Wastewater Sludge Processing

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Wastewater Sludge Processing

Author: Izrail S. Turovskiy & P. K. Mathai | Size: 7.1 MB | Format: PDF | Quality: Original preprint | Publisher: Wiley-Interscience | Year: 2006 | pages: 354 | ISBN: 0471700541, 9780471700548

Reap the benefits of sludge

The processing of wastewater sludge for use or disposal has been a continuing challenge for municipal agencies. Yet, whensludge is properly processed, the resulting nutrient-rich product--biosolids--can be a valuable resource for agriculture and other uses. Wastewater Sludge Processing brings together a wide body of knowledge from the field to examine how to effectively process sludge to reap its benefits, yet protect public health. Presented in a format useful as both a reference for practicing environmental engineers and a textbook for graduatestudents, this book discusses unit operations used for processing sludge and the available methods for final disposition of the processed product. Topics discussed include sludge quantities and characteristics, thickening and dewatering, aerobicand anaerobic digestion, alkaline stabilization, composting, thermal drying and incineration, energy consumption, and the beneficial use of biosolids.

COMPREHENSIVE IN ITS COVERAGE, THE TEXT:
* Describes new and emerging technologies as well as international methods
* Compares different types of sludge processing methods
* Explains both municipal and industrial treatment technologies

Written by authors with decades of experience in the field, Wastewater Sludge Processing is an invaluable tool for anyone planning, designing, and implementing municipal wastewater sludge management projects.

Review :
Sludge essentially means the stuff from your toilet bowl. The authors explain how in a modern industrialised society, it is treated. The science [mostly chemistry] is given for the reactions that passivate the toxic parts. Along with the chemical engineering of the design of the processes and the treatment plants.

It's not just fluids that are dealt with, of course. During the processes, dry solids emerge, and these have to be handled properly. Another key issue is dewatering. The removal of as much water as possible from the sludge. Where the water might be filtered through various types of gravel and sand beds.

Finally, it is shown how the residual sludge has value as compost for farming. As little is wasted as possible.

Wastewater Sludge Processing brings together a wide body of knowledge from the field to examine how to effectively process sludge to reap its benefits, yet protect public health.

Features:

~ Discusses unit operations used for processing sludge and the available methods for final disposition of the processed product
~ Includes sludge quantities and characteristics, thickening and dewatering, aerobicand anaerobic digestion, alkaline stabilization, composting, thermal drying and incineration, energy consumption, and the beneficial use of biosolids

Contents

- 40 CFR Part 503 Regulation
- General Provisions
- Land Application
- Surface Disposal
- Pathogen and Vector Attraction Reduction
- Incineration

Sludge Quantities and Characteristics

- Types of Sludge
- Primary Sludge
- Secondary Sludge
- Chemical Sludge
- Other Wastewater Residuals
- Sludge Quantity
- Primary Sludge
- Secondary Sludge
- Activated Sludge
- Attached Growth System Sludge
- Chemical sludge
- Sludge Characteristics
- Primary Sludge
- Activated Sludge
- Physical and Biological Properties
- Mass Balance

Thickening and Dewatering

- Conditioning
- Factors Affecting Conditioning
- Chemical Conditioning
- Other Conditioning Methods
- Thickening
- Gravity Thickening
- Dissolved Air Flotation Thickening
- Centrifugal Thickening
- Gravity Belt Thickening
- Rotary Drum Thickening
- Miscellaneous Thickening Methods
- Dewatering
- Centrifugal Dewatering
- Belt Filter Press
- Pressure Filter Press
- Drying Beds
- Other Dewatering Methods

Aerobic Digestion

- Process Theory
- Conventional Aerobic Digestion
- Process Design Considerations
- System Design Considerations
- Operational Considerations
- Process Variations
- High-Purity Oxygen Digestion
- Low Temperature Aerobic Digestion
- Dual Digestion
- Mesophilic Aerobic Digestion
- Autothermal Thermophilic Aerobic Digestion
- Technological Improvements

Anaerobic Digestion

- Advantages and Disadvantages
- Theory of Anaerobic Digestion
- Environmental Factors
- Solids and Hydraulic Retention Times
- Temperature
- pH and Alkalinity
- Toxic Materials
- Process Variations
- Low-Rate Digestion
- High-Rate Digestion
- Thermophilic Digestion
- Two-Stage Digestion
- Two-Phase Digestion
- Process Design
- Per Capita Basis
- Solids Loading
- Solids Retention Time
- Volatile Solids Reduction
- Gas Production
- System Component Design
- Tank Design
- Digester Covers
- Heating
- Gas Usage
- Design Example 5-1
- Operational Considerations
- Reactor Performance
- Odor Control
- Supernatant
- Struvite
- Digester Cleaning

Alkaline Stabilization

- Advantages and Disadvantages
- Process Theory
- Process Application
- Liquid Lime Stabilization
- Dry Lime Stabilization
- Advanced Alkaline Stabilization Technologies
- Process Design
- Sludge Characteristics
- Contact Time and pH
- Lime Dosage
- Alkaline Material Storage
- Lime Feeding
- Liquid Lime Mixing
- Dry Lime Mixing
- Design Example 6-1
- Process Performance
- Odor Reduction
- Pathogen reduction
- Dewatering Characteristics

Composting

- Composting Process
- Composting Methods
- Advantages and Disadvantages of Composting
- Zoological Characteristics of Compost
- Process Description
- Factors Influencing Composting
- Windrow Process
- Aerated Static Pile process
- In-Vessel Process
- Design Considerations
- Theoretical Aspects of Composting
- Design Example 7-1
- New Technology in Composting
- Organic Content
- Odor
- Temperature and Moisture
- Composting Mixture
- Composting Process Control
- Design Example 7-2
- pH
- Examples of Composting in Europe
- Examples of Composting in the United States

Thermal Drying and Incineration

- Thermal Drying
- Methods of Thermal Drying
- Design Considerations
- Incineration
- Methods of Incineration
- Design Considerations

Comparison of Energy Consumption

- Anaerobic Digestion
- Incineration
- Composting
- Comparison of Thermal Drying and Composting

Beneficial Use of Biosolids

- Requirements for Beneficial Use
- Pollutant Limits
- Pathogen Reduction
- Vector Attraction Reduction
- Management Practices
- Surface Disposal
- Land Application
- Site Evaluation and Selection
- Design Application Rates
- Application Methods
- Application to Dedicated Lands
- Conveyance and Storage of Biosolids
- Beneficial Use of Biosolids in Russia
- Pathogens
- Heavy Metals

Index

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