scholarly journals Adsorption Behaviors and Removal Efficiencies of Inorganic, Polymeric and Organic Phosphates from Aqueous Solution on Biochar Derived from Sewage Sludge of Chemically Enhanced Primary Treatment Process

Water ◽  
2018 ◽  
Vol 10 (7) ◽  
pp. 869 ◽  
Author(s):  
Guoren Xu ◽  
Zhao Zhang ◽  
Linyu Deng
Keyword(s):  
Aqueous Solution ◽  
Sewage Sludge ◽  
Treatment Process ◽  
Primary Treatment ◽  
Organic Phosphates ◽  
Adsorption Behaviors ◽  
Removal Efficiencies ◽  
Chemically Enhanced Primary Treatment

scholarly journals Chemically enhancing primary clarifiers: model-based development of a dosing controller and full-scale implementation

2016 ◽  
Vol 75 (5) ◽  
pp. 1185-1193 ◽  
Author(s):  
Sovanna Tik ◽  
Peter A. Vanrolleghem
Keyword(s):  
Treatment Process ◽  
Control Strategies ◽  
Primary Treatment ◽  
Full Scale ◽  
Pollution Load ◽  
Controlled System ◽  
Particulate Pollution ◽  
Treatment Performance ◽  
Treatment Processes ◽  
Chemically Enhanced Primary Treatment

Chemically enhanced primary treatment (CEPT) can be used to mitigate the adverse effect of wet weather flow on wastewater treatment processes. In particular, it can reduce the particulate pollution load to subsequent secondary unit processes, such as biofiltration, which may suffer from clogging by an overload of particulate matter. In this paper, a simple primary clarifier model able to take into account the effect of the addition of chemicals on particle settling is presented. Control strategies that optimize the treatment process by chemical addition were designed and tested by running simulations with this CEPT model. The most adequate control strategy in terms of treatment performance, chemicals saving, and maintenance effort was selected. Full-scale implementation of the controller was performed during the autumn of 2015, and the results obtained confirmed the behaviour of the controlled system. Practical issues related to the implementation are presented.

scholarly journals Optimizing Chemically Enhanced Primary Treatment Processes for Simultaneous Carbon Redirection and Phosphorus Removal

Water ◽  
2019 ◽  
Vol 11 (3) ◽  
pp. 547 ◽  
Author(s):  
Tianchen Dong ◽  
Wudneh Shewa ◽  
Kyle Murray ◽  
Martha Dagnew
Keyword(s):  
Ferric Chloride ◽  
Phosphorus Removal ◽  
Energy Recovery ◽  
Treatment Process ◽  
Primary Treatment ◽  
Full Scale ◽  
Operating Conditions ◽  
Treatment Processes ◽  
Chemically Enhanced Primary Treatment ◽  
The Relationship

There has been increased interest towards maximizing wastewater energy recovery by enhancing the carbon captured through the primary treatment process such as chemically enhanced primary treatment (CEPT). This research was conducted to optimize the CEPT performance in terms of redirection of carbon and nutrients in both bench- and full-scale operations. In order to improve the CEPT process, the performance of ferric chloride and seven types of polymers were evaluated through jar testing. The optimal coagulant (15 mg/L ferric chloride) and flocculant (0.5 mg/L poly aluminum chloride (PACl)) combination achieved total COD, soluble COD, total suspended solids (TSS), and total phosphorus (TP) removal efficiencies of 76, 58, 89, and 84, respectively, in a full-scale primary clarifier operation. In doing so the organic matter and phosphorus were concentrated in CEPT sludge, making them available for recovery. Furthermore, the relationship between influent characteristics and removal rates under varying operating conditions was investigated. It was found that soluble COD removal appeared to be season-dependent, and TSS removals were independent of influent TSS concentrations in all scenarios. The removal of tCOD, sCOD, and TP had a positive relationship with their corresponding concentrations when the polymer Alcomer® 120L was used, whereas no correlation between removal and concentration was observed with PACl.

Geotechnical characterization of dewatered sewage sludge for landfill disposal

2002 ◽  
Vol 39 (5) ◽  
pp. 1139-1149 ◽  
Author(s):  
Irene M.C Lo ◽  
W W Zhou ◽  
K M Lee
Keyword(s):  
Hong Kong ◽  
Hydraulic Conductivity ◽  
Sewage Sludge ◽  
Primary Treatment ◽  
Geotechnical Properties ◽  
Overburden Pressure ◽  
Direct Shear Tests ◽  
Chemically Enhanced Primary Treatment ◽  
Dewatered Sewage Sludge ◽  
Landfill Disposal

The disposal of increased quantities of dewatered sewage sludge to landfills may cause geoenvironmental problems such as leachability, total and differential settlement, and slope stability of the waste during disposal. This study investigates the geotechnical properties of the dewatered sewage sludge generated from chemically enhanced primary treatment (CEPT) in Hong Kong. Compaction test results show that CEPT sludge exhibits compaction characteristics similar to those of clayey soils; however, the lowest hydraulic conductivity of CEPT sludge does not occur near the wet side of its optimum water content. The consolidation behavior of CEPT sludge does not follow the conventional Terzaghi's theory. Under an overburden pressure higher than 24 kPa, the relationship between the logarithm of the hydraulic conductivity (logk) and the void ratio (e) is linear. Results from direct shear tests reveal that, for CEPT sludge, slopes of 20° can probably be constructed during the landfill operation without causing sliding problems. Compared with the disposal of pure CEPT sludge, the co-disposal of dewatered sewage sludge with other solid wastes commonly found in Hong Kong results in lower compressibility, smaller settlement, but higher hydraulic conductivity.Key words: co-disposal, geotechnical properties, landfill disposal, sewage sludge.

Treatment and Quality of Sewage Sludge in Germany - Results of a Survey

2007 ◽  
Vol 2 (1) ◽  
Author(s):  
A. Meda ◽  
C. Schaum ◽  
M. Wagner ◽  
P. Cornel ◽  
A. Durth
Keyword(s):  
Sewage Sludge ◽  
Treatment Process ◽  
Wastewater Treatment Plants ◽  
Current Status ◽  
Sludge Treatment ◽  
Sewage Sludge Treatment ◽  
Treatment And Disposal ◽  
German Association ◽  
Entire Treatment

TIn 2004, the German Association for Wastewater, Water and Waste (DWA) carried out a survey about the current status of sewage sludge treatment and disposal in Germany. The study covered about one third of the wastewater treatment plants and about two thirds of the entire treatment capacity (expressed in population equivalents) in Germany. This provides an up-to-date and representative database. The paper presents the most important results regarding sludge treatment, process engineering, current disposal paths and sewage sludge quality.

Pilot Scale Testing of a New Radium-226 Removal Process

1985 ◽  
Vol 20 (2) ◽  
pp. 55-67
Author(s):  
W.B. Anderson ◽  
P.M. Huck ◽  
T.M.R. Meadley ◽  
T.P. Hynes
Keyword(s):  
Treatment Process ◽  
No Reduction ◽  
High Surface ◽  
High Surface Area ◽  
Barium Chloride ◽  
Pilot Scale ◽  
Activity Levels ◽  
New Process ◽  
Removal Efficiencies ◽  
New Treatment

Abstract This paper describes the on-going pilot scale development of a new treatment process designed to remove radium-226 from uranium milling effluents. Presently, decants from Canadian uranium mining and milling tailings areas are treated with barium chloride to remove radium-226 prior to discharge into the environment. This is usually accomplished in large natural or man-made ponds which provide an opportunity for a (Ba,Ra)SO4 precipitate to form and subsequently settle. Sand filtration is sometimes used as a polishing step. This new process differs from conventional and other experimental processes in that it involves the use of a fluidized bed to facilitate the deposition of a (Ba,Ra)SO4 precipitate on a granular medium of high surface area. As a stand-alone treatment process, the new process is consistently able to reduce incoming radium-226 activity levels by 90-99%. Effluent levels of 10 pCi/L (0.370 Bq/L) or less have been achieved, depending on the influent activity levels. Recent testing of the process as a polishing step has demonstrated radium removal efficiencies up to 60% when the process influent was already less than 5 pCi/L (0.185 Bq/L). The process has been operated at temperatures ranging from 26°C down to 0.3°C with no reduction in efficiency. In contrast to treatment times in the order of days for conventional settling pond systems and hours for mechanical stirred tank/filtration systems, the new process is able to achieve these radium removal efficiencies in times on the order of one minute.

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