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