Conversion of Existing Primary Clarifiers According to the EASC Process for Biological Phosphorus Removal

1990 ◽  
Vol 22 (7-8) ◽  
pp. 45-51 ◽  
Author(s):  
R. Schönberger
Keyword(s):  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Operation Mode ◽  
Phosphorus Uptake ◽  
Treatment Plant ◽  
Municipal Wastewater Treatment ◽  
Biological Phosphorus Removal ◽  
Northern Germany ◽  
Start Up ◽  
Biological Phosphorus

At the end of 1988 a 22,000 p.e. municipal wastewater treatment plant in Northern Germany was converted to the EASC-biological phosphorus removal process. By simple modifications of the flow scheme of the plant, one of two existing primary clarifiers was converted to an anaerobic basin, into which both sewage and recycle sludge are fed. The supernatant as well as the sludge withdrawn from the bottom are discharged into the aeration basin. This operation mode achieves very good phosphorus uptake in the aeration basin. Since start up in November '88, the uptake-capacity increased continually, since April '89 phosphorus is removed down to concentrations of less than 1 mg/l PO4-P in the aeration basin. Due to an inadequate design and size of the existing final clarifier, phosphorus bleedback occurs and reduces removal efficiency. This bleedback could be minimized by either intensifying denitrification or reducing sludge detention time in the final clarifier.

Biological phosphorus uptake in submerged biofilters with nitrogen removal

1994 ◽  
Vol 29 (10-11) ◽  
pp. 135-143 ◽  
Author(s):  
R. F. Gonçalves ◽  
L. Le Grand ◽  
F. Rogalla
Keyword(s):  
Phosphorus Removal ◽  
Phosphorus Uptake ◽  
Treatment Plant ◽  
Pilot Scale ◽  
Biological Phosphorus Removal ◽  
Low Phosphorus ◽  
Nitrification And Denitrification ◽  
Aerated Filter ◽  
Filter Bed ◽  
Biological Phosphorus

This paper introduces biological phosphorus removal (Bio-P) from wastewater on a submerged biofilter. Pilot scale research was carried out over a period of two years using a floating upflow aerated filter, originally designed for nitrification and denitrification of sewage. The factors which influence Bio-P on fixed film processes and the possible biofilter configurations which eliminate C, N and P are discussed. The procedures are applicable to all types of treatment plants using biofilters, both new and already in existence, making no distinction between the different processes available today, co-current and counter-current filters. Biological phosphorus removal can be associated to the different treatment levels required: organic matter removal; secondary nitrification secondary nitrification and denitrification. For the third option - complete nutrient removal, treatment is completed with a hydraulic retention time in the filter bed of under four hours. Because of the simultaneous filtration with effluent SS below 10 mg/l, low phosphorus residuals can be achieved by Bio-P alone. The modifications required for setting up this operating procedure on any treatment plant are presented.

Performance and economics of BNR Plants in the Chesapeake Bay Watershed, USA

2000 ◽  
Vol 41 (9) ◽  
pp. 21-28 ◽  
Author(s):  
C.W. Randall ◽  
E. Ubay Cokgor
Keyword(s):  
Chesapeake Bay ◽  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Treatment Plant ◽  
Chemical Precipitation ◽  
Municipal Wastewater Treatment ◽  
Biological Phosphorus Removal ◽  
Economy Of Scale ◽  
Chesapeake Bay Watershed

The performance and economics of four recently constructed or modified BNR municipal wastewater treatment plants located in the Chesapeake Bay Watershed, USA were evaluated, and compared to a treatment plant implementing chemical phosphorus removal and complete nitrification. Phosphorus removal has been very reliable to effluent concentrations below 0.5 mg/L without chemical addition or effluent filtration at BNR plants that have been operating for more than two years. Significant variation was observed in the wastewater characteristics, and this has affected biological phosphorus removal. Chemical precipitation effluent TP concentrations have averaged less than 0.1 mg/L.The small BNR plant was clearly the most costly to operate per 1000 m3/d of flow, which illustrates economy of scale. The chemical precipitation plant was generally more expensive to operate than the large BNR plants.

Enhanced biological phosphorus removal in a semifull-scale SBBR

2001 ◽  
Vol 43 (3) ◽  
pp. 167-174 ◽  
Author(s):  
P. Arnz ◽  
E. Arnold ◽  
P. A. Wilderer
Keyword(s):  
Phosphorus Removal ◽  
Operation Mode ◽  
Biofilm Reactor ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Aeration Time ◽  
Start Up ◽  
Main Carbon Source ◽  
In The Beginning ◽  
Biological Phosphorus

A 17 m3 Sequencing Batch Biofilm Reactor (SBBR) was operated for enhanced biological phosphorus removal and nitrification for a period of 384 days. Enhanced biological phosphorus removal (EBPR) activity was instantly induced after start-up of EBPR operation mode and low phosphate effluent values were reached from the first batch onward. Process stability with regard to nitrification and EBPR were very good although high nitrate loads from backwashing disturbed the P removal performance. Due to anoxic conditions in the beginning of the cycle, readily degradable COD was depleted by denitrification. Consequently, particulate matter was the main carbon source for phosphorus accumulating organisms. Anaerobic hydrolysis or fermentation was found to be the rate limiting process in the SBBR cycle. Simultaneous denitrification occurred in the first 30 minutes of aeration and - to a lesser extent - during the remaining aeration time, enhancing nitrogen removal and indirectly also phosphorus removal.

Experience with phosphorus removal and sludge handling and disposal in Flanders

2005 ◽  
Vol 52 (4) ◽  
pp. 19-25
Author(s):  
D. Bixio ◽  
I. Boonen ◽  
C. Thoeye ◽  
G. De Gueldre
Keyword(s):  
Phosphorus Removal ◽  
Municipal Wastewater ◽  
Wastewater Treatment Plants ◽  
Municipal Wastewater Treatment ◽  
Enhanced Biological Phosphorus Removal ◽  
Biological Phosphorus Removal ◽  
Key Factor ◽  
Municipal Wastewater Treatment Plants ◽  
The Impact ◽  
Biological Phosphorus

The way excess sludge must be disposed of is a key factor in the choice of the appropriate phosphorus removal technique at municipal wastewater treatment plants. In Europe the ongoing trend of tightening the sludge spreading rules called for a serious reduction of its agricultural utilisation and the expansion of the (co-)incineration disposal route, which led to a shift towards more sophisticated sludge handling techniques. This paper illustrates the impact of different sludge handling techniques on the performance of chemical and enhanced biological phosphorus removal at municipal WWTPs. The main conclusion is that although enhanced biological phosphorus removal is particularly sensitive to the problem of return liquors from sludge treatment processes indirect dewatering and anaerobic stabilisation cannot be discarded altogether when considering its implementation.

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