Sludge Dewatering with Filter Presses and Centrifuge Followed by Sludge Incineration at the Wastewater Treatment Plant Düsseldorf-Nord, F.R.G.

1984 ◽  
Vol 16 (12) ◽  
pp. 523-530 ◽  
Author(s):  
H Kuhlmann
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Industrial Waste Water ◽  
Construction Costs ◽  
Sludge Dewatering ◽  
Primary Sludge ◽  
Sludge Incineration ◽  
Treatment Processes ◽  
Agricultural Use

The wastewater of approx. 800 000 inhabitants and population equivalents is treated at the mechanical aeration wastewater treatment plant Düsseldorf-Nord. The dry-weather flow amounts to 145 000m3/d, of which 40 % is industrial waste water. The combined sludge-primary sludge from the mechanical part and waste-activated sludge from the final settling tanks has been anaerobically stabilized, then chemically conditioned, dewatered in filter presses and to a large extent used agriculturally. Satisfactory performance could be obtained with this type of sludge treatment and no special problems occurred. As agricultural use has become more restricted due to new laws on sludges from treatment processes, and no adequate land-fill is available, the present plant has been expanded by a multiple hearth incinerator, to minimize the sludge volume. At the same time, a centrifuge, after which the dewatered sludge is mixed with ashes, has been installed in the dewatering plant. The construction costs for the installation of the multiple hearth furnace and centrifuge were approx. 18,5 million DM.

Zoogleal Clusters and Sludge Dewatering Potential in an Industrial Activated-Sludge Wastewater Treatment Plant

2000 ◽  
Vol 72 (1) ◽  
pp. 56-64 ◽  
Author(s):  
Curtis A. Lajoie ◽  
Alice C. Layton ◽  
Ingrid R. Gregory ◽  
Gary S. Sayler ◽  
Don E. Taylor ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Activated Sludge ◽  
Wastewater Treatment Plant ◽  
Treatment Plant ◽  
Sludge Dewatering

Heavy Metal Potential of Domestic Biological Wastewater Treatment Plant Sludge

2021 ◽  
Vol 4 (1) ◽  
pp. 90-113
Author(s):  
T.D.C. Pushpakumara ◽  
◽  
W.G.T. Sandakelum ◽  
Keyword(s):  
Heavy Metal ◽  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Metal Content ◽  
Treatment Plant ◽  
Nutrient Content ◽  
Heavy Metal Content ◽  
Treatment Processes ◽  
Secondary Sludge

The use of sludge as fertilizers helps to the recycling of nutrients to the environment due to its beginning from wastewater and therefore relatively high content of nutrients and organic matter. However, wastewater does also contain hazardous compounds like heavy metals and micro pollutants which eventually are separated to the sludge during the treatment processes at the wastewater treatment plant. In order to improve the sludge quality, source tracking is a relatively cheap and effective way to find and eliminate hazardous compounds and prevent them from ending up in the sludge. The aim with this thesis was to investigate the fertilizer potential in sludge from wastewater treatment plant. The sludge is analyzed in terms of nutrient and heavy metal contents as well as physiochemical parameters. In order to determine the potential as fertilizer, the quality of the sludge is compared with other fertilizer alternatives, other sludge types and regulations for sludge use in agriculture. The work with sludge quality improvements in Gaborone is also investigated. Sludge from different stages along the treatment processes were collected in order to see differences in quality related to the treatment. The results shows that the samples of primary an aerobically treated sludge tend to have higher heavy metal content than the secondary sludge. The quality of the dry sludge samples indicates lower nutrient content than both the primary and secondary sludge, but similar heavy metal content. The analysis of dry sludge from indicates a low nutrient value and high heavy metal content in comparison to other selected fertilizer options and sludge from other. The processes for removal of nutrients from the wastewater are an important factor for the nutrient content in the sludge. Keywords wastewater; fertilizers; nutrients; sludge treatment

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.

Improvement of Wastewater Treatment Plant Projects

1990 ◽  
Vol 22 (7-8) ◽  
pp. 309-310
Author(s):  
Edward S. Kempa
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Construction Costs ◽  
The Third ◽  
Plant Construction ◽  
Modern Idea

It comes about that the construction of a wastewater treatment plant has already started and a new, more modern idea of treatment or plant construction - lower in costs - arises. The investor has the choice to be for or against the proposed changes. The following examples will show the kind of improvements which have been made at three Polish wastewater treatment plants. The first two plants have worked very well for years; the erection of the third will start soon. The construction costs of the plants in question were 50–60% of the previously calculated, separate from the simpler construction.

Importance of microbial adaptation for concentrate management in wastewater reuse process

2018 ◽  
Vol 30 (4) ◽  
pp. 719-731 ◽  
Author(s):  
Chungman Moon ◽  
Yongtae Ahn ◽  
Tae-Jin Lee ◽  
Yuhoon Hwang
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Wastewater Reuse ◽  
Treatment Plant ◽  
Poor Performance ◽  
Microbial Adaptation ◽  
Treatment Processes ◽  
Concentrate Treatment ◽  
High Concentrations ◽  
Concentrate Management

Wastewater reuse has gained attention as an alternative and sustainable water resource. Reverse osmosis has been widely applied for wastewater reuse; however, generation of concentrate stream is the main drawback. Concentrate stream contains high concentrations of contaminants, and therefore, it should be properly treated prior to being discharged into a water body. Several technologies have been suggested for concentrate management, but the most common option is returning this stream to a wastewater treatment plant where a wastewater reuse plant is located. In this study, we investigated the feasibility of concentrate management by returning the concentrate to a wastewater treatment facility as a part of influent. The characteristics of the concentrate were extensively monitored, and it was verified that it contained high concentrations of salt and hardly biodegradable organics, which impede their application in biological wastewater treatment processes. The effect of seeding sludge was investigated using two different types of seeding sludge, adapted and unadapted. The adapted sludge taken at the wastewater treatment plant located at the wastewater reuse facility showed much better performance in terms of organic and nutrients removal. Moreover, the performance was recovered by a few days of additional adaptation time. However, the seeding sludge taken from another wastewater treatment plant (unadapted) showed poor performance due to different influent characteristics, especially salt concentration. Therefore, it could be concluded that the microbial adaptation step is very important for effective concentrate treatment when it is being returned to a wastewater plant as influent.

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