scholarly journals Study of COD Removal Rate on a Sequencing Batch Reactor (SBR) Treating Tapioca Wastewater

2019 ◽  
Vol 38 (3) ◽  
pp. 243
Author(s):  
Happy Mulyani ◽  
Gregorius Prima Indra Budianto ◽  
Margono Margono ◽  
Mujtahid Kaavessina
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
Cod Removal ◽  
Operation Condition ◽  
Effluent Quality ◽  
Aeration Time ◽  
Standard Quality ◽  
Cod Removal Rate

Industrial wastewater treatment using Sequencing Batch Reactor (SBR) can improve effluent quality at lower cost than that obtained by other biological treatment methods. Further optimization is still required to enhance effluent quality until it meets standard quality and to reduce the operating cost of treatment of high strength organic wastewater. The purpose of this research was to determine the effect of pretreatment (pH adjustment and prechlorination) and aeration time on effluent quality and COD removal rate in tapioca wastewater treatment using SBR. Pretreatment was done by (1) adjustment of tapioca wastewater pH to control (4.92), 7, and 8, and (2) tapioca wastewater prechlorination at pH 8 during hour using calcium hypochlorite in variation dosages 0, 2, 4, 6 mg/L Cl2, SBR operation was conducted according to following steps: (1) Filling of pre-treated wastewater into a bioreactor during 1 hour, and (2) aeration of the mixture of tapioca wastewater and activated sludge during 8 hours. Effluent sample was collected at every 2-hours aeration for COD analysis. COD removal rate mathematical formula was got by first deriving the best fit function between aeration time and COD. Optimum aeration time resulting in no COD removal rate. The value of COD effluent and its removal rate in optimum aeration time was used to determine the recommended of operation condition of pretreatment. Research result shows that chosen pH operation condition is pH 8. Prechorination can make effluent quality which meets standard quality and highest COD removal rate. The chosen Cl2 dosage is 6 mg/L.

Aerobic granulation in a sequencing batch reactor (SBR) for industrial wastewater treatment

2005 ◽  
Vol 52 (10-11) ◽  
pp. 335-343 ◽  
Author(s):  
M. Inizan ◽  
A. Freval ◽  
J. Cigana ◽  
J. Meinhold
Keyword(s):  
Industrial Wastewater ◽  
Removal Rate ◽  
Batch Reactor ◽  
Experimental Tests ◽  
Cod Removal ◽  
High Concentration ◽  
Granule Formation ◽  
Aerobic Granulation ◽  
Cod Removal Rate ◽  
Set Up

Aerobic granulation seems to be an a attractive process for COD removal from industrial wastewater, characterised by a high content of soluble organic compounds. In order to evaluate the practical aspects of the process, comparative experimental tests are performed on synthetic and on industrial wastewater, originating from pharmaceutical industry. Two pilot plants are operated as sequencing batch bubble columns. Focus was put on the feasibility of the process for high COD removal and on its operational procedure. For both wastewaters, a rapid formation of aerobic granules is observed along with a high COD removal rate. Granule characteristics are quite similar with respect to the two types of wastewater. It seems that filamentous bacteria are part of the granule structure and that phosphorus precipitation can play an important role in granule formation. For both wastewaters similar removal performances for dissolved biodegradable COD are observed (> 95%). However, a relatively high concentration of suspended solids in the outlet deteriorates the performance with regard to total COD removal. Biomass detachment seems to play a non-negligible role in the current set-up. After a stable operational phase the variation of the pharmaceutical wastewater caused a destabilisation and loss of the granules, despite the control for balanced nutrient supply. The first results with real industrial wastewater demonstrate the feasibility of this innovative process. However, special attention has to be paid to the critical aspects such as granule stability as well as the economic competitiveness, which both will need further investigation and evaluation.

scholarly journals Bioaugmentation with Mixed Hydrogen-Producing Acetogen Cultures Enhances Methane Production in Molasses Wastewater Treatment

Archaea ◽  
2018 ◽  
Vol 2018 ◽  
pp. 1-10 ◽  
Author(s):  
Shuo Wang ◽  
Jianzheng Li ◽  
Guochen Zheng ◽  
Guocheng Du ◽  
Ji Li
Keyword(s):  
Wastewater Treatment ◽  
Removal Rate ◽  
Oxygen Demand ◽  
Cod Removal ◽  
Anaerobic Wastewater Treatment ◽  
Rate Limiting Step ◽  
Limiting Step ◽  
Molasses Wastewater ◽  
Cod Removal Rate ◽  
Rate Limiting

Hydrogen-producing acetogens (HPA) have a transitional role in anaerobic wastewater treatment. Thus, bioaugmentation with HPA cultures can enhance the chemical oxygen demand (COD) removal efficiency and CH4yield of anaerobic wastewater treatment. Cultures with high degradation capacities for propionic acid and butyric acid were obtained through continuous subculture in enrichment medium and were designated as Z08 and Z12. Bioaugmentation with Z08 and Z12 increased CH4production by glucose removal to 1.58. Bioaugmentation with Z08 and Z12 increased the COD removal rate in molasses wastewater from 71.60% to 85.84%. The specific H2and CH4yields from COD removal increased by factors of 1.54 and 1.63, respectively. Results show that bioaugmentation with HPA-dominated cultures can improve CH4production from COD removal. Furthermore, hydrogen-producing acetogenesis was identified as the rate-limiting step in anaerobic wastewater treatment.

Improvement and prediction of OSA system performance in sludge reduction through integration with thermal and mechanical treatment

2016 ◽  
Vol 74 (9) ◽  
pp. 2087-2096 ◽  
Author(s):  
Sara Nazif ◽  
Naser Mehrdadi ◽  
Sajad Zare ◽  
Sarvenaz Mosavari
Keyword(s):  
Thermal Treatment ◽  
Mechanical Treatment ◽  
Removal Rate ◽  
Batch Reactor ◽  
Cod Removal ◽  
Aeration Tank ◽  
Sludge Reduction ◽  
Mechanical Mixing ◽  
Effluent Quality ◽  
Sludge Production

The oxic–settling–anoxic (OSA) process is one of the sludge production reduction methods in the activated sludge process. In this method, sludge is stored in an anaerobic tank within the sludge return line before entrance into an aeration tank. Due to this method's flexibility in application to operating treatment plants and not being energy-consuming, its application is developing. In this research, the improvement of the OSA process is investigated via thermal and mechanical treatment in a sequencing batch reactor (SBR). A pilot-scale reactor and domestic wastewater are used. Sludge was subjected to high temperature in an anaerobic tank using a heat transformer and it was subjected to mechanical shear through mechanical mixing in the anaerobic tank. Different temperatures and voltages were tested. The OSA process reduced sludge production by 24% while the chemical oxygen demand (COD) removal rate decreased from 90% to 86%. Thermal treatment combined with the OSA process caused a maximum of 46% sludge production reduction. However temperatures above 90 °C are not recommended due to a high level of decrease in COD removal. Mechanical mixing in combination with the OSA process led to 34% sludge production reduction. The effluent quality is not affected by the OSA process itself but is slightly reduced by thermal treatment and mechanical mixing. Therefore, for reaching the maximum sludge reduction in OSA plus thermal and mechanical treatment it would be necessary to evaluate the effect of different sets of parameters on effluent quality beside the sludge reduction. For this purpose multi-layer perceptron artificial neural network models are developed to predict the effluent total suspended solids and COD removal efficiency as well as sludge production rate. The models perform well and would be useful tools in determining the optimal set of system operation parameters.

Research on Treatment of Schoolyard Domestic Sewage with Accelerator for Biological Reaction

2011 ◽  
Vol 396-398 ◽  
pp. 2048-2051
Author(s):  
Li Hong Lan ◽  
Ping Lan ◽  
Tao Xie ◽  
An Ping Liao
Keyword(s):  
Wastewater Treatment ◽  
Hot Spots ◽  
Oxygen Transfer ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Domestic Sewage ◽  
Contaminated Water ◽  
Optimum Conditions ◽  
Aeration Time ◽  
Biological Reaction

Abstract. Sufficient dissolved oxygen (DO) is one of the important factors on the treatment of contaminated water by using aerobic microbes. So that oxygen transfer becomes one of the hot spots on the research and development of the wastewater treatment engineering. Oxygen transfering is intensified by the accelerator for biological reaction. In this paper, the schoolyard domestic sewage was processed by the method of sequencing batch reactor (SBR) activated sludge processing. Some important factors, e.g. the dosage of the accelerator for biological reaction, and the effect of the aeration time and intensity on the CODCr removal efficiency have been investigated, the optimum conditions have been chosen.

Expansion and Upgrading of Columbus, OH WWTPs to Advanced Wastewater Treatment

1992 ◽  
Vol 25 (4-5) ◽  
pp. 1-8 ◽  
Author(s):  
O. E. Albertson ◽  
R. F. Scott ◽  
H. D. Stensel ◽  
R. W. Okey
Keyword(s):  
Wastewater Treatment ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Transport Capacity ◽  
Effluent Quality ◽  
History Of ◽  
Advanced Wastewater Treatment ◽  
The City ◽  
Design Construction

In December 1985, the City of Columbus, OH initiated a $220 million program for upgrading capacity and treatment from secondary to advanced wastewater treatment (AWT). The two plants (4990 L/s and 2630 L/s) were required to be fully operational by July 1988. The existing plants had a history of bulking sludges and it was necessary that design/construction proceed concurrently with a laboratory 18-month sequencing batch reactor (SBR) study to evaluate bulking sludge control while producing the required effluent quality of CBOD5, TSS and NH4N of 8,16 and 1 mg/L, respectively. Completion was on schedule and full-scale results paralleled those produced by the SBR sludge. Average effluent concentrations from the larger plant for the 2.5 years of operation were 2 mg/L CBOD5, 5.5 mg/L TSS, 1.5 mg/L TKN, 0.13 mg/L NH4N and 1.1 mg/L TP. The problems resulting from unexpectedly high sludge yields and inadequate sludge transport capacity in the 61 mø clarifiers are discussed and resolutions presented.

Wet oxidation of an industrial high concentration pharmaceutical wastewater using hydrogen peroxide as an oxidant

2017 ◽  
Vol 20 (1) ◽  
Author(s):  
Xu Zeng ◽  
Jun Liu ◽  
Jianfu Zhao
Keyword(s):  
Hydrogen Peroxide ◽  
Removal Rate ◽  
Batch Reactor ◽  
Cod Removal ◽  
Evaluation Index ◽  
Wet Oxidation ◽  
Pharmaceutical Wastewater ◽  
High Concentration ◽  
Cod Removal Rate ◽  
Temperature Time

AbstractWet oxidation of an industrial pharmaceutical wastewater with high concentration organic pollutants using hydrogen peroxide as an oxidant was investigated. Experiments were performed in a batch reactor to discuss the effects of reaction temperature, time, the hydrogen peroxide amount and catalyst with COD removal rate as an evaluation index. Results show that the highest COD removal rate, 81.6 %, was achieved at 240 ºC for 60 min with the addition of H

Study on the Advanced Treatment of Dyeing Wastewater by Photocatalytic-H2O2

2014 ◽  
Vol 1048 ◽  
pp. 503-506
Author(s):  
Hui Xia Lan ◽  
Ping Ma ◽  
Jian Zhang ◽  
Hui Jie Li ◽  
Heng Zhang ◽  
...  
Keyword(s):  
Wastewater Treatment ◽  
Reaction Time ◽  
Removal Rate ◽  
Cod Removal ◽  
Advanced Treatment ◽  
Dyeing Wastewater ◽  
Biochemical Treatment ◽  
Emission Standard ◽  
Effect Of Ph ◽  
Cod Removal Rate

The composition of dyeing wastewater is complicated, after biochemical treatment, the effluent COD is still unable to meet the emission standard. To achieve discharge standard that often require advanced treatment after biochemical. This paper investigated effect of pH, reaction time, ZnO dosage, dosage of H2O2on the effect of dyeing wastewater treatment by photocatalytic-H2O2, the results showed that the reaction time of 15 min, pH of 4, dosage of ZnO was 4 g/L, 30% H2O2dosage was 1 ml/L, the COD removal rate was highest, can reach more than 55%.

Study on the Cultivation and Enrichment of Denitrifying Phosphorus Accumulating Organism in Different Patterns

2013 ◽  
Vol 830 ◽  
pp. 481-484
Author(s):  
De Ying Mu
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Sequencing Batch Reactor ◽  
Removal Rate ◽  
Batch Reactor ◽  
Treatment Plant ◽  
Oxygen Demand ◽  
Domestic Wastewater ◽  
Three Phase ◽  
Aerobic And Anaerobic

With synthetic domestic wastewater, denitrifying phosphorus accumulating organism was enriched and cultured by using activated sludge from a wastewater treatment plant in a set of sequencing batch reactor. Results showed that the system had a good effluent performance under the three-phase cultivation of anaerobic/aerobic, anaerobic/anoxic/aerobic and anaerobic/anoxic; the effluent concentration of chemical oxygen demand (COD) was below 25 mg/L, the average removal rate of phosphorus was 84.63%-88.19%.

scholarly journals Preparation and Application of Sewage Sludge Bio-char/zero Valent Iron (SSBC/ZVI) Composite for Improving the Biodegradability of a Real Chemical Synthesis-based Pharmaceutical Wastewater

2021 ◽  
Author(s):  
Gaoxiang Qi ◽  
Xiaobo Wang ◽  
Xuecheng Liu ◽  
Shen Yu
Keyword(s):  
Sewage Sludge ◽  
Chemical Synthesis ◽  
Removal Rate ◽  
Optimal Operation ◽  
Cod Removal ◽  
Pharmaceutical Wastewater ◽  
Operation Condition ◽  
Initial Ph ◽  
Cod Removal Rate ◽  
Pollutants Removal

Abstract A new kind of micro-electrolysis filler sewage sludge biochar/zero violent iron (SSBC/ZVI) composite was prepared for a real chemical synthesis based pharmaceutical wastewater (CSPW) pretreatment for improving the biodegradation index (BI). The optimal operation condition of micro-electrolysis system was obtained at HRT of 2 h, the initial pH of 3.0 and filler dosage of 100 g/L, with COD removal rate of 30.5%. Comparative analysis of raw and used SSBC/ZVI filler, GC-MS analysis of raw and treated pharmaceutical wastewater suggested that the pollutants removal was mainly attributed to the combination of reduction and oxidation, absorption of SSBC and flocculation effect of iron sludge. In addition, SSBC/ZVI exhibited relative high stability and excellent reusability for COD removal and BI improvement of real pharmaceutical wastewater. The results of this study provide new ideas of sewage sludge utilization for real wastewater pretreatment.

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