Kinetics of chrome-tannery effluent treatment by the activated-sludge system

1999 ◽  
Vol 35 (3-4) ◽  
pp. 255-265 ◽  
Author(s):  
Babu Ram ◽  
Pramod K Bajpai ◽  
Harjinder K Parwana
Keyword(s):  
Activated Sludge ◽  
Effluent Treatment ◽  
Tannery Effluent ◽  
Activated Sludge System ◽  
Kinetics Of

scholarly journals Biofloc production in activated sludge system treating shrimp farming effluent

2018 ◽  
Vol 23 (6) ◽  
pp. 1143-1152 ◽  
Author(s):  
Sandra Tedde Santaella ◽  
Maria do Socorro Vale ◽  
Clara Cabral Almeida ◽  
Willame de Araújo Cavalcante ◽  
Alberto Jorge Pinto Nunes ◽  
...  
Keyword(s):  
Activated Sludge ◽  
Oxygen Demand ◽  
Shrimp Farming ◽  
Effluent Treatment ◽  
Nitrogen Compounds ◽  
Suitable Alternative ◽  
Activated Sludge System ◽  
Feed Cost ◽  
Shrimp Feed ◽  
Farming Industry

ABSTRACT The release of wastewater and the shrimp feed cost are the main challenges faced by the shrimp farming industry. An alternative solution to both problems is biofloc production in a unit external to the farm, in an activated sludge system for effluent treatment. The treatment system’s influent was composed of the shrimp farm wastewater supplemented with urea and sugarcane molasses. The results show that the average removal of chemical oxygen demand was 71% and the average biofloc production in the reactor was approximately 1.5g.L-1. Adding molasses to the influent contributed to the increase in the quantity and diversity of existing microorganisms that are beneficial to cultured shrimp. The mass balance of nitrogen compounds confirmed that nitrification occurred in the system. Therefore, the use of the activated sludge system is a viable and environmentally suitable alternative to produce bioflocs and shrimp farming effluent treatment.

Valuation of OSA process and folic acid addition as excess sludge minimization alternatives applied in the activated sludge process

2015 ◽  
Vol 73 (4) ◽  
pp. 734-739 ◽  
Author(s):  
C. L. Martins ◽  
V. F. Velho ◽  
S. R. A. Ramos ◽  
A. S. C. D. Pires ◽  
E. C. N. F. A. Duarte ◽  
...  
Keyword(s):  
Folic Acid ◽  
Activated Sludge ◽  
Effluent Treatment ◽  
Activated Sludge Process ◽  
Excess Sludge ◽  
Control Phase ◽  
Activated Sludge System ◽  
Acid Addition ◽  
Sludge Minimization ◽  
Sludge Production

The aim of this study was to investigate the ability of the oxic-settling-anaerobic (OSA)-process and the folic acid addition applied in the activated sludge process to reduce the excess sludge production. The study was monitored during two distinct periods: activated sludge system with OSA-process, and activated sludge system with folic acid addition. The observed sludge yields (Yobs) were 0.30 and 0.08 kgTSS kg–1 chemical oxygen demand (COD), control phase and OSA-process (period 1); 0.33 and 0.18 kgTSS kg–1 COD, control phase and folic acid addition (period 2). The Yobs decreased by 73 and 45% in phases with the OSA-process and folic acid addition, respectively, compared with the control phases. The sludge minimization alternatives result in a decrease in excess sludge production, without negatively affecting the performance of the effluent treatment.

Nitrification Kinetics in Activated Sludge with Both Suspended and Attached Biomasses

1994 ◽  
Vol 29 (7) ◽  
pp. 181-184 ◽  
Author(s):  
P. Chudoba ◽  
M. Pannier
Keyword(s):  
Activated Sludge ◽  
Aeration Tank ◽  
Continuous Systems ◽  
Biomass Growth ◽  
Batch Tests ◽  
Activated Sludge System ◽  
Nitrification Kinetics ◽  
Kinetic Tests ◽  
Suspended Biomass ◽  
Kinetics Of

A series of nitrification kinetic tests was carried out with both suspended and fixed biomasses originated from a combined activated sludge system with a plastic support for biomass growth introduced into the aeration tank (Experimental combined unit - ECU). The results of these batch tests were compared with kinetics calculated from continuously run pilot plant. It was concluded that nitrification kinetics of both suspended and attached biomasses were similar and, consequently, it was assumed that the percentage of autotrophs is the same in both biomasses. The kinetics determined in both batch and continuous systems were comparable. Kinetic constants measured for suspended biomass of the ECU were higher than those reported by the literature, which was attributed to an overaeration of the ECU and an energetic mixing

Performance and biomass kinetics of activated sludge system treating dairy wastewater

2012 ◽  
Vol 65 (4) ◽  
pp. 609-615 ◽  
Author(s):  
FRANKLIN MAGDALINE ELJEEVA EMERALD ◽  
DATTATREYA S A PRASAD ◽  
MENON REKHA RAVINDRA ◽  
HEARTWIN A PUSHPADASS
Keyword(s):  
Activated Sludge ◽  
Dairy Wastewater ◽  
Activated Sludge System ◽  
Kinetics Of
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