Grease waste and sewage sludge co-digestion enhancement by thermal hydrolysis: batch and fed-batch assays

2014 ◽  
Vol 69 (9) ◽  
pp. 1911-1918 ◽  
Author(s):  
R. Cano ◽  
A. Nielfa ◽  
A. Pérez ◽  
L. Bouchy ◽  
M. Fdz-Polanco
Keyword(s):  
Sewage Sludge ◽  
Methane Production ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Thermal Hydrolysis ◽  
Fed Batch ◽  
Digestion Process ◽  
Biological Sludge ◽  
Methane Potential

Grease waste (GW) is an adequate substrate for sewage sludge co-digestion since, coming from a waste water treatment plant, it has a high methane potential (489 NmLCH4/gVSin); however, no synergistic effect takes place when co-digesting with 52%VS grease. Conversely, thermal hydrolysis (TH) improves the anaerobic digestion of GW (43% higher kinetics) and biological sludge (29% more methane potential). Therefore, the application of TH to a co-digestion process was further studied. First, biochemical methane potential tests showed that the best configuration to implement the TH to the co-digestion process is pretreating the biological sludge alone, providing a 7.5% higher methane production (398 NmLCH4/gVSin), 20% faster kinetics and no lag-phase. Its implementation in a fed-batch operation resulted in considerable methane production (363 NmLCH4/gVSin) and TH improved the rheology and dewaterability properties of the digestate. This leads to important economical savings when combined with co-digestion, reducing final waste management costs and showing interesting potential for full-scale application.

Application of Thermally Treated Sewage Sludge in Blended Cements

2014 ◽  
Vol 905 ◽  
pp. 191-194 ◽  
Author(s):  
Zbyšek Pavlík ◽  
Milena Pavlíková ◽  
Jan Fořt ◽  
Martina Záleská ◽  
Igor Medveď ◽  
...  
Keyword(s):  
Sewage Sludge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Diffraction Method ◽  
High Strength ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Partial Replacement ◽  
Blended Cements ◽  
Thermally Treated

Chemical, physical, morphological, and mineralogical analysis of sewage sludge originating from a waste water treatment plant in Patras, Greece, is presented in the paper. The sewage sludge is firstly dried at 70°C, then oven-burned at 700°C for two hours and milled. The thermally treated material is analyzed using XRF and XRD, the particle size distribution is determined by a laser diffraction method. A potential use of sewage sludge in blended cements is investigated on the basis of the measurement of mechanical and basic physical properties of pastes containing the sludge in an amount of up to 60% of the mass of cement. Experimental results show that the thermal treatment of pre-dried sewage sludge and its grinding provides a material that can be successfully applied as a partial replacement of Portland cement. At a production of blended cements for high strength concrete, an up to 20% cement replacement level can be recommended.

Evaluation by Kinetic Models of Anaerobe Digestion Performances for Various Substrates and Co-substrates

2017 ◽  
Vol 68 (11) ◽  
pp. 2614-2617
Author(s):  
Adrian Eugen Cioabla ◽  
Gabriela Alina Dumitrel ◽  
Ioana Ionel
Keyword(s):  
Anaerobic Digestion ◽  
Kinetic Models ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Gompertz Model ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Complex Process ◽  
Methane Potential ◽  
Modified Gompertz Model

Anaerobic digestion is a complex process that allows the conversion of organic wastes into biogas with minimal costs and benefits for the environment. The goal of this study is to evaluate the anaerobic digestion potential of two common agricultural biomass wastes (degraded corn and degraded wheat) used as single substrates or as co-substrates together with wastewater from a waste water treatment plant. The results reveal that the co-digestion is an improved solution, both in terms of biogas amount produced and its methane concentration. Two kinetic models (modified Gompertz model and logistical growth model) were applied to study the methane production. For each case, the kinetic parameters were estimated. One demonstrates that the modified Gompertz model fitted very well the measured methane potential, for all studied cases.

Evaluating the Effect of Sewage Sludge on Bioactive Components of Momordicacharantia

2021 ◽  
Vol 43 (4) ◽  
pp. 386-386
Author(s):  
Zohaib Saeed Zohaib Saeed ◽  
Ikram Ahmad Ikram Ahmad ◽  
Shahid Iqbal Shahid Iqbal ◽  
Umer Younas Umer Younas ◽  
Muhammad Pervaiz Muhammad Pervaiz ◽  
...  
Keyword(s):  
Oleic Acid ◽  
Sewage Sludge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Bioactive Components ◽  
Medical Systems ◽  
Intestinal Gas ◽  
Treatment Of Diabetes

Momordicacharantia L. belongs to the family Cucurbitaceae. This plant has widely been reported for use in traditional medical systems for the treatment of diabetes, rheumatism, intestinal gas and malaria. The ethnicity of M. charantiais Asia, Africa and some parts of Europe where it is considered edible. Sewage sludge, a by-product of waste water treatment plant, contains several nutrients. These nutrients are known as beneficial for the better growth and good yield of the plants. The objective of this study is to optimize soil with different ratios of sewage sludge for increased growth of bioactive components in M. charantia. The plant was grown at six places; in soil containing 20%, 40%, 60% and 80% sewage sludge ratio as well as in pure soil and in pure sewage sludge. Fruit harvesting was carried out after 75 days. Methanol extract of M. charantia (Fruit) was subjected to analysis using GC-MS. Comparative quantification of 7,11-hexadecadienal, oleic Acid and stigmasterol were carried out. It has been found that the soil containing 60% sewage sludge yielded maximum quantity of 7,11-hexadecadienal, oleic Acid and stigmasterol. Therefore, optimization of soil with different ratios of sewage sludge is carried out and 60% ratio of sewage sludge in soil is recommended for the promising growth of Momordicacharantia.

Moving towards an energy neutral WWTP – the positive impact of ExelysTM continuous thermal hydrolysis in achieving this goal

2012 ◽  
Vol 7 (2) ◽  
Author(s):  
N. Gurieff ◽  
J. Bruus ◽  
B. Nielsen ◽  
Delphine Nawawi-Lansade ◽  
Marc Cantegril
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Positive Impact ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Electrical Energy ◽  
Waste Water Treatment Plant ◽  
Thermal Hydrolysis ◽  
Carbon Taxes ◽  
Wastewater Treatment Process

There is an increasing need for large wastewater treatment plants to generate as much electricity as possible from biogas. This not only ensures significant operational cost savings, but also improves the environmental profile of the plant. Enhanced digestion through the use of the ExelysTM continuous thermal hydrolysis process has the potential to help a large wastewater treatment plant move towards electrical energy neutrality. This article aims to use Csepel waste water treatment plant (WWTP) (3.5 million PE) in Budapest, Hungary as a case study to investigate the potential advantages an ExelysTM-DLD process could provide. The results indicate that despite already having an effective and efficient digestion process, through implementation of the ExelysTM-DLD process, Csepel has the potential to cover 65% of its total electrical needs from biogas. This is 33% more than the current situation. This also leads to a significantly improved NPV for the ExelysTM-DLD scenario, an important factor for the operator of a large wastewater treatment plant. When looking to the future, through the optimisation of the wastewater treatment process and the application of the ExelysTM-DLD, Csepel WWTP has the potential to be completely electrical energy neutral. This would be a significant financial advantage as electrical prices rise and carbon taxes are enforced.

scholarly journals Evsel Atıksu Arıtma Çamuru Uygulamalarının Domates Bitkisinin Verimi ve Besin Elementleri Alımına Etkisi

2020 ◽  
Vol 8 (7) ◽  
pp. 1508-1516
Author(s):  
Mustafa Öztürk ◽  
Şükrü Aslan ◽  
Ahmet Demirbaş
Keyword(s):  
Sewage Sludge ◽  
Dry Matter ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Tomato Plants ◽  
Different Doses ◽  
Macro Nutrients ◽  
Sludge Application

Use of sewage sludge in agriculture is an alternative disposal technique for this waste. Accordingly, the effects of using the sludge obtained from Sivas Waste Water Treatment Plant in different doses (0%, 1%, 2%, 3%, 4%, 5% (w/w) and chemical fertilization) on the yield and nutrient concentration of tomato plants were investigated. The study was carried out with three replications according to the experimental pattern of randomized plots in the plastic pots with the capacity of 3 kg under the greenhouse conditions of Plant and Animal Production Department of Sivas Cumhuriyet University. It has been determined that the weight of the plants roots, stems and green components dry matter increases due to the increasing sewage sludge application and the highest efficiency is in the sewage sludge application of 5%. In addition, it has been determined that the concentrations of nitrogen (N), phosphorus (P) and potassium (K) which are among the macro nutrients, tend to increase depending on the increasing dose of the sewage sludge. The concentrations of copper (Cu), manganese (Mn), iron (Fe), and zinc (Zn) which are among the micro nutrients, increased with the increasing amount of sludge. In this context, it is thought that the sludge can be used in plant breeding, provided that it falls within the boundaries of the legal legislation.

Kinetic study of pyrolysis of waste water treatment plant sludge

2011 ◽  
Vol 65 (2) ◽  
Author(s):  
Lukáš Gašparovič ◽  
Ivan Hrablay ◽  
Zuzana Vojteková ◽  
Ľudovít Jelemenský
Keyword(s):  
Waste Water ◽  
Water Treatment ◽  
Thermogravimetric Analysis ◽  
Sewage Sludge ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Preexponential Factor ◽  
Decomposition Process ◽  
Waste Water Treatment Plant ◽  
Heating Rates

AbstractActivated sewage sludge samples obtained from two different waste water treatment plants were investigated by thermogravimetric analysis. Due to a very high content of water in the sludge samples, these had to be dried at 160°C in an electrical oven in order to remove all adsorbed water. To ensure pyrolysis conditions, nitrogen atmosphere was applied. The pyrolysis decomposition process was carried out in the temperature range from ambient temperature to 900°C at three different heating rates: 2 K min−1, 5 K min−1, 10 K min−1. TGA and DTG curves of the decomposition processes were obtained. Temperature of onset decomposition, final temperature of decomposition, maximum decomposition rate, and decomposition temperature were determined by thermogravimetric analysis for both sludge samples used. The main decomposition process takes place at temperatures in the range from 230°C to 500°C. Above this temperature, there are only small changes in the mass loss which are often attributed to the decomposition of carbonates present in the sewage sludge samples. To determine the apparent kinetic parameters such as the activation energy and the preexponential factor, the so called Friedman isoconversional method was used. Because of the requirements of this method, initial and final parts of the decomposition process, where crossings of the decomposition lines occurred, were cut off. Obtained dependencies of the apparent activation energies and preexponential factors as a function of conversion were used backwards to calculate the modeled decomposition process of sewage sludge and the experimental data were in good accordance with the data obtained by simulation.

scholarly journals Effect Of Wood-Based Biochar And Sewage Sludge Amendments For Soil Phosphorus Availability

2015 ◽  
Vol 14 (1) ◽  
pp. 104-115 ◽  
Author(s):  
Vladimír Frišták ◽  
Gerhard Soja
Keyword(s):  
Sewage Sludge ◽  
Soil Phosphorus ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
P Availability ◽  
Toxic Heavy Metals ◽  
Application Rates ◽  
Mobile Forms

Abstract This study investigated the effects of two biochars (pyrolysed wood chips and garden clippings) on phosphorus (P) availability in a heavy-metal contaminated soil poor in phosphorus. Short-term 14-days incubation experiments were conducted to study how applications of biochars at different rates (1 and 5 %) in combination with (1:1) and without dried sewage sludge from a municipal waste water treatment plant (WWTP) affected the content of soil extractable P. For P-availability analyses deionized water, calcium acetate lactate (CAL), Mehlich 3 and Olsen extraction protocols were applied. In addition, the content of total and mobile forms of potentially toxic heavy metals (PTHM) was studied. Application of both biochars caused a significant decrease of PTHM available forms in sewage sludge amended soil samples. The concentration of total and available P increased with higher biochar and sewage sludge application rates.

scholarly journals CHANGES IN THE CONCENTRATION OF HEAVY METALS (CR, CD, NI) DURING THE VERMICOMPOSTING PROCESS OF SEWAGE SLUDGE / SUNKIŲJŲ METALŲ (CR, CD, NI) KONCENTRACIJŲ KAITA NUOTEKŲ DUMBLO VERMIKOMPOSTAVIMO PROCESO METU

2014 ◽  
Vol 6 (4) ◽  
pp. 362-367
Author(s):  
Aušra Zigmontienė ◽  
Indrė Liberytė
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Eisenia Fetida ◽  
Management Strategy ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Water Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Optimal Conditions ◽  
Sewage Sludge Treatment

Sewage sludge treatment and utilization is an important issue for a biodegradable waste management strategy. Heavy metals in sewage sludge complicate its use. Vermicomposting is one of the ways to improve the characteristics of sewage sludge and to reduce the residual concentrations of heavy metals. Study on changes in the concentration of heavy metals (Chromium, Nickel and Cadmium), when vermicomposting sewage sludge, was performed using Californian earthworms (Eisenia fetida). For that purpose, 60 kg of sewage sludge from Vilnius Waste Water Treatment Plant were taken thus inserting 1.5 kg of Californian earthworms into it. Optimal conditions for work (optimum temperature, moisture, pH) for earthworms to survive were maintained in the course of the study that lasted 120 days and was conducted in June – August. The samples of sewage sludge and earthworms were taken every 10 days. The concentrations of heavy metals in sewage sludge were measured using atomic absorption spectroscopy. Nuotekų dumblo tvarkymo ir naudojimo problema – svarbi biologiškai skaidžių atliekų tvarkymo strategijos dalis. Lietuvoje kasmet susidaro apie 80 tūkst. tonų nuotekų dumblo, o didžiausia dalis šio kiekio vis dar sandėliuojama valyklų aikštelėse. Nuotekų dumblas gali būti efektyviai naudojamas žemės ūkyje, tačiau sunkieji metalai, esantys nuotekų dumble, apsunkina jo naudojimą. Vienas iš būdų pagerinti dumblo savybes ir kartu sumažinti liekamąsias metalų koncentracijas – nuotekų dumblo vermikompostavimas. Sunkiųjų metalų (chromo, nikelio ir kadmio) koncentracijų kaitos vermikompostuojant nuotekų dumblą tyrimas atliktas naudojant Kalifornijos sliekus (Eisenia fetida). Tirta sunkiųjų metalų koncentracijos kaita viso kompostavimo proceso metu. Tyrimui naudotas nuotekų dumblas (60 kg) buvo paimtas iš Vilniaus miesto nuotekų valyklos ir į jį įleista 1,5 kg Kalifornijos sliekų. Viso tyrimo metu buvo palaikomos optimalios sąlygos sliekams gyvuoti ir veikti (optimali temperatūra, drėgmė, pH). Tyrimo trukmė – 120 parų (birželio–rugpjūčio mėnesiai), dumblo mėginiai imti 10 parų intervalu. Išmatuotos ir nustatytos sunkiųjų metalų – chromo, nikelio ir kadmio – koncentracijos nuotekų dumble.

New Design of Supercritical Water Oxidation Reactor for Sewage Sludge Treatment

2013 ◽  
Vol 774-776 ◽  
pp. 212-215 ◽  
Author(s):  
Shu Yang ◽  
Guang Wei Wang ◽  
Yuan Jian Xu
Keyword(s):  
Sewage Sludge ◽  
Supercritical Water ◽  
Water Oxidation ◽  
Waste Water Treatment ◽  
Treatment Plant ◽  
Waste Water Treatment Plant ◽  
Supercritical Water Oxidation ◽  
Reactor Performance ◽  
Inner Surface ◽  
Oxidation Reactor

The corrosion of reactor and salt precipitation are two critical obstacles that inhibiting the development of supercritical water oxidation (SCWO) in to a viable industrial process. A new design of double wall reactor has been developed in which SCWO reaction take place inside an inner tube (alumina or titanium, micro porous). The high pressure air layer between inner surface of reactor and surface of tube could prevent non-soluble materials, corrosion ingredients and inorganic salt depositing and attaching to inner surface, thus critical problems have been overcome. The new reactor performance was evaluated by processing sewage sludge from BeiBei waste water treatment plant. There were no salt plugging or corrosion observed in reactor after one month operation.

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