Procedures of determining organic trace compounds in municipal sewage sludge—a review

Recently, more and more attention has been paid to the removal of nickel ions due to their negative effects on the environment and human health. In this research, fly ash obtained as a result of incineration of municipal sewage sludge with the use of circulating fluidized bed combustion (CFBC) technology was used to analyze the possibility of removing Ni(II) ions in adsorption processes. The properties of the material were determined using analytical methods, such as SEM-EDS, XRD, BET, BJH, thermogravimetry, zeta potential, SEM, and FT-IR. Several factors were analyzed, such as adsorbent dose, initial pH, initial concentration, and contact time. As a result of the conducted research, the maximum sorption efficiency was obtained at the level of 99.9%. The kinetics analysis and isotherms showed that the pseudo-second order equation model and the Freundlich isotherm model best suited this process. In conclusion, sewage sludge fly ash may be a suitable material for the effective removal of nickel from wastewater and the improvement of water quality. This research is in line with current trends in the concepts of circular economy and sustainable development.

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Determine the Moisture Distribution in Sewage Sludge by Drying Differential

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.665.404 ◽

2014 ◽

Vol 665 ◽

pp. 404-407 ◽

Cited By ~ 1

Author(s):

Wan Yu ◽

Pei Sheng Li

Keyword(s):

Sewage Sludge ◽

Interstitial Water ◽

Bound Water ◽

Free Water ◽

High Accuracy ◽

Moisture Distribution ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Hot Air ◽

Critical Water Content

Moisture distribution in sewage sludge was considered as the essential of thermal drying. Some methods were given in literatures to test the moisture distribution, but there was no standard method to determine the critical water content between different kinds of water. The municipal sewage sludge was dried by hot air in this work. Based on the drying curve, the derivative of drying rate with respect to dry basis moisture content was brought out to analyze the moisture distribution in sewage sludge. Results show that this method can easily determine the free water, interstitial water, surface water and bound water with a high accuracy. The present work can provide new insight to determine the moisture distribution in sewage sludge, which was still lacking in the literatures.

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Dried Municiple Sewage Sludge Gasification Experiment in Dual Fluidized Bed

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.383-390.3799 ◽

2011 ◽

Vol 383-390 ◽

pp. 3799-3804

Author(s):

Xiao Xu Fan ◽

Lei Zhe Chu ◽

Li Guo Yang

Keyword(s):

Fly Ash ◽

Sewage Sludge ◽

Fluidized Bed ◽

Calorific Value ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Test Results ◽

Leaching Toxicity ◽

Dual Fluidized Bed ◽

Hot Test

The fuel characteristics of municipal sewage sludge are suitable for dual fluidized bed(DFB) gasification, which can get middle calorific value gas through volatile pyrolysis, and reduce volume through char combustion. The hot test results of municipal sewage sludge on DFB rig were showen that the temperature distribution along combustor heigh is uniform, and the carbon content of fly ash is about 2~3%. In the experiment, with the increase of gasifier temperatrue, the more volatile of the sewage sludge was pyrolyzed. When the temperature of the gasifier reached 800°C, the calorific value of gas was 6.9MJ/Nm3; the emissions of SO2, NOx and HCl were appropriate to the standard. The leaching toxicity of heavy metal of the fly ash was lower than the discharge standard.

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Assessment of Environmental Quality of Soil Fertilized Grapefruit Trees with Municipal Sewage Sludge

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.671-674.2736 ◽

2013 ◽

Vol 671-674 ◽

pp. 2736-2741

Author(s):

Yin An Ming ◽

Tao Tao

Keyword(s):

Sewage Sludge ◽

Environmental Quality ◽

Sewage Treatment ◽

Sewage Treatment Plant ◽

Treatment Plant ◽

Land Application ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Limiting Factor

To reuse municipal sewage sludge safely, experiment was carried out on grapefruit trees fertilized with composted sludge from Shiweitou Sewage Treatment Plant in Xiamen City of China, and a method was introduced of how to assess the environmental quality of grapefruit trees soil fertilized with sludge by Set Pair Analysis (SPA) model. The results showed that the soil in the surface layer (0-15cm) and the deeper layer (15-30cm) was less clean, and the environment of soil was not polluted. Thus it was feasible to use sludge as fruit fertilizer. The maximum service life of sludge for continuous land application was estimated by taking Cd as the limiting factor, which would provide scientific guide and technical support for safe land application of sludge.

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Analysing surface water-groundwater interactions on selected sites of the River Moselle: Identifying transport processes along an important inland waterway in Germany

10.5194/egusphere-egu21-11973 ◽

2021 ◽

Author(s):

Simon Mischel ◽

Michael Engel ◽

Sabrina Quanz ◽

Dirk Radny ◽

Axel Schmidt ◽

...

Keyword(s):

Electrical Conductivity ◽

Surface Water ◽

Transport Processes ◽

Main Stream ◽

Flow Conditions ◽

Inland Waterway ◽

Trace Compounds ◽

Organic Trace Compounds ◽

Longitudinal Sampling ◽

Organic Trace

Hydraulic engineering structures like locks affect the natural hydraulic conditions and have a relevant impact on surface water &#8211; groundwater interactions due to enlarging the hydraulic gradient. For this, these sites are excellent areas to study associated flow paths, mass transport and their spatial and temporal variability in higher detail. However, no large-scale study at an inland waterway is available in Germany until now.Our work aims to close this gap by applying a multiparameter approach for analyzing surface water-groundwater-interactions by using pH, electrical conductivity, major ions in combination with various other tracers like stable water isotopes, 222-Rn, and tritium. In this context, we also investigate the usability of organic trace compounds and their associated transformation products as potential new tracers.The main study approach is based on the hypothesis that i) gaining stream sections show relatively high 222-Rn concentrations originating from discharging groundwater and ii) losing stream sections which are characterized by low 222-Rn concentrations as well as lower tritium and organic trace compounds inventories compared to unaffected areas.During different flow-scenarios of the river Moselle, we test these hypotheses by means of a high-resolution longitudinal sampling at 2 km intervals of the main stream (along 242 km) and its major tributaries in combination with groundwater sampling at numerous wells.Here, we present the first results of the longitudinal sampling campaign of the river Moselle in October 2020, which took place during intermediate flow conditions (Q=200 m&#179;/s). We used on-site and in-situ 222-Rn measurements and electrical conductivity as a tracer to immediately identify zones along the Moselle with increased groundwater inflow.With the use of these tracers, we will deepen the conceptual process understanding of surface water &#8211; groundwater interactions occurring at larger streams and during different flow conditions, which may lead to a general river characterization of losing and gaining stream reaches. Moreover, understanding the sources of water compounds and the processes involved during transportation and transformation is crucial for maintaining a good quality of the water body, which is key for proper water management. The findings obtained in the region of the Moselle river might be further transferred to other waterways and support decision making.

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Structure characteristics of bio-char generated from co-pyrolysis of wooden waste and wet municipal sewage sludge

Fuel Processing Technology ◽

10.1016/j.fuproc.2018.11.005 ◽

2019 ◽

Vol 183 ◽

pp. 48-54 ◽

Cited By ~ 19

Author(s):

Qindong Chen ◽

Hu Liu ◽

JaeHac Ko ◽

Huanan Wu ◽

Qiyong Xu

Keyword(s):

Sewage Sludge ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

Structure Characteristics

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Elementary analysis and energetic potential of the municipal sewage sludges from the Gdańsk and Kościerzyna WWTPs

E3S Web of Conferences ◽

10.1051/e3sconf/20182600004 ◽

2018 ◽

Vol 26 ◽

pp. 00004

Author(s):

Arkadiusz Ostojski

Keyword(s):

Sewage Sludge ◽

Water Content ◽

Calorific Value ◽

High Water ◽

Municipal Sewage ◽

Municipal Sewage Sludge ◽

High Water Content ◽

Sewage Sludges ◽

Heating Value ◽

Elementary Analysis

This paper aims to present municipal sewage sludge (MSS) elementary analysis and energetic potential based on measurement of heat of combustion (higher heating value HHV) and calculation of calorific values (lower heating value LHV). The analysis takes into the consideration water content in sewage sludge, at different utilization stages, in wastewater treatment plants in Gdańsk Wschód and Kościerzyna – Pomeranian Voivodeship. The study yielded the following results (in % dry matter): ash 19÷31 %, C - 31÷36 %, H - 5÷6 %, N - 4÷6 %, O - 28÷32 %, S – 1 %. Calorific value of stabilized sludges in Gdańsk was on average 13.8÷15 MJ/kg. In case of sludges not undergoing digestion from Kościerzyna WWTP, the calorific value was at the level of 17.5 MJ/kg. Thus, sewage sludges are good energy carriers. High water content though is the problem, as it lowers the useful effect of heat. There is no alternative for thermal sewage sludge neutralization, which is in conformity with valid Polish National Waste Management Plan (KPGO 2022).

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