Method of slurry dewatering and conversion of biosolids to a renewable fuel

A biosolids, conversion technology, applied in the direction of biofuels, solid fuels, waste fuels, etc., can solve the problems of controversial and expensive disposal of biosolids

Inactive Publication Date: 2007-10-17
SGC CONSULTING GRP INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The current problem is how to meet the demand for renewable energy
[0020] As mentioned above, the disposal of biosolids is increasingly expensive and controversial

Method used

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  • Method of slurry dewatering and conversion of biosolids to a renewable fuel
  • Method of slurry dewatering and conversion of biosolids to a renewable fuel
  • Method of slurry dewatering and conversion of biosolids to a renewable fuel

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0115] Biosolids from two wastewater treatment plants (one located in Atlanta Georgia and the other located in Riverside California) were treated as previously described at a continuous pilot plant to produce and analyze the following products, the following results excluding moisture and ash:

[0116] Atlanta Biosolids Riverside Biosolids

[0117] Carbon 57.73 62.53

[0118] Hydrogen 7.48 9.26

[0119] Nitrogen 7.90 7.52

[0120] Sulfur 3.02 1.17

[0121] Oxygen 23.86 19.52

[0122] Total 100.00 100.00

[0123] Atlanta coke product Riverside coke product

[0124] Carbon 70.19 69.98

[0125] Hydrogen 8.85 7.68

[0126] Nitrogen 8.63 8.45

[0127] Sulfur 1.42 8.86

[0128] Oxygen 10.91 5.04

[0129] Total 100.00 100.00

[0130] As expected, the evolution of carbon dioxide leads to an increase in the carbon content and a correspon...

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Abstract

In the processes for treating municipal sewage and storm water containing biosolids to discharge standards, biosolids, even after dewatering, contain typically about 80% water bound in the dead cells of the biosolids, which gives biosolids a negative heating value. It can be incinerated only at the expense of purchased fuel. Biosolids are heated to a temperature at which their cell structure is destroyed and, preferably, at which carbon dioxide is split off to lower the oxygen content of the biosolids. The resulting char is not hydrophilic, and it can be efficiently dewatered and/or dried and is a viable renewable fuel. This renewable fuel can be supplemented by also charging conventional biomass (yard and crop waste, etc.) in the same or in parallel facilities. Similarly, non-renewable hydrophilic fuels can be so processed in conjunction with the processing of biosolids to further augment the energy supply.

Description

technical field [0001] Sludge from sewage and wastewater treatment plants and the biosolids it contains pose serious disposal challenges. The term "biosolids" was officially recognized by the Water Environment Federation (WEF) in 1991 and the term is now widely used worldwide. The Water Environment Federation defines the term "biosolids" as the slimy residue from sewage during wastewater treatment. During wastewater treatment, bacteria and other tiny organisms break down sewage into simpler and more stable organic matter. This organic matter precipitates out with the bacterial cell mass, forming a biosolid. According to USEPA, biosolids that meet the Disposal and Contaminant Inventory criteria "can be safely recycled and used as fertilizer to continuously improve and maintain fertile soil and promote plant growth." [0002] Sludge is a mixture of biological solids (mainly composed of dead organic cells that are a by-product of sewage and wastewater treatment so that they ca...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C10L7/00
CPCY02E50/30Y02E50/10
Inventor N·L·迪肯森K·M·博林E·奥福斯特里特B·杜雷
Owner SGC CONSULTING GRP INC
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