Magnetic water treatment in a wastewater treatment plant: Part I - sorption and magnetic particles

Full-scale and lab-scale research experiments were conducted to determine the phosphorous precipitation efficiency of iron hydroxide sludge from drinking water treatment. During full-scale investigations at a wastewater treatment plant, ferric sludge was added to the inflow of the primary settling tank in a first experimental phase and to the inflow of the aeration tank in a second phase. In the outflow of the mechanical stage and in the outflow of the biological stage, a reduction of the PO4-P concentrations could be observed. The concentration of COD, the SVI and the filament abundance were not changed significantly by adding the ferric sludge to the wastewater treatment plant. In lab tests, improved precipitation efficiency of the ferric sludge could be achieved by using anaerobic conditions and acid pulping. The research showed that the wastewater treatment process can benefit from the reuse of ferric sludge from drinking waterworks and that this also presents an inexpensive recycling option for these sludges.

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Nine-Year Study of the Occurrence of Culturable Viruses in Source Water for Two Drinking Water Treatment Plants and the Influent and Effluent of a Wastewater Treatment Plant in Milwaukee, Wisconsin (August 1994 through July 2003)

Applied and Environmental Microbiology ◽

10.1128/aem.71.2.1042-1050.2005 ◽

2005 ◽

Vol 71 (2) ◽

pp. 1042-1050 ◽

Cited By ~ 81

Author(s):

Gerald Sedmak ◽

David Bina ◽

Jeffrey MacDonald ◽

Lon Couillard

Keyword(s):

Drinking Water ◽

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Environmental Protection Agency ◽

Treatment Plant ◽

Drinking Water Treatment ◽

Source Water ◽

High Concentration ◽

Water Treatment Plants

ABSTRACT Reoviruses, enteroviruses, and adenoviruses were quantified by culture for various ambient waters in the Milwaukee area. From August 1994 through July 2003, the influent and effluent of a local wastewater treatment plant (WWTP) were tested monthly by a modified U.S. Environmental Protection Agency Information Collection Rule (ICR) organic flocculation cell culture procedure for the detection of culturable viruses. Modification of the ICR procedure included using Caco-2, RD, and HEp-2 cells in addition to BGM cells. Lake Michigan source water for two local drinking water treatment plants (DWTPs) was also tested monthly for culturable viruses by passing 200 liters of source water through a filter and culturing a concentrate representing 100 liters of source water. Reoviruses, enteroviruses, and adenoviruses were detected frequently (105 of 107 samples) and, at times, in high concentration in WWTP influent but were detected less frequently (32 of 107 samples) in plant effluent and at much lower concentrations. Eighteen of 204 samples (8.8%) of source waters for the two DWTPs were positive for virus and exclusively positive for reoviruses at relatively low titers. Both enteroviruses and reoviruses were detected in WWTP influent, most frequently during the second half of the year.

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Evaluation of the Impact of Return Flows on the Operation of a Wastewater Treatment Plant

Water Science & Technology ◽

10.2166/wst.1993.0059 ◽

1993 ◽

Vol 28 (1) ◽

pp. 273-281 ◽

Cited By ~ 2

Author(s):

P. Grulois ◽

A. Bousseau ◽

E. Blin ◽

C. Fayoux

Keyword(s):

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

Volume Index ◽

Sludge Treatment ◽

Treatment Line ◽

Water Treatment Process ◽

Return Flows ◽

The Impact

A systemic analysis of a wastewater treatment plant quickly reveals that return flows from the sludge treatment line affect the water treatment process. These return flows have a maximum value that is characteristic of a steady state of plant operation and the effects are detectable at several levels. It can, for example, influence the operation of the clarifier indicated by changes in the Sludge Volume Index, induce anaerobiosis in the separation works that stems from excess sludge production or decrease the dewatering of sludges. All these observations lead to the conclusion that the sludge treatment line should be designed that it could take up production overloads. It was also found that it is indispensible to monitor the water treatment line operation step by step in order to detect rapidly any drift of the operating parameters from their normal values.

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Impacts of Water Treatment Plant Residuals on Wastewater Treatment Plant Biosolids Programs – A Case Study

Proceedings of the Water Environment Federation ◽

10.2175/193864712811693614 ◽

2012 ◽

Vol 2012 (2) ◽

pp. 411-425

Author(s):

Brandt Miller ◽

Chamindra Dassanayake ◽

James E. Smith

Keyword(s):

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Treatment Plant ◽

Water Treatment Plant

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Two strategies for phosphorus removal from reject water of municipal wastewater treatment plant using alum sludge

Water Science & Technology ◽

10.2166/wst.2009.609 ◽

2009 ◽

Vol 60 (12) ◽

pp. 3181-3188 ◽

Cited By ~ 13

Author(s):

Y. Yang ◽

Y. Q. Zhao ◽

A. O. Babatunde ◽

P. Kearney

Keyword(s):

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Municipal Wastewater ◽

Treatment Plant ◽

Organic Polymer ◽

Municipal Wastewater Treatment ◽

Municipal Wastewater Treatment Plant ◽

Reject Water ◽

Alum Sludge

In view of the well recognized need of reject water treatment in MWWTP (municipal wastewater treatment plant), this paper outlines two strategies for P removal from reject water using alum sludge, which is produced as by-product in drinking water treatment plant when aluminium sulphate is used for flocculating raw waters. One strategy is the use of the alum sludge in liquid form for co-conditioning and dewatering with the anaerobically digested activated sludge in MWWTP. The other strategy involves the use of the dewatered alum sludge cakes in a fixed bed for P immobilization from the reject water that refers to the mixture of the supernatant of the sludge thickening process and the supernatant of the anaerobically digested sludge. Experimental trials have demonstrated that the alum sludge can efficiently reduce P level in reject water. The co-conditioning strategy could reduce P from 597–675 mg P/L to 0.14–3.20 mg P/L in the supernatant of the sewage sludge while the organic polymer dosage for the conditioning of the mixed sludges would also be significantly reduced. The second strategy of reject water filtration with alum sludge bed has shown a good performance of P reduction. The alum sludge has P-adsorption capacity of 31 mg-P/g-sludge, which was tested under filtration velocity of 1.0 m/h. The two strategies highlight the beneficial utilization of alum sludge in wastewater treatment process in MWWTP, thus converting the alum sludge as a useful material, rather than a waste for landfill.

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Reabilitation of a wastewater treatment plant – possible environment impact

Ovidius University Annals of Constanta - Series Civil Engineering ◽

10.1515/ouacsce-2017-0006 ◽

2017 ◽

Vol 19 (1) ◽

pp. 65-78

Author(s):

Mădălina Stănescu ◽

Constantin Buta ◽

Geanina Mihai

Keyword(s):

Waste Water ◽

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Waste Water Treatment ◽

Treatment Plant ◽

Water Treatment Plant ◽

Waste Water Treatment Plant ◽

Environment Impact ◽

Operational Phase

Abstract Romania, has declared, by the Governmental Decision nr.352/2005, all its territory as a sensitive area. This implies that, for all urban agglomerations larger than 10.000 population equivalent waste water treatment plants (WWTP) with nutrient removal must be built or upgraded. This paper presents the results regarding the possible environmental impacts expected from the project for construction of waste water treatment plant in the City of Vaslui, with main focus on surface water. This research study includes assessment methodology, project description regarding the rehabilitation and extension of the Vaslui waste water treatment plant, data related to water resources, impact assessment on water and appropriate mitigation measures. The assessment of the impacts has been performed for the construction and operational phase of the wastewater treatment plant. The construction phase was subdivided into several phases, while in the operational phase the impacts are analyzed following the line for treatment of the wastewater and effluent production, the line for sludge production and drying process, sludge disposal in safety conditions considering the provisions of 86/278/EEC Directive and the line for biogas utilization.

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Plant-wide (BSM2) evaluation of reject water treatment with a SHARON-Anammox process

Water Science & Technology ◽

10.2166/wst.2006.822 ◽

2006 ◽

Vol 54 (8) ◽

pp. 93-100 ◽

Cited By ~ 7

Author(s):

E.I.P. Volcke ◽

K.V. Gernaey ◽

D. Vrecko ◽

U. Jeppsson ◽

M.C.M. van Loosdrecht ◽

...

Keyword(s):

Wastewater Treatment ◽

Water Treatment ◽

Wastewater Treatment Plant ◽

Wastewater Treatment Plants ◽

Operating Cost ◽

Treatment Plant ◽

Cost Index ◽

Reject Water ◽

The Impact ◽

Anammox Process

In wastewater treatment plants (WWTPs) equipped with sludge digestion and dewatering systems, the reject water originating from these facilities contributes significantly to the nitrogen load of the activated sludge tanks, to which it is typically recycled. In this paper, the impact of reject water streams on the performance of a WWTP is assessed in a simulation study, using the Benchmark Simulation Model no. 2 (BSM2), that includes the processes describing sludge treatment and in this way allows for plant-wide evaluation. Comparison of performance of a WWTP without reject water with a WWTP where reject water is recycled to the primary clarifier, i.e. the BSM2 plant, shows that the ammonium load of the influent to the primary clarifier is 28% higher in the case of reject water recycling. This results in violation of the effluent total nitrogen limit. In order to relieve the main wastewater treatment plant, reject water treatment with a combined SHARON-Anammox process seems a promising option. The simulation results indicate that significant improvements of the effluent quality of the main wastewater treatment plant can be realized. An economic evaluation of the different scenarios is performed using an Operating Cost Index (OCI).

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