Reduction of excess sludge production in sequencing batch reactor through incorporation of chlorine dioxide oxidation

2011 ◽  
Author(s):  
Guanghua Wang ◽  
Jun Sui ◽  
Huishan Shen ◽  
Shukun Liang ◽  
Xiangming He ◽  
...  
Keyword(s):  
Chlorine Dioxide ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Excess Sludge ◽  
Sludge Production

Reduction of the sludge production in a sequencing batch reactor by addition of chlorine dioxide: Influence on the process performance

2012 ◽  
Vol 209 ◽  
pp. 318-324 ◽  
Author(s):  
E. Zuriaga-Agustí ◽  
G. Garrido-Mauri ◽  
J.A. Mendoza-Roca ◽  
A. Bes-Piá ◽  
J.L. Alonso-Molina
Keyword(s):  
Chlorine Dioxide ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Process Performance ◽  
Sludge Production

scholarly journals Modelling of sequencing batch reactor operating at various aeration modes

2019 ◽  
Vol 252 ◽  
pp. 05013
Author(s):  
Grzegorz Łagód ◽  
Adam Piotrowicz ◽  
Piotr Gleń ◽  
Jakub Drewnowski ◽  
Fabrizio Sabba
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Significant Degree ◽  
Excess Sludge ◽  
Effluent Quality ◽  
First Case ◽  
Treated Sewage ◽  
Do Concentration ◽  
Reactor Operating ◽  
Operation Cycle

The presented study involved designing a computer model of a sequencing batch reactor (SBR) at laboratory scale. The data pertaining to the technical aspects of the bioreactor and quality indicators of wastewater constituted the input for the employed simulation tool, i.e. GPS-X software package. The results of a simulation involving a 12-hour operation cycle are presented in this work; each cycle included 6 phases: filling, mixing, aeration, settling, decantation and idling (wasting of excess sludge). The simulations were carried out using two different modes of aeration. Concentration of dissolved oxygen (DO) was maintained at constant level of 2 mgO2/L using the PID controller in the first case. On the other hand, variation of DO concentration was employed in the aeration stage of the second variant, which was achieved using appropriately elaborated set point of oxygen concentration, considering the specific intervals in oxygen supply. The changes observed in DO concentration varied from 0.5 to 2.5 mgO2/L. This research proved that the second variant, involving variation of DO concentration, was characterised by reduced levels of pollution indicators in treated sewage, as well as lower consumption of electricity, both of which contributed towards improving the effluent quality and resulted in significant degree of dephosphatation.

Effect of hot acid hydrolysis and hot chlorine dioxide stage on bleaching effluent biodegradability

2007 ◽  
Vol 55 (6) ◽  
pp. 39-46 ◽  
Author(s):  
C.M. Gomes ◽  
J.L. Colodette ◽  
N.R.N. Delantonio ◽  
A.H. Mounteer ◽  
C.M. Silva
Keyword(s):  
Acid Hydrolysis ◽  
Chlorine Dioxide ◽  
Biological Treatment ◽  
Kraft Pulp ◽  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Organic Load ◽  
Activated Sludge System ◽  
Eucalyptus Kraft Pulp ◽  
Complete Sequences

The hot acid hydrolysis followed by chlorine dioxide (A/D*) and hot chlorine dioxide (D*) technologies have proven very useful for bleaching of eucalyptus kraft pulp. Although the characteristics and biodegradability of effluents from conventional chlorine dioxide bleaching are well known, such information is not yet available for effluents derived from hot acid hydrolysis and hot chorine dioxide bleaching. This study discusses the characteristics and biodegradability of such effluents. Combined whole effluents from the complete sequences DEpD, D*EpD, A/D*EpD and ADEpD, and from the pre-bleaching sequences DEp, D*Ep, A/D*Ep and ADEp were characterized by quantifying their colour, AOX and organic load (BOD, COD, TOC). These effluents were also evaluated for their treatability by simulation of an activated sludge system. It was concluded that treatment in the laboratory sequencing batch reactor was efficient for removal of COD, BOD and TOC of all effluents. However, colour increased after biological treatment, with the greatest increase found for the effluent produced using the AD technology. Biological treatment was less efficient at removing AOX of effluents from the sequences with D*, A/D* and AD as the first stages, when compared to the reference D stage; there was evidence of the lower treatability of these organochlorine compounds from these sequences.

Full scale experiences with small sequencing batch reactor plants in Bavaria

2000 ◽  
Vol 41 (1) ◽  
pp. 89-96 ◽  
Author(s):  
B. Helmreich ◽  
D. Schreff ◽  
P.A. Wilderer
Keyword(s):  
Sequencing Batch Reactor ◽  
Batch Reactor ◽  
Quantitative Information ◽  
Suspended Solid ◽  
Solid Loading ◽  
Excess Sludge ◽  
Difficult Situation ◽  
Actual Performance ◽  
System Failures ◽  
Design Engineers

The number of sequencing batch reactor (SBR) plants in operation world-wide has been growing, but scientific process evaluation has not been adequately executed, and very little quantitative information is available on the actual performance of those systems. Trial and error approaches are prevailing. Consequently design engineers and water authorities are left in a rather difficult situation. To get an overview of the performance of SBR plants in operation in the State of Bavaria, Germany, the performance of the existing municipal SBRs has been investigated. The plants investigated comply with the discharge regulations, but in some cases only with the aid of secondary polishing ponds. Most of the system failures observed were caused by inadequate actions of the operators. Energy consumption was in the range of 56 kWh/(PE, a), and excess sludge production varied between 0.25 and 0.81 kg/kgCOD depending on the influent suspended solid loading.

Sludge reduction by direct addition of chlorine dioxide into a sequencing batch reactor under operational mode of repeatedly alternating aeration/non-aeration

2015 ◽  
Vol 72 (9) ◽  
pp. 1534-1542 ◽  
Author(s):  
Hong Peng ◽  
Weiyi Liu ◽  
Yuanmei Li ◽  
Hong Xiao
Keyword(s):  
Chlorine Dioxide ◽  
Suspended Solids ◽  
Sequencing Batch Reactor ◽  
Municipal Wastewater ◽  
Batch Reactor ◽  
Volume Index ◽  
Sludge Reduction ◽  
Operational Mode ◽  
Municipal Wastewater Treatment ◽  
Direct Addition

The effect of direct addition of chlorine dioxide (ClO2) into a repeatedly alternating aeration/non-aeration sequencing batch reactor (SBR) on its sludge reduction and process performance was investigated. The experimental results showed that the sludge reduction efficiency was 32.9% and the observed growth yield (Yobs) of SBR was 0.11 kg VSS (volatile suspended solids) /kg COD (chemical oxygen demand) for 80 days’ operation at the optimum ClO2 dosage of 2.0 mg/g TSS (total suspended solids). It was speculated that cell lysis and cryptic growth, uncoupled metabolism and endogenous metabolism were jointly responsible for the sludge reduction in this study. COD, NH3-N, total nitrogen (TN) and total phosphorus (TP) in the effluent increased on average 29.47, 4.44, 1.97 and 0.05 mg/L, respectively. However, the effluent quality still satisfied the first-class B discharge standards for municipal wastewater treatment plants in China. In that case, the sludge maintained fine viability with the specific oxygen uptake rate (SOUR) being 14.47 mg O2/(g VSS·h) and demonstrated good settleability with the sludge volume index (SVI) being 116 mL/g. The extra cost of sludge reduction at the optimum ClO2 dosage was estimated to be 2.24 CNY (or 0.36 dollar)/kg dry sludge.

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