Settling of food-processing anaerobic sludge

2014 ◽  
Vol 49 (4) ◽  
pp. 319-327
Author(s):  
Arcadio Rodriguez-Prado ◽  
Leonard E. Ripley ◽  
Jorge H. Garcia-Orozco
Keyword(s):  
Wastewater Treatment ◽  
Food Processing ◽  
Settling Velocity ◽  
T Test ◽  
Anaerobic Sludge ◽  
Preliminary Results ◽  
Sedimentation Model ◽  
Sludge Settling ◽  
Food Processing Wastewater

This paper presents preliminary results of settling tests on anaerobic sludge from food-processing wastewater treatment, using 2, 4, and 8 L cylinders. A sedimentation model from the literature was applied to the sedimentation data. The specific settling velocities for the 2 and 4 L cylinders did not differ (t-test; P = 0.896), therefore the data were pooled. The specific settling velocity mean was nearly three times higher (P = 0.027) for the 8 L cylinder (21.03 × 10−4 ± 6.27 × 10−4 m/s) than the pooled smaller cylinder size (7.29 × 10−4 ± 2.32 × 10−4 m/s). Measurement challenges were encountered while working with the 8 L cylinder. Given that tests using a 1 L cylinder resulted in sludge compression, the results indicate that use of both 2 and 4 L cylinders is feasible for lab-scale measurement of sludge settling.

Anaerobic Wastewater Treatment in the Food Processing Industry: Two Case Studies

1986 ◽  
Vol 18 (12) ◽  
pp. 87-97 ◽  
Author(s):  
J. R. Campos ◽  
E. Foresti ◽  
R D. P. Camacho
Keyword(s):  
Wastewater Treatment ◽  
Food Processing ◽  
Upflow Anaerobic Sludge Blanket ◽  
Anaerobic Sludge ◽  
Organic Loading ◽  
Food Processing Industry ◽  
Processing Industry ◽  
Detention Time ◽  
Fruit Processing ◽  
Anaerobic Sludge Blanket

This article relates two experiments with wastewater treatment in the food processing industry. One of them refers to the use of an anaerobic filter (meat processing industry) and the other to the use of an upflow anaerobic sludge blanket reactor-UASB (vegetable and fruit processing industry). In the first case, the study describes the performance of an anaerobic filter which has been working for 6 years and provides COD removal efficiency (including primary treatment) equal or better than 80% with an organic loading of 1.4 kg of COD/m3 day. The reactor has a bed of broken stones with size of 0.75 m having a medium hydraulic detention time of 13 h. Discharges of accumulated sludge in a false bottom below the filter are made at intervals of 2 or 3 months.In the second case, the study describes the performance of an upflow anaerobic sludge blanket reactor (88 m3) during 255 days of operation including the adaptation phase or startup. This reactor receives wastewater from vegetable and fruit processing including tomato , corn, guava and peach. At the end of each operational phase studied, the COD removal efficiency was about 80%. In the last phase (7.5 h hydraulic detention time), the organic loading was 1.4 kg of COD/m3 day and the hydraulic loading was 3.2 m3/m3 day.

Potential of Food Processing Wastewater Treatment for Reuse

2019 ◽  
Vol 0 (0) ◽  
pp. 0-0
Author(s):  
Rifaat Abdel Wahaab ◽  
Enas Aboutaleb ◽  
Mahmoud Salem ◽  
Osama Amin
Keyword(s):  
Wastewater Treatment ◽  
Food Processing ◽  
Food Processing Wastewater

Anaerobic reactors for food processing wastewater treatment: established technology and new developments

1995 ◽  
Vol 32 (12) ◽  
pp. 157-163 ◽  
Author(s):  
L. C. H. V. Oliva ◽  
M. Zaiat ◽  
E. Foresti
Keyword(s):  
Food Processing ◽  
Rational Design ◽  
Scale Up ◽  
Design Parameters ◽  
Anaerobic Sludge ◽  
Anaerobic Reactors ◽  
Rational Design Parameters ◽  
Low Strength ◽  
Anaerobic Sludge Blanket ◽  
Food Processing Wastewater

This paper presents the features and the most important empirical design parameters of anaerobic filters (AF) and up-flow anaerobic sludge blanket (UASB) reactors which are the main anaerobic process units used for the treatment of low-strength food-processing wastewaters in Brazil. The technology associated with this type of reactors can be considered well established, since they are reliable operating at temperatures ranging from 15 to 30°C and at volumetric organic loading rates (OLR) lower than 5.0 kg COD.m−3.d−1. Recently, a new configuration of anaerobic reactor - the horizontal-flow anaerobic immobilized sludge (HAIS) reactor, has been proposed for the treatment of low-strength wastewaters. The sequence of fundamental and applied researches aiming to establish rational design parameters for the HAIS reactor scale-up is presented here.

On-line determination of sludge settling velocity for flux-based real-time control of secondary clarifiers

2006 ◽  
Vol 54 (11-12) ◽  
pp. 249-256 ◽  
Author(s):  
A. Lynggaard-Jensen ◽  
L. Lading
Keyword(s):  
Wastewater Treatment ◽  
Wastewater Treatment Plant ◽  
Control Algorithm ◽  
Suspended Solids ◽  
Settling Velocity ◽  
Treatment Plant ◽  
On Line ◽  
Sludge Settling ◽  
Settling Characteristics

The state diagram for operation of secondary clarifiers is used to design a control algorithm for the return sludge pumping and determination of the actual hydraulic capacity of the biological step of a wastewater treatment plant. On-line input for the control algorithm is derived from a sludge volume sensor and a suspended solids sensor in the form of software sensors giving values for the sludge settling characteristics – settling velocity, sludge volume index, initial settling velocity and the exponent in the Vesilind equation – allowing the control to accommodate the ever changing settling characteristics and thereby keep the suspended solids flux in the clarifiers in balance for both dry weather flows and during rain events. The control algorithm has been implemented, tested and set into normal operation on a full scale wastewater treatment plant.

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