Waste is the most horrible thing to our environment especially a waste from tannery industries. Kombolcha tannery since it is part of these industries it is affecting the people and brings drastic chance to the environment. Since this is the fact those treatment techniques are necessary to the factory like the one mentioned. In this study an aerobic pond is designed for tannery waste. It is possible to make suitable to our environment by treating it as per the type of the waste and degree of toxicity and hazard. This will be practiced only when the industrialists put themselves in to the boundaries of the industrial legislation otherwise good things will not happen unless the bad situation are developed. For the treatment techniques the one which has lower installation cost and lower running cost were used.
Key Words: Anaerobic pond, Tannery waste, Hazard
Table of Contents
Acknowledgement
Table of Contents
List of Acronyms
Abstract
1. Introduction
1.1 Background
1.2 Objectives
1.2.1 General Objectives
1.2.2 Specific Objectives
2. Waste in Leather Industry
2.1 Solid Waste
2.2 Effluents
2.3 Harmful Effects of Pollutant Present in Tannery Waste
2.3.1 Chromium
2.3.2 Sulfide
2.3.3 Organic
2.3.4 Suspended Mater
2.3.5 PH
3. Tanning of Leather
3.1 Origin and Properties of Tanning Material
3.1.1Trimming
3.1.2Washing and Soaking
3.1.3 Liming
3.1.4 Fleshing
3.1.5 Deliming and Bating
3.1.6 Pickling
3.1.7 Chrome Tanning
4. Waste Stabilization Ponds
4.1 Application of Waste Stabilization Pond Systems
4.2 Types of waste stabilization pond
4.2.1 Aerobic Ponds
4.2.2 Facultative Pond
4.2.3 Maturation ponds
5. Anaerobic Ponds
5.1 Description of Anaerobic Pond
5.2Treatment Mechanisms
5.3 Advantages and Disadvantages of Anaerobic Ponds
5.3.1 Advantages
5.3.2 Disadvantages
6. General Material Balance
6.1 Summary of the Material Balance
7. Pond Design
7.1 Flow Chart for the Treatment of Tanning Waste Water
7.2 Screen Design
7.3 Anaerobic Pond Design
7.4 Facultative Pond
7.5 Maturation Pond
7.6 Detail Design of Anaerobic Pond
7.7 Inlet outlet structure of anaerobic pond
8. Pond Layout
8.1 Pond Geometry
8.2 Inlet and Outlet Structure
8.3 Inlet Outlet Structure of Anaerobic Pond
9. Chrome Removal in Anaerobic Pond
9.1 Site Selection
10. Cost Analysis
11. Conclusion and Recommendation
11.1 Conclusion
11.2 Recommendation
References
Appendices
Appendix A: Percentage of effluents obtained in various processes (Calculated on total waste water in normal working method) (Pocket Book for the Leather Technologist, 1997)
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