scholarly journals Feasibility and potential of separate anaerobic digestion of municipal sewage sludge fractions

Water SA ◽  
2020 ◽  
Vol 46 (1 January) ◽  
Author(s):  
Dilek Erdirencelebi ◽  
Cansu Bayhan
Keyword(s):  
Methane Production ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Substantial Reduction ◽  
Methane Yield ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment ◽  
Oil And Grease ◽  
Daily Production

Feasibility of the separate anaerobic stabilization of primary (PS) and secondary (SS) sludge fractions produced in municipal wastewater treatment plants (WWTP) was studied at volatile loading rates (VLR) of 0.57–2.05 and 0.27–0.57 kg VS/(m3∙d) for PS and SS, respectively, corresponding to 16–30 and 14–28 d of hydraulic retention time (HRT). Laboratory-scale semi-continuous anaerobic reactors were operated at 35°C.  The operational performance and quality of the final stabilized sludge were monitored. PS and SS showed opposite thickening abilities exhibiting a need for direct feeding of PS to the digesters. Biodegradability was obtained as 52(±1) and 40(±5)% volatile solid (VS) removal for PS and SS, respectively. Optimum VLR was determined according to the highest methane yield (specific methane production), VS reduction and dewaterability of the stabilised sludge. An inhibitory effect was observed at higher VLRs in PS digestion inducing a gradual reduction in the methane yield and daily production. High oil and grease content was subject to a substantial reduction in PS digestion showing a dependency on HRT. Conversely, a considerable degree of augmentation took place in the stabilised SS with no correlation to HRT at values lower than 30 d. Efficient reduction in the oil and grease content improved dewaterability in stabilised PS whereas high oil and grease content prevented an improvement for stabilised SS. Major benefits were obtained as lower HRT and high stability with higher methane production and fertilizing (N and P content) characteristics for digestion performance and stabilized SS, whereas direct feeding and higher HRT for PS digestion were determined as beneficial.  

scholarly journals Feasibility and potential of separate anaerobic digestion of municipal sewage sludge fractions

Water SA ◽  
2020 ◽  
Vol 46 (1 January) ◽  
Author(s):  
Dilek Erdirencelebi ◽  
Cansu Bayhan
Keyword(s):  
Methane Production ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Substantial Reduction ◽  
Methane Yield ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment ◽  
Oil And Grease ◽  
Daily Production

Feasibility of the separate anaerobic stabilization of primary (PS) and secondary (SS) sludge fractions produced in municipal wastewater treatment plants (WWTP) was studied at volatile loading rates (VLR) of 0.57–2.05 and 0.27–0.57 kg VS/(m3∙d) for PS and SS, respectively, corresponding to 16–30 and 14–28 d of hydraulic retention time (HRT). Laboratory-scale semi-continuous anaerobic reactors were operated at 35°C.  The operational performance and quality of the final stabilized sludge were monitored. PS and SS showed opposite thickening abilities exhibiting a need for direct feeding of PS to the digesters. Biodegradability was obtained as 52(±1) and 40(±5)% volatile solid (VS) removal for PS and SS, respectively. Optimum VLR was determined according to the highest methane yield (specific methane production), VS reduction and dewaterability of the stabilised sludge. An inhibitory effect was observed at higher VLRs in PS digestion inducing a gradual reduction in the methane yield and daily production. High oil and grease content was subject to a substantial reduction in PS digestion showing a dependency on HRT. Conversely, a considerable degree of augmentation took place in the stabilised SS with no correlation to HRT at values lower than 30 d. Efficient reduction in the oil and grease content improved dewaterability in stabilised PS whereas high oil and grease content prevented an improvement for stabilised SS. Major benefits were obtained as lower HRT and high stability with higher methane production and fertilizing (N and P content) characteristics for digestion performance and stabilized SS, whereas direct feeding and higher HRT for PS digestion were determined as beneficial.  

scholarly journals Co-Combustion of Municipal Sewage Sludge and Hard Coal on Fluidized Bed Boiler WF-6

2014 ◽  
Vol 40 (3) ◽  
pp. 101-113 ◽  
Author(s):  
Rafał Rajczyk ◽  
Jurand Bień ◽  
Henryk Palka ◽  
Andrzej Pogodziński ◽  
Hubert Smorąg
Keyword(s):  
Sewage Sludge ◽  
Fluidized Bed ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Management Plan ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Hard Coal ◽  
Municipal Wastewater Treatment ◽  
Thermal Methods

Abstract According to data of the Central Statistical Office, the amount of sludge produced in municipal wastewater treatment plants in 2010 amounted to 526000 Mg d.m. The forecast of municipal sewage sludge amount in 2015 according to KPGO2014 will reach 642400 Mg d.m. and is expected to increase in subsequent years. Significant amounts of sludge will create problems due to its utilization. In order to solve this problem the use of thermal methods for sludge utilization is expected. According to the National Waste Management Plan nearly 30% of sewage sludge mass should be thermally utilized by 2022. The article presents the results of co-combustion of coal and municipal sewage sludge in a bubbling fluidized bed boiler made by SEFAKO and located in the Municipal Heating Company in Morag. Four tests of hard coal and sewage sludge co-combustion have been conducted. Boiler performance, emissions and ash quality were investigated.

scholarly journals The role of wastewater treatment plants in surface water contamination by plastic pollutants

2018 ◽  
Vol 45 ◽  
pp. 00054 ◽  
Author(s):  
Bozena Mrowiec
Keyword(s):  
Wastewater Treatment ◽  
Surface Water ◽  
Water Contamination ◽  
Membrane Filtration ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Point Sources ◽  
Municipal Sewage ◽  
Municipal Wastewater Treatment ◽  
Surface Water Contamination

The aim of this paper was to review the literature data regarding the physico-chemical characteristic of plastic pollutants discharged with municipal sewage, the practical possibility of removing microplastic particles from wastewater during different treatment steps in WWTPs and the problem of surface water contamination within them. Microplastics (the size range of 1 nm to < 5 mm), have been recognized as an emerging threat, as well as an ecotoxicological and ecological risk for water ecosystems. Municipal wastewater treatment plants (WWTPs) are mentioned as the main point sources of microplastics in an aquatic environment. Microplastic particles can be effectively removed in the primary treatment zones via solids skimming and sludge settling processes. Different tertiary treatment processes such as: gravity sand filtration, discfilter, air flotation and membrane filtration provide substantial additional removal of microplastics, and the efficiency of wastewater treatment process can be at a removal level of 99.9%. Nevertheless, given the large volumes of effluent constantly discharged to receivers, even tertiary level WWTPs may constitute a considerable source of microplastics in the surface water.

scholarly journals The bottlenecks and causes, and potential solutions for municipal sewage treatment in China

2020 ◽  
Vol 15 (1) ◽  
pp. 160-169 ◽  
Author(s):  
Yeshi Cao ◽  
M. C. M. Van Loosdrecht ◽  
Glen. T. Daigger
Keyword(s):  
Wastewater Treatment ◽  
Nutrient Removal ◽  
Urban Areas ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Sewage Treatment ◽  
Integrated Design ◽  
Cost Effective ◽  
Municipal Sewage ◽  
Municipal Wastewater Treatment

Abstract Since about the 1990s China has achieved remarkable progress in urban sanitation. The country has built very extensive infrastructure for wastewater treatment, with 94.5% treatment coverage in urban areas and legally mandated nation-wide full nutrient removal implemented. However, municipal wastewater treatment plants (WWTPs) in China are still confronted with issues rooted in the unique sewage characteristics. This study compares energy recovery, cost of nutrient removal and sludge production between Chinese municipal WWTPs and those in countries with longer wastewater treatment traditions, and highlights the cause-effect relationships between Chinese sewage characteristics – high inorganic suspended solids (ISS) loads, and low COD and C/N ratio, and municipal WWTP process performance in China. Integrated design and operation guidelines for municipal WWTPs are imperative in relation to the unique sewage characteristics in China. Cost-effective measures and solutions are proposed in the paper, and the potential benefits of improving the sustainability of municipal WWTPs in China are estimated.

scholarly journals The determination of fertiliser quality of the formed struvite from a WWTP

2021 ◽  
Author(s):  
C. González ◽  
B. Fernández ◽  
F. Molina ◽  
M. A. Camargo-Valero ◽  
C. Peláez
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Crop Yields ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment ◽  
Sand Column ◽  
Global Food Security ◽  
Dewatered Sewage Sludge

Abstract Struvite from nutrient-rich wastewaters has been identified as a potential substitute for commercial mineral fertilisers, with the added benefit of reducing threats to global food security by prolonging phosphate rock reserves. A fertilisation test using grass (Brachiaria brizantha Marandú) and a sand column leaching test was conducted to determine the agronomic effectiveness of struvite precipitates produced from the supernatant of dewatered sewage sludge (centrate) from a municipal Wastewater Treatment Plant (WWTP). The performance of this struvite as a fertiliser was compared with Biosolids and commercial fertilisers (Urea and Triple15). The results show that the concentration of heavy metals in struvite was lower than in Biosolids and below the limits of Colombia and European fertiliser regulations. Struvite increased the uptake of N and P in grass, resulting in crop yields similar to other treatments tested. Struvite use as an effective slow-release fertiliser is highly dependent on the size of crystal particles, particularly in achieving low P losses but resulted in high N loss in the sand columns tested; N loses from struvite were higher than in the commercial fertilisers due to the struvite small particle size. Therefore, struvite represents a suitable opportunity to recover and recycle nutrients from municipal sewage sludge, facilitating the effective reuse of P and N in agriculture and uptake by plants.

Safe Utilization of Municipal Sewage Sludge in Agriculture and Forestry

2015 ◽  
Vol 768 ◽  
pp. 542-552
Author(s):  
Liang Hei ◽  
Hui Wang ◽  
Qi Tang Wu ◽  
Wei Peng Yu
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Organic Fertilizer ◽  
Total Yield ◽  
Dry Weight ◽  
Scientific Basis ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment

Municipal sewage sludge has been increasingly produced in China with the development of municipal wastewater treatment. The use of sewage sludge as a fertilizer and soil amendment has resulted in high concentrations of heavy metals in the soil and food limiting its use. Controlling the pollution of heavy metals is the key factor to realize the safe utilization of sewage sludge. The present study was carried out to find scientific basis to the appropriate sludge applications in agriculture and forestry. Pilot experiments inEucalyptusforest showed that the total yield and nutrient amount ofP.hydridumwere significantly higher thanA.marorrhiza, the annual average yield in dry weight and total nutrient amount ofP.hydridumwere 21.32 thm-2and 1248.2 kghm-2, respectively, 9.18 times and 3.58 times that ofA.marorrhiza, soP.hydridumwere more suitable to be the converting plant from sludge to biochar or organic fertilizer. After plants treatment, the maturity of sludge increased significantly, water content and soluble heavy metals decreased obviously, so that the agricultural safety increased, and the all indicators were conformed to the sludge requirements for agricultural use. In addition, theEucalyptustrees grow well with a large spread of sewage sludge. Nutrient contents ofEucalyptusforestland soil increased and heavy metal contents of the topsoil beneath the sludge did not significantly increase.

Efficiency of SBR technology in municipal wastewater treatment plants

2002 ◽  
Vol 46 (4-5) ◽  
pp. 293-299 ◽  
Author(s):  
H. Steinmetz ◽  
J. Wiese ◽  
T.G. Schmitt
Keyword(s):  
Wastewater Treatment ◽  
Energy Demand ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Batch Reactor ◽  
Good Alternative ◽  
Municipal Sewage ◽  
Municipal Wastewater Treatment ◽  
Nitrogen And Phosphorus ◽  
Municipal Wastewater Treatment Plants

Four wastewater treatment plants running with sequencing batch reactor (SBR) technology have been evaluated in view of their effluent quality, treatment efficiency and energy demand. The plants are designed for approximately 5,000, 8,000, 15,000 and 25,000 population equivalents (p.e.). Although two of the plants were overloaded during the investigation time the effluent concentrations of nitrogen, especially ammonia, and phosphorus were low. The results show, that SBR plants which are designed according to German standards have additional capacities for degradation of organic matter and removal of nitrogen and phosphorus. Furthermore SBR plants with combined sewer systems are able to treat combined sewage very well. Thus SBR technology proves to be a good alternative for municipal sewage plants and can help to save investment costs.

scholarly journals Biogas Production from Food Residues—The Role of Trace Metals and Co-Digestion with Primary Sludge

Environments ◽  
2020 ◽  
Vol 7 (6) ◽  
pp. 42 ◽  
Author(s):  
Moshe Habagil ◽  
Alexander Keucken ◽  
Ilona Sárvári Horváth
Keyword(s):  
Methane Production ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Biogas Production ◽  
Process Efficiency ◽  
Municipal Wastewater Treatment ◽  
Primary Sludge ◽  
Mixing Ratios ◽  
Feasible Option ◽  
Food Residues

The majority of municipal Wastewater Treatment Plants (WWTPs) in Sweden produce biogas from sewage sludge. In order to increase the methane production, co-digestion of internal sludge with Organic Fraction of Municipal Solid Waste (OFMSW) might be feasible in the future. The objective of this study was therefore to find a beneficial solution for the utilization of OFMSW at the WWTP in Varberg, Sweden. The effects of co-digesting primary sludge (PS) and OFMSW collected in the municipality, in different mixing ratios, were investigated by semi-continuous anaerobic digestion assays. Furthermore, the effects of the addition of a commercial trace elements mixture solution (CTES), available on the market in Sweden, were also examined. Co-digestion of OFMSW and PS resulted in specific methane yields of 404, 392, and 375 NmL CH4/g volatile solids (VS), obtained during semi-continuous operations of 301, 357 and 385 days, for the reactors fed with OMFSW:PS ratio of 4:1, 3:1, and 1:1, and at maximum organic loading rates (OLRs) achieved of 4.0, 4.0 and 5.0 gVS/L/d, respectively. Furthermore, mono-digestion of OFMSW failed already at OLR of 1.0 gVS/L/d, however, an OLR of 4.0 gVS/L/d could be achieved with addition of 14 µL/g VS Commercial Trace Element Solutions (CTES) leading to 363 mL CH4/g VS methane production. These experiments were running during 411 days. Hence, higher process efficiency was obtained when using co-digestion of OFMSW and PS compared to that of OFMSW in mono-digestion. Co-digestion is a more feasible option where a balanced Carbon/Nitrogen (C/N) ratio and nutrient supply can be maintained.

Study on Rapid High-Efficient Composting Process of Sewage Sludge

2014 ◽  
Vol 955-959 ◽  
pp. 2940-2943
Author(s):  
Ke Zhao ◽  
Yu Zhang ◽  
Yu Ting Zhang ◽  
Ying Ying Yin
Keyword(s):  
Organic Matter ◽  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Phosphorus Concentration ◽  
Municipal Wastewater Treatment ◽  
Composting Process ◽  
High Efficient

Based on the static composting process of municipal sewage sludge, the parameters of the treatment process were studied, including moisture, temperature, pH, organic matter, total phosphorus, the number of bacterial and GI(Germination Index). The decomposition of organic matter and phosphorus concentration were obvious and the amount of bacteria varied regularly. After the composting, pH, water contend, organic matter and GI all met Disposal of sludge from municipal wastewater treatment plant-Control standard for agricultural use.

scholarly journals Reclamation of phosphogypsum deposition site in Wislinka near Gdansk with municipal sewage sludge

2019 ◽  
pp. 115-124
Author(s):  
Piotr Kowalik ◽  
Ewa Wojciechowska
Keyword(s):  
Sewage Sludge ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Land Application ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Municipal Wastewater Treatment ◽  
High Concentration ◽  
Enteric Parasites ◽  
Post Industrial

Utilization of sewage sludge is becoming one of the biggest environmental problems.One of the possible solutions is application of sludge to soil amendment. Sludge is a goodnatural fertilizer due to high concentration of organic carbon and nutrient elements (N, P).On the contrary, sewage sludge also contains heavy metals and may be contaminatedwith enteric parasites. Thus application of sludge to land could result in contamination ofsurface and ground waters and including trace metals in the food chains due tocontamination of plants grown on sludge amended soils. Hence land application of sludgeought to be carefully monitored and follow stringent regulations, which are often difficultto fulfil. However, if sludge is applied to reclamation of degraded post-industrial lands,waste deposition sites, landfills and formation of soil-like surface layer on soil-lessgrounds, the restrictions are not so stringent and easier to fulfil than in cases when cropsare grown on sludge amended soils.In the article reclamation of a phosphogypsum deposition site in Wislinka near Gdanskusing sewage sludge from a municipal wastewater treatment plant (WWTP) is discussed.Phosphogypsum deposit in Wislinka for many years has been one of the biggestenvironmental problems of the region, causing permanent complainants from localcommunities. Reclamation of the deposition site started in 1999 and has been continuedup till now. Covering of the slopes with a layer of sludge reduces dangerous wind erosionof dust and promotes plants succession.

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