scholarly journals Influence of Wastewater Treatment and The Method of Sludge Disposal on the Gasification Process

2014 ◽  
Vol 21 (2) ◽  
pp. 255-268 ◽  
Author(s):  
Sebastian Werle ◽  
Mariusz Dudziak
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Fixed Bed ◽  
Treatment Plant ◽  
Experimental Investigations ◽  
Heating Value ◽  
Treatment Processes ◽  
Sludge Disposal

Abstract Municipal wastewater treatment results in the production of large quantities of sewage sludge, which requires proper environmentally accepted management before final disposal. Sewage sludge is a by-product of current wastewater treatment technologies. Sewage sludge disposal depends on the sludge treatment methods used in the wastewater treatment plant (anaerobic or aerobic digestion, drying, etc.). Taking into consideration presented given this information, a study concerning the effects of wastewater treatment processes and sewage sludge drying method on the sewage sludge gasification gas parameters was performed. Gasification is a prospective alternative method of sludge thermal treatment. For the purpose of experimental investigations, a laboratory fixed bed gasifier installation was designed and built. Two types of sewage sludge feedstock, SS1 and SS2, were analyzed. Sewage sludge SS1 came from a wastewater treatment plant operating in the mechanical and biological system while sewage sludge SS2 was collected in a mechanical, biological and chemical wastewater treatment plant with simultaneous phosphorus precipitation. The sludge produced at the plants was subject to fermentation and then, after being dehydrated, dried in a cylindrical drier on shelves heated up to 260ºC (sewage sludge SS1) and using hot air at a temperature of 150ºC in a belt drier (sewage SS2). The analysis shows that the sewage sludge properties strongly depend on the wastewater sources and the wastewater treatment processes. The gasification results, presented as a function of the amount of gasification agent, show that the greater oxygen content of SS1 caused a reduction in the reaction temperature. Paradoxically, this effect caused an increase in the quantity of combustible components in the gas. As expected, increasing the air flow rate caused a decrease in the heating value of the gas produced. A higher amount of oxidizer increases the amounts of noncombustible species and the volumetric fraction of nitrogen, thus reducing the heating value of the obtained gas. The higher hydrogen content in SS1 affects the gasification gas composition. As a result, combustible components are the majority of the syngas.

Potentials and limits of anaerobic digestion of sewage sludge: Energy self-sufficient municipal wastewater treatment plant?

2012 ◽  
Vol 66 (6) ◽  
pp. 1277-1281 ◽  
Author(s):  
P. Jenicek ◽  
J. Bartacek ◽  
J. Kutil ◽  
J. Zabranska ◽  
M. Dohanyos
Keyword(s):  
Wastewater Treatment ◽  
Energy Consumption ◽  
Anaerobic Digestion ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Biogas Production ◽  
Treatment Plant ◽  
Self Sufficiency ◽  
Digestion Efficiency

Anaerobic digestion is the only energy-positive technology widely used in wastewater treatment. Full-scale data prove that the anaerobic digestion of sewage sludge can produce biogas that covers a substantial amount of the energy consumption of a wastewater treatment plant (WWTP). In this paper, we discuss possibilities for improving the digestion efficiency and biogas production from sewage sludge. Typical specific energy consumptions of municipal WWTPs per population equivalent are compared with the potential specific production of biogas to find the required/optimal digestion efficiency. Examples of technological measures to achieve such efficiency are presented. Our findings show that even a municipal WWTP with secondary biological treatment located in a moderate climate can come close to energy self-sufficiency. However, they also show that such self-sufficiency is dependent on: (i) the strict optimization of the total energy consumption of the plant, and (ii) an increase in the specific biogas production from sewage sludge to values around 600 L per kg of supplied volatile solids.

Studies on the cytotoxicity of filtrates obtained from sewage sludge from the municipal wastewater treatment plant

2020 ◽  
Vol 186 ◽  
pp. 29-38
Author(s):  
Agata Jabłońska-Trypuć ◽  
Urszula Wydro ◽  
Lluis Serra-Majem ◽  
Andrzej Butarewicz ◽  
Elżbieta Wołejko
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Municipal Wastewater Treatment Plant

scholarly journals Chemical amelioration of nepheline sands using sewage sludge from a regional wastewater treatment plant

Vestnik MGTU ◽  
2021 ◽  
Vol 24 (1) ◽  
pp. 88-96
Author(s):  
T. T. Gorbacheva ◽  
A. V. Lusis ◽  
L. A. Ivanova
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Single Species ◽  
Phleum Pratense ◽  
Wastewater Sludge ◽  
Environmental Damage ◽  
Tailing Dump

The studies on the use of municipal wastewater sludge as an unconventional chemical ameliorant with a fertilizing effect were carried out on ore dressing waste ("tailings") of the apatite-nepheline plant ANOF-2 KF JSC "Apatit" with a predominance of nepheline sands in their composition. The tailings dump is included in the list of objects of accumulated environmental damage in the region, but due to its rich mineral composition, it is recognized as a technogenic deposit subject to conservation for the prospect of obtaining apatite, nepheline, sphene, aegirine and titanomagnetite concentrates. In the work, the method of phytotesting of soil irrigated with unfiltered rainwater with fragmentary application of sewage sludge of a regional wastewater treatment plant enterprise has been applied. The experiments have been carried out on a single-species seed recommended for reclamation of disturbed territories in the northern regions. During the formation of a sown phytocenosis from meadow timothy ( Phleum pratense L.) on nepheline sands, the stimulating effect of sewage sludge on the nutrient regime of the soil is confirmed. After phytoextraction (at the end of the experiment), it retains a high residual pool of basic nutrients (N, P, K), which indicates a prolonged action of sewage sludge. To confirm the effect obtained in laboratory conditions, a field experiment has been laid at the ANOF-2 reserve tailing dump in 2019, observations are continuing.

scholarly journals ANALYSIS OF THE MOBILITY OF HEAVY METALS IN SLUDGE FOR THE SEWAGE TREATMENT PLANT IN DALESZYCE

2020 ◽  
Vol 12 (2) ◽  
pp. 85-92
Author(s):  
ROBERT KOWALIK ◽  
JAROSŁĄW GAWDZIK ◽  
BARBARA GAWDZIK ◽  
ALICJA GAWDZIK
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Metal Content ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Total Metal Content ◽  
Treatment Processes

Sewage sludge is a by-product of wastewater treatment processes. However, it has high fertilising and soil-forming properties, but it cannot always be used for this purpose. The two main criteria limiting their natural use are heavy metals and parasite eggs. Sewage sludge taken from the Daleszyce wastewater treatment plant has been analysed for heavy metals. For this purpose a space analysis was performed to divide the total metal content into four mobility fractions. The mobility issue determines the ability of an element, or one of its forms, to move in the environment. The studies were performed using a four-stage BCR procedure. The results were analyzed and compared to the limits applicable in Poland for sewage sludge intended for environmental use.

scholarly journals Sewage sludge from Taxco de Alarcón wastewater treatment plant as substrate to cultivate Panicum maximum

2021 ◽  
Vol 38 (3) ◽  
pp. 164-177
Author(s):  
Erik Yoel Carreto-Morales ◽  
Jazmin Alaide López-Díaz ◽  
Mariana Martínez-Castrejón ◽  
Oscar Talavera-Mendoza ◽  
Roberto Carlos Almazán-Núñez ◽  
...  
Keyword(s):  
Organic Matter ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Organic Matter Content ◽  
Treatment Plant ◽  
Added Value ◽  
Panicum Maximum ◽  
Southern Mexico

The management and disposal of the sewage sludge (SS) generated by a wastewater treatment plant (WWTP) as part of the municipal wastewater (MWW) treatment process is one of the main socio-environmental issues faced by this type of system. Taxco de Alarcón, Guerrero, in southern Mexico has had a WWTP operating since 2016, and the SS disposal is a task that must be addressed by the WWTP. Thus, the aim of this work was to evaluate the growth capacity of Panicum maximum, also known as mombaza grass (MG), by using SS generated within the "Taxco de Alarcón wastewater treatment plant" as substrate. To do so, 4 g of MG seeds were scattered over 5 kg (dry basis) of SS. As a control, a commercial compost soil was used, hereafter called pattern soil (PS). The experiment was carried out in triplicates for three months and drinking water (water used for human consumption) was used for crop irrigation. Each month a MG harvest was carried out. The response variables analyzed for MG were germination time (one month after plant emergence), height (HMG), growth rate GrMG, and yield (YMG), whereas in the SS and PS the content of organic matter was analyzed. Furthermore, the chemical composition was analyzed using scanning electron microscopy and X-ray energy dispersion spectroscopy (SEM-EDS) on the MG, SS, and PS. The results showed that MG germinated faster on PS (5 days) than germination on SS (7 days). However, the MG grown on SS reached a considerably higher height (45 cm) compared to the height reached on PS (17 cm). Furthermore, the maximum GrMG over SS was also higher than the maximum GrMG observed on the PS, 3.64 and 1.40 cm∙day-1, respectively. In terms of YMG, it was observed that on SS it reached an average monthly YMG of 416 g∙m-2, whereas in PS it reached a YMG of 72 g∙m-2. The chemical analysis detected P, K, Ca, Mg, and S, considered macronutrients in both substrates. Besides, some micronutrients identified in SS were Cu, Fe, Mn, and Zn, whereas in PS it was also possible to detect micronutrients except Mn and Zn. All the macronutrients detected in the substrates were observed in the harvested MG. However, in the MG harvested in PS, Mn and Zn were not detected. Hence, a feasible disposal strategy for the SS generated by the Taxco de Alarcón WWTP is as a substrate for grass forage MG by its high organic matter content, the significant presence of macro and micronutrients, and the performance shown by MG cultivated in SS. Furthermore, the SS characteristics provide added value and can be considered as organic amendments of agricultural soils.

scholarly journals Conversion of Sewage Sludge and Other Biodegradable Waste into High-Value Soil Amendment within a Circular Bioeconomy Perspective

Energies ◽  
2021 ◽  
Vol 14 (21) ◽  
pp. 6953
Author(s):  
Ewa Neczaj ◽  
Anna Grosser ◽  
Anna Grobelak ◽  
Piotr Celary ◽  
Bal Ram Singh
Keyword(s):  
Heavy Metals ◽  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Municipal Wastewater ◽  
Treatment Plant ◽  
Organic Fertilizers ◽  
Municipal Wastewater Treatment ◽  
Biodegradable Waste ◽  
Digestion Process

Resource recovery from biodegradable waste is essential in order to reach the goals of zero circular economy waste generation and zero greenhouse gas emissions from the waste sector. Waste whose management is a real challenge is sewage sludge, mainly because of high concentrations of heavy metals. The aim of this study was to compare the effectiveness of material stabilization during aerobic stabilization of two feedstocks with sewage sludge obtained from different sources, namely, digestate from a municipal wastewater treatment plant and digestate from a co-digestion process. Moreover, the goal of the experiment was to assess the quality of compost in terms of remediation potential. The composting process was carried out for four different mixtures consisting of the mentioned digestates, municipal solid waste, and grass. A better composting efficiency with digestate from the co-digestion process was observed. In that case, a higher temperature in the thermophilic phase (>55 °C) and a higher organic matter loss ratio (60%) were obtained as compared to the process with digestate from wastewater treatment plant. Taking into account the fertilizing properties and the concentration of heavy metals, all obtained composts met the requirements set out in the Polish Regulation for organic fertilizers. Only the content of Helminth eggs in the composts produced with the digestate from the wastewater treatment plant was above the acceptable level. The research also proved that the produced composts can be used in the phytoremediation process of the degraded area. It was found that all composts caused a significant increase in fescue biomass. The highest yield was achieved for compost produced from a mixture with the addition of 30% sewage sludge from the co-digestion process.

scholarly journals Preliminary Examination on isolation of Microplastics (MPs) in Sewage Sludge from the Local Wastewater Treatment Plant

2019 ◽  
Vol 9 (1) ◽  
pp. 7514-7516
Keyword(s):  
Wastewater Treatment ◽  
Sewage Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Average Concentration ◽  
Asian Countries ◽  
Sludge Disposal ◽  
Preliminary Examination ◽  
Preliminary Study ◽  
Southeast Asian Countries

The outfalls from wastewater treatment plant has become a major receptor for the release of large quantity of microplastics (MPs) in the environment. To investigate such premise, the present work investigates the preliminary study on detecting and isolating the microplastics present in the sewage sludges, which extensively used as a fertilizer. Especially, the sludge-based MPs are greatly found in India and Southeast Asian countries. The average concentration MPs found in the sludge was found to be 31x103 particles per kg of dry sludge. In order to evaluate the performance of the methods used, spike study was tested using Polystyrene, polyethylene terephthalate and polyethylene materials. These outcomes confirmed that sewage sludge disposal is one of the main sources of microplastic pollution in the ecosystem.

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