scholarly journals Simultaneous removal of nitrogen, phosphorus and organic substances from high strength of wastewater by sequencing batch reactor activated sludge process

1987 ◽  
Vol 10 (12) ◽  
pp. 741-748,727
Author(s):  
Mitsumasa OKADA ◽  
Akihiko MURAKAMI ◽  
Katsuhiro TERAZONO ◽  
Ryuichi SUDO
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
High Strength ◽  
Simultaneous Removal ◽  
Activated Sludge Process ◽  
Organic Substances ◽  
Nitrogen Phosphorus

Performance of Sequencing Batch Reactor Activated Sludge Processes for Simultaneous Removal of Nitrogen, Phosphorus and Bod as Applied to Small Community Sewage Treatment

1986 ◽  
Vol 18 (7-8) ◽  
pp. 363-370 ◽  
Author(s):  
M. Okada ◽  
R. Sudo
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Sewage Treatment ◽  
Phosphorus Release ◽  
Synthetic Wastewater ◽  
Simultaneous Removal ◽  
Small Community ◽  
Activated Sludge Processes ◽  
Nitrogen Phosphorus

Laboratory-scale sequencing batch reactor (SBR) activated sludge process was fed with synthetic wastewater to clarify the possibility of simultaneous removal of nitrogen, phosphorus, and organic substances by modifying operational schedule. Anoxic and/or anaerobic reactions in addition to aerobic reactions were introduced into a cycle of batch operation. Simultaneous removal of nitrogen, phosphorus and organic carbon was shown to be possible by the modified operation of SBR into which reactions without aeration (anoxic/anaerobic) were introduced during the fill period. Oxidized nitrogen remaining in the reactor at the end of the former cycle was removed by denitrification during the fill. Anaerobic conditions after the denitrification was completed enhanced phosphorus release from the sludge and the following luxury uptake during aeration removed phosphorus from water. Both extension and reduction of anoxic/anaerobic period in the beginning of a cycle damaged phosphorus removal and sludge settlability. Thus, an optimum length of period for these reactions must be chosen for successful operations. The best length of this period coincided with that of the fill within the range of this study.

Advanced Treatment of Domestic Wastewater Using Sequencing Batch Reactor Activated Sludge Process

1993 ◽  
Vol 28 (10) ◽  
pp. 267-274 ◽  
Author(s):  
M. Imura ◽  
E. Suzuki ◽  
T. Kitao ◽  
S. Iwai
Keyword(s):  
Activated Sludge ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Domestic Wastewater ◽  
Experimental Period ◽  
Small Scale ◽  
Experimental Plant ◽  
Activated Sludge Process ◽  
Nitrogen And Phosphorus ◽  
Experimental Apparatus

In order to apply a sequencing batch reactor activated sludge process to small scale treatment facilities, various experiments were conducted by manufacturing an experimental apparatus made of a factory-produced FRP cylinder transverse tank (Ø 2,500mm). Results of the verification test conducted for one year by leading the wastewater discharged from apartment houses into the experimental apparatus were as follows. Excellent performance was achieved without any addition of carbon source, irrespective of the organic compound concentration and the temperature of raw wastewater. Organic substances, nitrogen and phosphorus were removed simultaneously. Due to the automated operation format, stable performance was obtained with only periodic maintenance. Though water depth of the experimental plant was shallow, effective sedimentation of activated sludge was continued during the experimental period. Regarding the aerobic and anaerobic process, nitrification and denitrification occurred smoothly.

Simultaneous Removal of Phosphorus and Nitrogen by Sequencing Batch Reactor Activated Sludge Process

1985 ◽  
Vol 17 (11-12) ◽  
pp. 315-316
Author(s):  
Mitsumasa Okada ◽  
Ryuichi Sudo
Keyword(s):  
Organic Matter ◽  
Activated Sludge ◽  
Total Nitrogen ◽  
Total Phosphorus ◽  
Batch Reactor ◽  
Simultaneous Removal ◽  
Activated Sludge Process ◽  
Nitrogen Concentrations ◽  
Stage 1 ◽  
Activated Sludge Processes

Abstract–Phosphorus removal by biological means in continuous-flow aerobic/ anaerobic activated sludge processes is now in a stage of full-scale operations. The similar aerobic/anaerobic treatment is also found in biological processes for nitrogen removal by nitrification followed by denitrification. These processes are successfully applied not only to continuous-flow system but also to sequencing batch reactor (SBR) activated sludge processes, whereas little attempts have been reported on phosphorus removal in SBR activated sludge processes. It is most probable that both phosphorus and nitrogen in addition to organic matter can be removed by the SBR activated sludge processes if aerobic and anaerobic treatments were properly incorporated into a cycle of batch operation. Laboratory scale experiments on aerobic/anaerobic operations of the SBR processes were conducted aiming at simultaneous removal of phosphorus, nitrogen, and organic matter without any addition of chemicals. SBR of 5 1 in working volume was fed with synthetic wastewater in which TOC = 120-200 mg/l, BOD = 200-400 mg/l, total phosphorus = 6-12 mg/1 and total nitrogen = 36-60 mg/1. The following sequence of operations were conducted in a batch cycle; 1) mixing and inflow of wastewater, 2) aeration and mixing, 3) mixing, 4) aeration and mixing, 5) settling and 6) decanting. It was secured from continuous monitoring of dissolved oxygen concentration in the mixed liquor that both anaerobic (stages 1 and 3) and aerobic (stages 2 and 4) treatments were repeated twice in a cycle. In some operations, stages 3 and 4 were omitted for comparison, i.e. anaerobic and aerobic treatments were conducted only once per cycle. The volume of mixed liquor before the inflow of wastewater at the beginning of a cycle (low level) ranged from 33 % to 50 % of that during full volume stages from 2 to 5 (high level). In stage 6, the supernatant was discharged down to the low level and followed by the next cycle of operation. The length of time for a cycle of operation was β h or 9.5 h. Among various types of operations tried, the following sequence was the best in the quality of effluent; 1) 2 h for mixing and inflow, 2) 3 h for aeration and mixing, 3) 3 h for mixing, 4) 20 min for aeration and mixing, 5) 1 h for settling, and 6) 10 min for decanting in a cycle of 9.5 h if influent BOD, total phosphorus and total nitrogen concentrations were 400 mg/1, 12 mg/1 and 60 mg/1, respectively, and BOD loading was 0.68 kg/cu m/d. Total phosphorus and nitrogen concentrations in the effluent were 1.2 mg/1 and 8.0 mg/1, respectively. Similar results were obtained in operations where anaerobic and aerobic treatments were repeated twice in a cycle. In operations where effluent quality was satisfactory, release of phosphorus from the sludge was observed in stage 1. The reactor concentration of filterable total phosphorus (FTP) increased rapidly and its maximum value observed at the end of the stage was ca. 50 mg/1. Phosphorus uptake under aerobic condition (stage 2) decreased FTP to the level of effluent FTP. The luxury uptake of phosphorus by the sludge was noted, i.e. phosphorus content in the sludge ranged from 2.0 % to 4.0 %(w/w). The release of phosphorus from the sludge and subsequent luxury uptake were not significant during stages 3 to 4, hence, further removal of phosphorus was not remarkable. Nitrate nitrogen concentration increased during stage 2 by nitrification. Denitrification was noted both in stages 1 and 3. In stage 1, filterable total organic carbon (FTOC) increased by the inflow of wastewater. It should be, therefore, utilized for denitrification as hydrogen donor. FTOC decreased rapidly after the initiation of aeration in stage 2 and little FTOC remained after the latter half of stage 2. Intracellular organic substances of the sludge, therefore, were regarded to be utilized for denitrification without any addition of chemicals at stage 3. In the best operation, from 50% to 70% out of total nitrogen inflow was removed by denitrification. Effluent BOD was less than 10 mg/l. Although further investigations would be required to determine optimum scheduling in a cycle such as the combination of anaerobic and aerobic periods, the ratio between low and high levels in the reactor, the length of a cycle, and etc. for a given wastewater, the SBR activated sludge process would be a promising wastewater treatment process for simultaneous removal of phosphorus, nitrogen and organiC matter by a single reactor. In spite of complicated operational sequence, full scale automatic operations of SBR activated sludge process would be possible economically even in small-scale plants by using recently advanced microcomputer technology.

pH: Keyfactor in the Biological Phosphorus Removal Process

1994 ◽  
Vol 29 (7) ◽  
pp. 71-74 ◽  
Author(s):  
G. J. F. Smolders ◽  
M. C. M. van Loosdrecht ◽  
J. J. Heijnen
Keyword(s):  
Activated Sludge ◽  
Phosphorus Removal ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Glycogen Metabolism ◽  
Activated Sludge Process ◽  
Biological Phosphorus Removal ◽  
Anaerobic Conditions ◽  
Biochemical Mechanisms ◽  
Biological Phosphorus

Experiments have been performed, using a sequencing batch reactor, to examine the effect of pH on biological phosphorus removal in the activated sludge process. The results, which indicate that glycogen metabolism occurs during anaerobic conditions, are useful in elucidating the biochemical mechanisms involved in phosphorus-removal, and have potential implications for systems such as Phostrip.

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