Current situation and future possibilities for the sewage sludge valorization

2014 ◽  
Vol 9 (4) ◽  
pp. 566-574 ◽  
Author(s):  
U. Ballabio ◽  
T. Vollmeier
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Efficient Solution ◽  
Environmental Problems ◽  
Current Situation ◽  
Point Of View ◽  
Phosphorus Recovery ◽  
Topical Issue ◽  
Sludge Disposal

Thermal treatment is an efficient solution for the sewage sludge disposal, able to deal with the environmental problems related to some harmful elements inside sludge itself, as heavy metals, hormones, pharmaceutical derivates etc. This presentation wants to show the several reliable technologies available today, able to fulfil the requirements for efficiency and cheapness. Other solutions with interesting potentialities are now in a research phase, and they show promising future possibilities of application also from the point of view of the environmental acceptability related to these technologies. In addition to the solutions for the sludge thermal treatment, it will be shown the issue of the phosphorus recovery from sewage sludge, a topical issue that will influence the choices for the sludge disposal in the next years.

scholarly journals Agro-Environmental Rationale of Sewage Sludge Processing and Application

2020 ◽  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Crop Yields ◽  
Conservation Agriculture ◽  
Fulvic Acids ◽  
Black Soil ◽  
Point Of View ◽  
Total Carbon ◽  
Mineral Fertilizers ◽  
Organic Mineral

Conservation agriculture is becoming a priority for Ukraine as well as for many countries of the world. It is a known fact that high content of heavy metals in the soil impairs fertility and carries the risk of crops translocation. An agroecological effect of obtaining and applying organic-mineral fertilizers has been insufficiently studied so far. The purpose of the work is to determine possibilities to produce new organic-mineral fertilizers based on sewage sludge with enhanced adsorbing properties, to establish their agroecological efficiency. Methods. Field, laboratory-analytical, statistical-mathematical. Results. From the agroecological point of view, the production process of organic-mineral fertilizers based on the sewage sludge of Kharkiv is justified. It allows us to expand functional capabilities of reagents, enhancing adsorbing properties of heavy metals. It is proved the advantage of organic-mineral fertilizers over the traditional ones on chernozem typical. After fertilization, the content of total carbon in the soil increased, the content of humic acids increased by 1,5 – 2,8 times, fulvic acids – by 1,1 – 1,7 times, the total sum of humic substances – by 1,3 – 2,1 times compared with no fertilizer option. It is established that application of organic-mineral fertilizers promotes blocking of heavy metals in soil and prevents translocation to plant. Maximum yields of corn were obtained after the local application of granular organic-mineral fertilizers – the yield increase was 41% compared to the control, after introduction of bulk fertilizers – 32% compared to the control. Profit was $ 23 -36 per hectare. Conclusions. The process of organic-mineral fertilizers production on the basis of sewage sludge in Kharkiv is substantiated from the agro-ecological point of view. Agroecological and agrochemical efficacy of sewage sludge use as compared to organic and mineral fertilizers applied in equivalent doses separately was established on the typical heavy loam chernozem. After introduction of organic-mineral fertilizers based on sewage sludge a significant increase in the concentration of trace elements and heavy metals was found in the black soil but these indicators did not exceed the established maximum permissible concentrations. The implementation of the proposed technology will reduce bioavailability of heavy metals and their mobility in the soil which, in turn, impedes their accumulation in products. It is expected to increase soil fertility, crop yields and obtain environmentally friendly and safe products due to the stable composition of innovative fertilizers.

THE PROBLEM OF DISPOSAL AND DESTRUCTION OF SEWAGE SLUDGE AND ITS SOLUTIONS (REVIEW)

2017 ◽  
pp. 35-48
Author(s):  
I.M. Karp ◽  
K.Ye. Pyanykh ◽  
Ye.Ye. Nikitin
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Industrial Wastewater ◽  
Industrial Process ◽  
High Hardness ◽  
Thermal Methods ◽  
Sludge Disposal ◽  
Oxidative Pyrolysis ◽  
Agricultural Use ◽  
Harmful Substances

Sewage sludge of cities usually are formed of municipal and industrial wastewater. They contain many harmful substances such as heavy metals, mineral substances, harmful substances of organic origin wastes (solid domestic wastes, feces, etc.), bacterial pollutants. The problem of utilizing and secure disposal of precipitation of urban wastewater (WWS) is a global. It is not solved fully by this time. European trends of sewage sludge disposal are the reduction or total ban on their agricultural use and disinfecting organic pollutants by thermal methods. Acquires distribution WWS combustion in a fluidized bed. Low-temperature technology of sewage sludge disposal in which the heavy metals remain in the solid residue of the process are interesting. This are pyrolysis, oxidative pyrolysis and gasification. The Gas Institute of NAS of Ukraine conducted preliminary tests of utilizing of dry granular WWS in the reversed process of gasification. Producer gas and pellets with high hardness were obtained; pellets can be used as fillers in construction. Technological scheme of the industrial process is proposed. Bibl. 24, Fig. 7, Tab. 1.

Heavy Metals and Persistent Organics at a Sewage Sludge Disposal Site

1983 ◽  
Vol 12 (3) ◽  
pp. 311-316 ◽  
Author(s):  
J. C. Baxter ◽  
M. Aguilar ◽  
K. Brown
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Disposal Site ◽  
Sludge Disposal

Influence of chlorine, sulfur and phosphorus on the volatilization behavior of heavy metals during sewage sludge thermal treatment

2013 ◽  
Vol 31 (10) ◽  
pp. 1012-1018 ◽  
Author(s):  
Jingde Luan ◽  
Rundong Li ◽  
Zhihui Zhang ◽  
Yanlong Li ◽  
Yun Zhao
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Thermal Treatment ◽  
Volatilization Behavior

scholarly journals Opportunities regarding the use of technologies of energy recovery from sewage sludge

2021 ◽  
Vol 3 (9) ◽  
Author(s):  
Anca Maria Zaharioiu ◽  
Felicia Bucura ◽  
Roxana Elena Ionete ◽  
Florian Marin ◽  
Marius Constantinescu ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Energy Recovery ◽  
Alternative Fuels ◽  
Point Of View ◽  
List Type ◽  
Pyrolysis Oil ◽  
Pyrolysis Process ◽  
Pyrolysis Gas ◽  
Bio Oil

Abstract Based on the global need to efficiently eliminate highly produced amounts of sewage sludge, alternative technologies are required to be practically developed. Reduction of sewage sludge waste quantities with energy recovery is the most important and modern practice, with least possible impact on the environment. Appropriate technologies for treating and disposal sewage sludge are currently considered: incineration, gasification and pyrolysis. The main products generated during the pyrolysis process are bio-gas, bio-oil and bio-residue, providing sustainable fuels/ biofuels and adsorbents. Compared to other disposal methods of sewage sludge, pyrolysis has advantages in terms of the environment: waste in small quantities, low emissions, low level of heavy metals. From a technological point of view, pyrolysis is the most efficient in relation to its final products, pyrolysis oil, pyrolysis gas and solid residue that can be transformed into CO2 adsorbent with the help of chemical and thermal activation processes. The incineration process of sewage sludge has a number of disadvantages both environmentally and technologically: organic pollutants, heavy metals, toxic pollutants and ash resulting from combustion that needs a disposal process. A comparison of different types of sewage sludge elimination for the energy recovery is described in the present paper. Article Highlights Sewage sludge is a waste in increasing quantities, which requires disposal and energy recovery, in a clean way for the environment. The pyrolysis process of sewage sludge is the cleanest method of its recovery. Pyrolysis products, bio-oil, syngas and biochar, can be used as alternative fuels to fossil fuels. The pyrolysis process of the sewage sludge is the most advantageous from the point of view of the obtained products and of the environment, in comparison with the incineration and gasification processes.

Potentials of using nanofiltration to recover phosphorus from sewage sludge

2008 ◽  
Vol 57 (5) ◽  
pp. 707-714 ◽  
Author(s):  
C. Niewersch ◽  
C. N. Koh ◽  
T. Wintgens ◽  
T. Melin ◽  
C. Schaum ◽  
...  
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Product Recovery ◽  
Phosphorus Recovery ◽  
Nanofiltration Membranes ◽  
Sewage Sludge Ash ◽  
Model Solutions ◽  
Treated Sewage ◽  
Increasing Demand ◽  
Sludge Ash

Due to the depletion of mineral phosphorus resources there is an increasing demand for efficient phosphorus recovery technologies. In this study the potential of nanofiltration to recover phosphorus from pre-treated sewage sludge is investigated. The efficiency of three commercial nanofiltration membranes (Desal 5DK, NP030; MPF34) was tested using model solutions. Desal 5DK showed the best selectivity for phosphorus. A pH of lower than 1.5 was found to be most suitable. Desal 5DK was used on four different sewage sludge ash eluates and on one sewage sludge. In these experiments it was shown that a separation of phosphorus from undesired components such as heavy metals was possible with significant variations in the efficiency for the different ash and sludge types. Additionally the achievable product recovery was investigated with model solutions. A product recovery of 57.1% was attained for pH 1 and 41.4% for pH 1.5.

Basic investigation on the chemical forms of heavy metals in a sewage treatment plant

2000 ◽  
Vol 42 (9) ◽  
pp. 159-165 ◽  
Author(s):  
H. Morita ◽  
H. Tsuboi
Keyword(s):  
Heavy Metals ◽  
Sewage Sludge ◽  
Sewage Treatment ◽  
Sewage Treatment Plant ◽  
Treatment Plant ◽  
Energy Resource ◽  
Point Of View ◽  
Raw Material ◽  
Chemical Forms ◽  
Basic Study

Sewage sludge mainly consists of organic matter, and it is rich in nutrients. Therefore, sewage sludge is beneficial as an energy resource and as a raw material for fertilizer. However, heavy metals in it are the obstacle to utilization of sludge. This study was conducted in order to know the chemical forms of heavy metals and their behavior in a sewage treatment plant as a basic study for development of technology to reduce heavy metals in sludge. Chemical methods and biological methods, such as extraction using acid, bacteria leaching, are applied to reduce heavy metals. In using these methods, the efficiency depends on the chemical forms of heavy metals. From this point of view, factors, which affect the chemical forms of heavy metals, were investigated through the survey at some plants of different conditions. Besides, experiments on the anaerobic digestion process, in which the chemical forms of heavy metals were expected to change, were conducted. As the results of these studies, it was found that the chemical forms of heavy metals and their behavior vary according to the species of heavy metals. In comparison of zinc (Zn), copper (Cu) and nickel (Ni), Cu was found to be changed most easily into a stable chemical form such as carbonate and sulfide. Zn was the second to Cu in its tendency to be stabilized. As for Ni, the tendency was further less than Zn.

scholarly journals Correction to: A review of phosphorus recovery from different thermal treatment products of sewage sludge

2020 ◽  
Vol 2 (1) ◽  
pp. 79-79
Author(s):  
Xiangdong Meng ◽  
Qunxing Huang ◽  
Jie Xu ◽  
Huaping Gao ◽  
Jianhua Yan
Keyword(s):  
Sewage Sludge ◽  
Thermal Treatment ◽  
Phosphorus Recovery

Comprehensive Evaluation of Poly-Phosphate Release from Sewage Sludge with Thermal Treatment

2015 ◽  
Vol 768 ◽  
pp. 476-483
Author(s):  
Ming Yang Zhang ◽  
Jian Wei Du ◽  
Takahiro Kuba ◽  
Yong Wen
Keyword(s):  
Sewage Sludge ◽  
Thermal Treatment ◽  
Comprehensive Evaluation ◽  
Hot Spot ◽  
Indirect Evidence ◽  
Metal Cations ◽  
Heating Time ◽  
Phosphorus Recovery ◽  
Heating Process ◽  
The World

Phosphorus is a necessary nutrient element to all lives in the world. Distribution and phosphate rock reserves in the world disclose shortage crisis of phosphorus. Thus phosphorus recovery has been a research hot spot in the world. Mr.Ohtake’ group [1] recommended a new method to recover phosphorus from sewage sludge during heating process. It seems that nearly 90% of the poly-phosphate (poly-P) and 87% of total phosphate (T-P) can be released from cultivated sludge by heating at 70 °C for 1 hour. Meanwhile, released poly-P can precipitate with Ca in neutral condition without any pH adjustment. Sewage sludge was used in this research to identify its performance during thermal treatment. With the increase of temperature and heating time, release of poly-P and T-P increased obviously. However, poly-P would be hydrolyzed when temperature was higher than 80 °C. With addition of EDTA, release of poly-P increased nearly 100%. Migration of metal cations during thermal treatment can provide indirect evidence which kinds of metal cations would make impediment on poly-P release. A novel phenomenon was observed poly-P mixed with ortho-phosphate can precipitate with NH4+ and Mg2+ as struvite at pH 8.5.

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