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EVALUATION OF PARAMETERS FOR THE DESIGN OF ANAEROBIC LAGOONS TREATING FELLMONGERY (UNHAIRING) WASTEWATER Paul N. McFarlane. Lecturer Biotechnology Department Massey University Palmerston North, New Zealand Henryk Melcer, Project Engineer Associated Water and Air Resources Engineers, Inc. Nashville, Tennessee 37204 INTRODUCTION Lagoons have become widely accepted as an alternative form of wastewater treatment. However, the use of facultative lagoons to treat wastewaters containing significant concentrations of sulfide can create operational problems in terms of inhibition, odor and color. Sulfide concentrations as low as 4 mg/l inhibit some algae [1]. The Chromatiaceae, or purple sulphur bacteria, tend to predominate in overloaded lagoons or those treating sulfide-bearing wastewaters [2,3]. They are phototrophic bacteria, photosynthesis occurring only under anaerobic conditions and not involving oxygen. They are dependent upon the presence of oxidizable external electron donors such as reduced sulphur compounds, molecular hydrogen or simple organic compounds. Although their dominance in lagoons is often unintended, the ability of these bacteria to oxidize reduced sulfur compounds under anaerobic conditions may be exploited in the treatment of some specific wastewaters. In New Zealand, this application is most suited to the fellmongery (unhairing) industry in which hair or wool is removed from animal skins prior to tanning by treatment with a lime-saturated solution of sodium sulfide. Subsequent washing of the treated skins produces a noxious, alkaline, sulfide- bearing wastewater. One lagoon system in New Zealand has satisfactorily treated a fellmongery wastewater in this manner for some years [4] but little data are available for the design of lagoon systems using the Chromatiaceae to treat fellmongery wastewater. These studies were implemented to generate such data. METHODS Two, 88-liter model lagoons were constructed and operated according to the procedures outlined by Eckenfelder and Ford [5] and Eckenfelder et al. [6]. Figure 1 presents a side elevation of the model lagoons. Data were collected using an experimental design which required six trials. The effects of temperature and sulfide concentration on the effluent quality were investigated at the conditions indicated in Table I. These values were chosen to simulate lagoon temperatures in New Zealand and also to investigate the viability of treating segregated fellmongery wastewaters containing high concentrations of sulfide. 479
Object Description
Purdue Identification Number | ETRIWC1978054 |
Title | Evaluation of parameters for the design of anaerobic lagoons treating fellmongery (unhairing) wastewater |
Author |
McFarlane, Paul N. Melcer, Henryk |
Date of Original | 1978 |
Conference Title | Proceedings of the 33rd Industrial Waste Conference |
Conference Front Matter (copy and paste) | http://e-archives.lib.purdue.edu/u?/engext,27312 |
Extent of Original | p. 479-486 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University LIbraries |
Rights Statement | Digital object copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Date Digitized | 2009-06-22 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Resolution | 300 ppi |
Color Depth | 8 bit |
Description
Title | page0479 |
Collection Title | Engineering Technical Reports Collection, Purdue University |
Repository | Purdue University Libraries |
Rights Statement | Digital copyright Purdue University. All rights reserved. |
Language | eng |
Type (DCMI) | text |
Format | JP2 |
Capture Device | Fujitsu fi-5650C |
Capture Details | ScandAll 21 |
Transcript | EVALUATION OF PARAMETERS FOR THE DESIGN OF ANAEROBIC LAGOONS TREATING FELLMONGERY (UNHAIRING) WASTEWATER Paul N. McFarlane. Lecturer Biotechnology Department Massey University Palmerston North, New Zealand Henryk Melcer, Project Engineer Associated Water and Air Resources Engineers, Inc. Nashville, Tennessee 37204 INTRODUCTION Lagoons have become widely accepted as an alternative form of wastewater treatment. However, the use of facultative lagoons to treat wastewaters containing significant concentrations of sulfide can create operational problems in terms of inhibition, odor and color. Sulfide concentrations as low as 4 mg/l inhibit some algae [1]. The Chromatiaceae, or purple sulphur bacteria, tend to predominate in overloaded lagoons or those treating sulfide-bearing wastewaters [2,3]. They are phototrophic bacteria, photosynthesis occurring only under anaerobic conditions and not involving oxygen. They are dependent upon the presence of oxidizable external electron donors such as reduced sulphur compounds, molecular hydrogen or simple organic compounds. Although their dominance in lagoons is often unintended, the ability of these bacteria to oxidize reduced sulfur compounds under anaerobic conditions may be exploited in the treatment of some specific wastewaters. In New Zealand, this application is most suited to the fellmongery (unhairing) industry in which hair or wool is removed from animal skins prior to tanning by treatment with a lime-saturated solution of sodium sulfide. Subsequent washing of the treated skins produces a noxious, alkaline, sulfide- bearing wastewater. One lagoon system in New Zealand has satisfactorily treated a fellmongery wastewater in this manner for some years [4] but little data are available for the design of lagoon systems using the Chromatiaceae to treat fellmongery wastewater. These studies were implemented to generate such data. METHODS Two, 88-liter model lagoons were constructed and operated according to the procedures outlined by Eckenfelder and Ford [5] and Eckenfelder et al. [6]. Figure 1 presents a side elevation of the model lagoons. Data were collected using an experimental design which required six trials. The effects of temperature and sulfide concentration on the effluent quality were investigated at the conditions indicated in Table I. These values were chosen to simulate lagoon temperatures in New Zealand and also to investigate the viability of treating segregated fellmongery wastewaters containing high concentrations of sulfide. 479 |
Resolution | 300 ppi |
Color Depth | 8 bit |
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