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Waste to energy ash and engineered aggregate in road construction

Inactive Publication Date: 2017-12-28
UNIV OF FLORIDA RES FOUNDATION INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The patent describes compositions of waste-to-energy bottom ash (WTE BA) and methods for separating and altering them. The WTE BA can be reacted with CO2 from a CO2 source to form cement or asphalt compositions. The compositions can also contain other materials like coal fly ash or sand. The technical effects of the patent include the ability to recycle waste and produce useful products from it.

Problems solved by technology

While WTE BA displays potential for these applications, problems such as hydrogen gas generation and heavy metal leaching preclude the widespread use of WTE BA in road construction.

Method used

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  • Waste to energy ash and engineered aggregate in road construction
  • Waste to energy ash and engineered aggregate in road construction
  • Waste to energy ash and engineered aggregate in road construction

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example 1

1.0 Introduction

[0075]It is well known that waste-to-energy (WTE) bottom ash (BA) represents a potential material for inclusion into the circular economy and that this resource is under utilized in many parts of the world [1]. Many uses for WTE BA have focused on reuse as a component in roadway construction projects including: the use of WTE BA as a roadway base course [1-4] or as an aggregate replacement in hot mix asphalt (HMA) or Portland cement concrete (PCC) pavements [5-10]. The use of recycled WTE BA as a road base course can result in the release of relatively small amounts of certain trace elements into the environment [2, 3, 11]. Additionally, because heavy metals are enriched in the ash during the combustion processes, total concentrations of certain trace elements have been found to exceed risk-based concentration thresholds for direct human exposure (depending on the thresholds used) [1, 12, 13].

[0076]One avenue to mitigate some of the potential concerns (leaching and d...

example 2

1.0 Introduction

[0164]The beneficial use of waste-to-energy (WTE) bottom ash (BA) as a construction material has been a significant focus of civil and environmental researchers for the past several decades [1-7]. Because the particle size of the ash is similar to that of most conventional pavement aggregates, reuse in road construction projects is often cited as the most practical beneficial use application. In many countries, including the United States, WTE BA represents a relatively high volume material stream that is normally landfilled and could be acquired at a reasonably low cost. This provides an additional incentive for recycling [8]. The beneficial use of WTE BA in construction applications around the world have focused on use as a road base [9, 10] as well as the use of BA as an aggregate in Portland cement concrete (PCC). However use in PCC has been challenging in some instances as components within the ash can cause deleterious effects within the concrete matrix to some...

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Abstract

Described herein are compositions and methods for waste-to-energy ash in engineered aggregate in road construction.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This application claims priority to U.S. provisional application entitled “WASTE TO ENERGY ASH AND ENGINEERED AGGREGATE IN ROAD CONSTRUCTION,” having Ser. No. 62 / 353,732, filed on Jun. 23, 2016, which is entirely incorporated herein by reference.BACKGROUND[0002]Waste-to-energy (WTE) is a form of energy recovery that can generate energy, such as heat or electricity, from the primary treatment of waste. Incineration is a primary treatment used frequently in WTE schemes that generates ash byproducts (fly ash and bottom ash) during waste incineration and energy generation. There is currently interest in systems and methods directed at the reuse recycling of WTE ash instead of landfill disposal. The use of WTE bottom ash (BA) as a roadway base course or as an aggregate replacement in hot mix asphalt (HMA) or Portland cement concrete (PCC) pavements are potential applications for WTE BA recycling. While WTE BA displays potential for these applic...

Claims

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Application Information

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IPC IPC(8): E01C3/00C04B28/04C08L95/00C04B18/04C04B111/00
CPCE01C3/003C04B28/04C04B2111/0075C04B18/049C08L95/005C04B26/26C04B20/02C04B2111/10Y02W30/91C04B14/28C04B18/06C04B18/08C04B20/0076
Inventor TOWNSEND, TIMOTHY G.ROESSLER, JUSTIN G.FERRARO, CHRISTOPHER C.
Owner UNIV OF FLORIDA RES FOUNDATION INC