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The science of composting

Eliot Epstein
TLDR
In the United States, Composting has been widely used in the past few decades for a variety of purposes, such as soil fertility, soil health, water quality, and sustainability as mentioned in this paper.
Abstract
Preface Composting: A Prospective Composting and Recycling History Philosophical Aspects and the Future of Composting in the United States Advantages and Disadvantages of Composting Conclusion References Basic Concepts Introduction Oxygen and Aeration Moisture Temperature Nutrients: Carbon, Nitrogen, pH Summary References Microbiology Introduction Microbial Populations Temperature Moisture Nutrients Inoculants Summary References Biochemistry Introduction Organic Matter Biochemical Manifestations Occurring during Composting Biochemical Manifestations Occurring When Compost Is Applied to Soil Humus Formation Summary References Stability, Maturity, and Phytotoxicity Introduction Stability and Maturity: Chemical Methods Carbon/Nitrogen Ratio (C/N) Nitrogen Species pH Cation Exchange Capacity (CEC) Organic Chemical Constituents Humification Parameters Humification Index Relative Concentrations of Humic Acid to Fulvic Acid Humic Substance Functional Groups Optical Density Physical Methods Temperature and Heat Output Color, Odor, Structure and Specific Gravity Plant Assays Microbiological Tests and Activities Respiration-Carbon Dioxide Evolution Respiration-Oxygen Uptake Microbial Changes Enzyme Activity Phytotoxicity Summary References Trace Elements, Heavy Metals, and Micronutrients Introduction Essentiality and Toxicity Arsenic (As) Boron (B) Cadmium (Cd) Copper (Cu) Lead (Pb) Mercury (Hg) Molybdenum (Mo) Nickel (Ni) Selenium (Se) Zinc (Zn) Occurrence in the Environment Environmental Consequences Leachate Characteristics of Compost Soil-Plant Interactions Type of Trace Element and Chemical State Soil Acidity Organic Matter Cation Exchange Capacity (CEC) Reversion to Unavailable Forms Other Aspects Effect of Compost on Trace Element Uptake Summary References Organic Compounds Introduction Organic Compounds in Various Compost Materials and Feedstocks Fate of Organic Compounds during Composting Reactions and Movement of Toxic Organics in Soil Uptake by Plants and Potential Entry into the Food Chain Conclusion References Pathogens Introduction Primary Pathogens in Wastes and Compost Worker Health Risks of Solid Waste Composting The Effect of Composting on Pathogen Destruction Survival of Pathogens in Soils and on Plants Conclusions References Bioaerosols Introduction Aspergillus Fumigatus Morphology Pathogenicity Occurrence in the Environment Occurrence in and Around Composting Facilities Dickerson, Maryland Site II, Maryland Westbrook, Maine Windsor, Ontario Hampton Roads, Virginia Beltsville, Maryland Camden, New Jersey Yard Waste Composting Facilities MSW Composting Facility Other Studies Endotoxin and Organic Dusts Conclusions References Odors and Volatile Organic Compounds Introduction Odorous Compounds and Odors Emitted by Composting Facilities Volatile Organic Compounds Air Dispersion Modeling for Composting Facilities Regulatory Models Model Parameters Gassian Dispersion and Dispersion Parameters Treatment of Terrain Reliability of Model Results Peak-to-Mean Conversion for Assessing Odor Impacts Examples of Dispersion Modeling for Composting Facilities Conclusion References Soil Physical and Chemical Manifestations Introduction Effect of Compost Application on Soil Physical Properties Soil Structure Bulk Density Soil Strength Water Relations-Soil Water Retention and Available Water to Plants Runoff and Soil Erosion Soil Temperature Effect of Compost Application on Soil Chemical Properties Cation Exchange Capacity Soil pH Electrical Conductivity (EC) Nitrogen Availability in Soil Nitrogen Leaching Summary References Utilization of Compost Introduction Horticulture Ornamental Flowering and House Plants Sod Production and Turf Grass Establishment Agricultural Crops Field Crops Vegetable Crops Silviculture Conclusion References Compost Utilization II Introduction Plant Pathogen Destruction during Composting Plant Disease Suppression Biofiltration Basic Concepts Moisture Content pH Nutrients Temperature Microbiology Application Summary References Regulations Introduction Concepts and Approaches to Regulations United States Federal Regulations State Regulations in the United States New York Tennessee Composting Facility General Requirements Facility Design and Construction Compost Standards California Canada Europe Austria Denmark Germany Italy Netherlands Criteria for Compost Quality and Facility Design: Compost Quality Criteria Facility Design Criteria Conclusion References Index

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Journal ArticleDOI

Long-term effects of organic amendments on soil fertility. A review

TL;DR: In this paper, the effects of organic amendments used both for organic matter replenishment and to avoid the application of high levels of chemical fertilizers were reviewed. But the major points of their analysis are: (1) many effects, e.g. carbon sequestration in the soil and possible build-up of toxic elements, evolve slowly, so it is necessary to refer to long-term trials.
Journal ArticleDOI

A review of the use of composted municipal solid waste in agriculture

TL;DR: In this article, a review of relevant agricultural studies is presented as well as recommendations for improving MSW compost quality, which can be ensured with source separation and triage of MSW to be composted.
Journal ArticleDOI

The influence of temperature and moisture contents regimes on the aerobic microbial activity of a biosolids composting blend

TL;DR: In this study, moisture content proved to be a dominant factor impacting aerobic microbial activity of the composting blend and the enhancement of composting activities induced by temperature increment could be realized by increasing moisture content alone.
Book ChapterDOI

Long-Term Effects of Organic Amendments on Soil Fertility

Abstract: Common agricultural practices such as excessive use of agro-chemicals, deep tillage and luxury irrigation have degraded soils, polluted water resources and contaminated the atmosphere. There is increasing concern about interrelated environmental problems such as soil degradation, desertification, erosion, and accelerated greenhouse effects and climate change. The decline in organic matter content of many soils is becoming a major process of soil degradation, particularly in European semi-arid Mediterranean regions. Degraded soils are not fertile and thus cannot maintain sustainable production. At the same time, the production of urban and industrial organic waste materials is widespread. Therefore, strategies for recycling such organic waste in agriculture must be developed. Here, we review long-term experiments (3–60 years) on the effects of organic amendments used both for organic matter replenishment and to avoid the application of high levels of chemical fertilizers. The major points of our analysis are: (1) many effects, e.g. carbon sequestration in the soil and possible build-up of toxic elements, evolve slowly, so it is necessary to refer to long-term trials. (2) Repeated application of exogenous organic matter to cropland led to an improvement in soil biological functions. For instance, microbial biomass carbon increased by up to 100% using high-rate compost treatments, and enzymatic activity increased by 30% with sludge addition. (3) Long-lasting application of organic amendments increased organic carbon by up to 90% versus unfertilized soil, and up to 100% versus chemical fertilizer treatments. (4) Regular addition of organic residues, particularly the composted ones, increased soil physical fertility, mainly by improving aggregate stability and decreasing soil bulk density. (5) The best agronomic performance of compost is often obtained with the highest rates and frequency of applications. Furthermore, applying these strategies, there were additional beneficial effects such as the slow release of nitrogen fertilizer. (6) Crop yield increased by up to 250% by long-term applications of high rates of municipal solid waste compost. Stabilized organic amendments do not reduce the crop yield quality, but improve it. (7) Organic amendments play a positive role in climate change mitigation by soil carbon sequestration, the size of which is dependent on their type, the rates and the frequency of application. (8) There is no tangible evidence demonstrating negative impacts of heavy metals applied to soil, particularly when high-quality compost was used for long periods. (9) Repeated application of composted materials enhances soil organic nitrogen content by up to 90%, storing it for mineralization in future cropping seasons, often without inducing nitrate leaching to groundwater.
Journal ArticleDOI

Effect of C/N on composting of pig manure with sawdust

TL;DR: Co-composting of pig manure with sawdust at a low initial C/N would require a composting longer than 63 days, and, the high salinity due to the large amount of pork manure would pose a potential inhibition on plant growth.