scholarly journals Full scale optimisation of sludge dewatering and phosphate removal at Harnaschpolder wwtp (The Hague, NL)

2018 ◽  
Vol 13 (1) ◽  
pp. 21-29 ◽  
Author(s):  
M. Mulder ◽  
K. Appeldoorn ◽  
P. Weij ◽  
R. van Kempen
Keyword(s):  
Magnesium Hydroxide ◽  
Full Scale ◽  
Phosphate Removal ◽  
Iron Chloride ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Effluent Quality ◽  
Reject Water ◽  
Dewatered Sludge ◽  
Solids Content

Abstract At Harnaschpolder wwtp phosphate removal from wastewater and sludge dewatering is optimised by dosing magnesium hydroxide to digested sludge. To optimise sludge dewatering and phosphate removal, a full-scale test has been executed since August 2015 using temporary equipment. In this test magnesium hydroxide is added to the digested sludge buffer. Significant positive results are achieved. An excellent quality of the reject water is obtained, through which the phosphorus load in this reject water returned to head of works is negligible. This decrease in combination with other optimisations are beneficial for the biological phosphorus removal process. In 2016 the phosphorus effluent quality remained constant, while 42% less iron chloride was added to meet the legal phosphorus effluent quality requirements (yearly moving average Ptotal < 1.0 mg P/l). The polymer usage decreased by 25% and the year average dry matter content of the dewatered sludge increased from 22% in 2014 to 24% in 2016. Struvite scaling or blockage is avoided in piping, pumps or dewatering equipment, through optimised control of dosage of magnesium hydroxide. The full-scale test results prove that the addition of magnesium hydroxide to digested sludge leads to a significant cost reduction and major environmental benefits. In 2017 a permanent installation will be realised. The magnesium hydroxide dosage will be further optimised based on lessons learnt. Also an improved operation control of sludge dewatering is possible through additional in-line measurements for dry solids content of dewatered sludge. It is therefore expected that results will further improve concerning the use of iron chloride and polymers, dry solids content of dewatered sludge and phosphate effluent quality. Through this optimisation, the operating costs1 of Harnaschpolder wwtp are reduced by over 4%. The return on investment is estimated at 1.5 years.

A Comparative Study of Full-Scale Sludge Dewatering Equipment

1993 ◽  
Vol 28 (1) ◽  
pp. 37-45 ◽  
Author(s):  
Ina Andreasen ◽  
Bente Nielsen
Keyword(s):  
Comparative Study ◽  
Wastewater Treatment Plants ◽  
Membrane Filter ◽  
Filter Press ◽  
Full Scale ◽  
Sludge Dewatering ◽  
Dewatered Sludge ◽  
Solids Content ◽  
Very High ◽  
P Removal

A comparative study of 4 different types of full-scale sludge dewatering units was performed in 1990 by I. Krüger AS in co-operation with the equipment suppliers. The purpose of the study was to examine the capability of the dewatering equipment on the “new” sludge types from wastewater treatment plants with N and P removal. The achieved results have formed the basis of a financial evaluation comprising construction and operating costs. The objective of the evaluation is to compare the total costs involved in sludge dewatering and disposal. The relatively cheap types of dewatering units (belt filter press, solid bowl centrifuge) produce dewatered sludge with a lower dry solids content than the more expensive equipment (press centrifuge, membrane filter press). The latter types should consequently primarily be applied where the dewatered sludge has to meet special requirements and in situations in which disposal costs are very high.

scholarly journals Full-scale performance of selected starch-based biodegradable polymers in sludge dewatering and recommendation for applications

2017 ◽  
Vol 77 (1) ◽  
pp. 7-16 ◽  
Author(s):  
Kuangxin Zhou ◽  
Johan Stüber ◽  
Rabea-Luisa Schubert ◽  
Christian Kabbe ◽  
Matthias Barjenbruch
Keyword(s):  
Biodegradable Polymers ◽  
Wastewater Treatment Plants ◽  
Pilot Scale ◽  
Full Scale ◽  
Municipal Sewage ◽  
Municipal Sewage Sludge ◽  
Operational Parameters ◽  
Sludge Dewatering ◽  
Dewatered Sludge ◽  
Green Polymers

Abstract Agricultural reuse of dewatered sludge is a valid route for sludge valorization for small and mid-size wastewater treatment plants (WWTPs) due to the direct utilization of nutrients. A more stringent of German fertilizer ordinance requires the degradation of 20% of the synthetic additives like polymeric substance within two years, which came into force on 1 January 2017. This study assessed the use of starch-based polymers for full-scale dewatering of municipal sewage sludge. The laboratory-scale and pilot-scale trials paved the way for full-scale trials at three WWTPs in Germany. The general feasibility of applying starch-based ‘green’ polymers in full-scale centrifugation was demonstrated. Depending on the sludge type and the process used, the substitution potential was up to 70%. Substitution of 20–30% of the polyacrylamide (PAM)-based polymer was shown to achieve similar total solids (TS) of the dewatered sludge. Optimization of operational parameters as well as machinery set up in WWTPs is recommended in order to improve the shear stability force of sludge flocs and to achieve higher substitution potential. This study suggests that starch-based biodegradable polymers have great potential as alternatives to synthetic polymers in sludge dewatering.

Improved Centrifuge Sludge Dewatering by Automatic Backdrive Torque Control

1990 ◽  
Vol 22 (12) ◽  
pp. 303-308
Author(s):  
B. A. Garelli ◽  
E. L. Kokat ◽  
B. J. Schwartz
Keyword(s):  
Control Systems ◽  
Ferric Chloride ◽  
Direct Current ◽  
Performance Optimization ◽  
Torque Control ◽  
Water Reclamation ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Regular Production ◽  
Solids Content

An investigation of different automatic torque control systems for performance optimization of solid bowl centrifuges was conducted at the Stickney Water Reclamation Plant of the Metropolitan Water Reclamation District of Greater Chicago (District). Two automatic hydraulic backdrives and a direct current automatic torque controlled backdrive were tested on centrifuges used for dewatering digested sludge conditioned with a polymer and a combination of polymer and ferric chloride. The centrifuge unit of an advanced design coupled with the direct current automatic torque controlled backdrive produced a cake having a solids content of 30% and a solids capture of 97%. The regular production unit produced a cake having a solids content of 15% and a solids capture of 85%.

Full-scale application of anaerobic digestion process with partial ozonation of digested sludge

2005 ◽  
Vol 52 (1-2) ◽  
pp. 245-252 ◽  
Author(s):  
H. Yasui ◽  
K. Komatsu ◽  
R. Goel ◽  
Y. Y. Li ◽  
T. Noike
Keyword(s):  
Anaerobic Digestion ◽  
Full Scale ◽  
Digested Sludge ◽  
Anaerobic Digestion Process ◽  
Digestion Process ◽  
New Process ◽  
Sludge Cake ◽  
Dewatered Sludge ◽  
Solid Liquid ◽  
Solid Liquid Separation

For improving sludge digestion and biogas recovery, a new anaerobic digestion process combined with ozonation was tested at a full-scale unit for 2 years and its performance was compared with a simultaneously operated conventional anaerobic digestion process. The new process requires two essential modifications, which includes ozonation for enhancing the biological degradability of sludge organics and concentrating of solids in the digester through a solid/liquid separation for extension of SRT. These modifications resulted in high VSS degradation efficiency of ca. 88%, as much as 1.3 times of methane production and more than 70% reduction in dewatered sludge cake production. Owing to accumulation of inorganic solids in the digested sludge, water content of the dewatered sludge cake also reduced from 80% to 68%. An energy analysis suggested that no supplemental fuel was necessary for the subsequent incineration of the cake from the new process scheme. The process is suitable to apply to a low-loaded anaerobic digestion tank, where power production is used.

Full-scale application of the SHARON process for treatment of rejection water of digested sludge dewatering

2001 ◽  
Vol 43 (11) ◽  
pp. 127-134 ◽  
Author(s):  
J. W. Mulder ◽  
M. C. M. van Loosdrecht ◽  
C. Hellinga ◽  
R. van Kempen
Keyword(s):  
Operating Temperature ◽  
Ph Control ◽  
Full Scale ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Highly Active ◽  
N Removal ◽  
Conversion Rates ◽  
First Results ◽  
Sharon Process

At the Rotterdam Dokhaven WWTP the first full-scale application of the SHARON process has been constructed. In the SHARON process, rejection water from dewatering of digested sludge is treated for N-removal. It concerns a highly active process operating without sludge retention. The single tank reactor is intermittently aerated. Due to differences in growth rate nitrite oxidisers are washed out of the system while ammonia oxidisers can be maintained, resulting in N-removal over nitrite. The SHARON process has been selected after comparison with several other techniques. The feed of the SHARON tank is concentrated, with ammonia concentrations over 1 g N/l. The first results show that conversion rates of 90% are quite possible with N-removal mainly via the nitrite route. The process was shown to be stable. Due to the high inlet concentrations pH control is of great importance, preventing process inhibitions. The acidifying effect of nitrification can be compensated completely by CO2 stripping during aeration and by denitrification. Heat production by biological conversions appeared to be significant, due to the high inlet concentrations, and contributes to the optimal operating temperature of 30-40°C.

Recent Advances in Mechanical Dewatering of Digested Sludge

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1441-1446
Author(s):  
Earl W. Knight
Keyword(s):  
Filter Press ◽  
Screw Press ◽  
Pilot Test ◽  
Test Program ◽  
Sludge Dewatering ◽  
Digested Sludge ◽  
Bowl Centrifuge ◽  
Different Types ◽  
Critical Unit ◽  
Solids Content

The present sludge processing operations at the District consist of heated anaerobic digestion, dewatering by centrifugation, and air drying. A critical unit operation in the overall sludge processing train is the mechanical dewatering step. Typically, sludge dewatering by the District's existing centrifuges produces a cake having a solids content of 15%. Four different types of mechanical sludge dewatering machines were evaluated in a pilot test program to determine if these machines could produce cakes having greater solids contents than that produced from the existing centrifuges. The machines tested were two modified versions of the conventional horizontal solid bowl centrifuge design, a screw press, and a diaphragm filter press. The two modified centrifuges produced cakes having average solids contents of 20% and 29.4%, respectively; the screw press produced a cake having an average solids content of 17.5%, and the diaphragm filter press produced a cake having an average solids content of 29.4%. Based on the pilot test program, a test evaluation program was conducted using full-scale centrifuge machines of the modified designs. The preliminary results of this test program confirmed that centrifuges can produce a cake with a solids content approximately equal to or greater than 30%.

Improved Sludge Dewatering by Dual Polymer Conditioning

1993 ◽  
Vol 28 (1) ◽  
pp. 53-57 ◽  
Author(s):  
P. R. Senthilnathan ◽  
Roger G. Sigler
Keyword(s):  
Molecular Weight ◽  
Pharmaceutical Industry ◽  
Activated Sludge ◽  
High Molecular Weight ◽  
Full Scale ◽  
Screening Methods ◽  
Low Molecular Weight ◽  
Sludge Dewatering ◽  
Sludge Cake ◽  
Solids Content

Dual polymer conditioning enhanced the dewatering characteristics of aerobically digested activated sludge from a pharmaceutical industry. The solids content of the dewatered sludge cake, from a belt filter, increased from 8-11% range to 11-14% range due to dual polymer conditioning. In addition, dual polymer conditioning improved the compressibility of the sludge cake, reduced blinding of the belt filter media, and enhanced solids capture by the belt filter. Initially, bench scale studies were conducted to screen suitable polymers for conditioning. From these studies, two polymers, namely, Calgon Catfloc 8964 (a low molecular weight, high cationic charge) and Calgon WT2476I (a high molecular weight, high cationic charge) were chosen for full scale experiments. This paper reports the details of the polymer screening methods, dual polymer conditioning procedures, and the results of the full scale trials.

A Critical Look into the Deviation of Full Scale Performance from Design Expectations

1989 ◽  
Vol 21 (10-11) ◽  
pp. 1389-1402 ◽  
Author(s):  
R. Zaloum
Keyword(s):  
Expert Systems ◽  
Waste Treatment ◽  
Full Scale ◽  
Operating Conditions ◽  
Organic Load ◽  
Computer Assisted ◽  
Uniform Load ◽  
Effluent Quality ◽  
Simulation Techniques ◽  
Steady Level

Deviations from design expectations appear to stem from views which assume that a unique response should result from a given set of operating conditions. The results of this study showed that two systems operating at equal organic loads or F/M ratios and at the same SRT do not necessarily give equal responses. This deviation was linked to the manner in which the HRT and influent COD are manipulated to obtain a constant or uniform load, and to subtle interactions between influent COD, HRT and SRT on the biomass and effluent responses. Increases of up to 200% in influent COD from one steady level to the next did not significantly influence the effluent VSS concentration while an effect on filtered COD was observed for increases as low as 20%. Effluent TKN and filtered COD correlated strongly with the operating MLVSS while phosphorus residual depended on the operating SRT and the organic load removed. These results point to the inadequacy of traditional models to predict effluent quality and point to the need to consider these effects when developing simulation techniques or computer assisted expert systems for the control of waste treatment plants.

Automatic buffer capacity based sensor for effluent quality monitoring

1996 ◽  
Vol 33 (1) ◽  
pp. 81-87
Author(s):  
L. Van Vooren ◽  
P. Willems ◽  
J. P. Ottoy ◽  
G. C. Vansteenkiste ◽  
W. Verstraete
Keyword(s):  
Wastewater Treatment ◽  
Buffer Capacity ◽  
Wastewater Treatment Plants ◽  
Data Interpretation ◽  
Full Scale ◽  
Quality Monitoring ◽  
Effluent Quality ◽  
Capacity Curves ◽  
On Line

The use of an automatic on-line titration unit for monitoring the effluent quality of wastewater plants is presented. Buffer capacity curves of different effluent types were studied and validation results are presented for both domestic and industrial full-scale wastewater treatment plants. Ammonium and ortho-phosphate monitoring of the effluent were established by using a simple titration device, connected to a data-interpretation unit. The use of this sensor as the activator of an effluent quality proportional sampler is discussed.

Control Strategies for a Highly Loaded Biological Ammonia Elimination Process

1993 ◽  
Vol 28 (11-12) ◽  
pp. 531-538 ◽  
Author(s):  
B. Teichgräber
Keyword(s):  
Closed Loop ◽  
Control Strategies ◽  
Level Control ◽  
Sludge Dewatering ◽  
Loop Control ◽  
Reject Water ◽  
Line Measurement ◽  
Control Pattern ◽  
On Line ◽  
Treatment Facilities

A nitrification/denitrification process was applied to reject water treatment from sludge dewatering at Bottrop central sludge treatment facilities of the Emschergenossenschaft. On-line monitoring of influent and effluent turbidity, closed loop control of DO and pH, and on-line monitoring of nitrogen compounds were combined to a three level control pattern. Though on-line measurement of substrate and product showed substantial response time it could be used to operate nitrification/denitrification within process boundaries.

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