X hits on this document

PDF document

Date: September 17, 1999 - page 7 / 9

21 views

0 shares

0 downloads

0 comments

7 / 9

High capital costs High energy costs Moderate operations and maintenance requirements Moderate/high chemical costs

Moderate noise and odor potential

Advantages

  • Produces a potentially marketable palletized fertilizer

  • Makeup of fertilizer may be modified based on market needs

Disadvantages

Biosolids Enrichment and Recycling

This proprietary technology makes use of a multi-step process

market

including

dewatering,

chemical

addition,

and

drying

to

produce

a

pellet

like

Class

A

biosolid.

Both

the

chemical addition and destruction, required to

mechanical drying, at high temperatures, provides for pathogenic organism meet Class A biosolids requirements. Chemical additions of phosphoric acid,

on

based

fertilizer,

“designer”

a

for

provide

to

varied

be

can

ammonia

and

sulfuric needs.

acid,

SITE SPECIFIC APPROACHES

Please note that in all cases an assumption was made that no income would be made from the bioslids product. If, in fact, Prescott Valley could market these products, operations and maintenance costs could be offset somewhat to reduce the overall cost of option.

Quick Dry Filter Beds/ Curing In this approach all the existing sand drying beds would be upgraded to quick dry filter beds. This would provide a solids handling capacity of over 1,000 dry tons per year. This is approximately 15% greater capacity than would be necessitated at the design flows and loads for this study. Dewatered solids (45%-65%) would be removed from the drying beds and applied to an impervious asphalt pad measuring 80’ x 500’ (this evaluation assumes the purchase of 1 acre of land for installation of the pad – cost included in financial evaluation) to allow for curing. This size pad would allow for a greater than 5 month storage capacity, allowing the biosolids to meet Class A Standards. The biosolids could then be used throughout Prescott Valley as a soil conditioner/fertilizer

for parks, offices, and private residences.

Quick Dry Filter Beds/On-Site Solids Storage/Contract Hauling & Beneficial Reuse

In this approach

all the existing sand drying beds would be upgraded to quick dry filter beds. This would provide a solids handling capacity of over 1,000 dry tons per year. This is approximately 15% greater capacity than would be necessitated at the design flows and loads for this study. Dewatered solids (45%-65%) would be stockpiled and maintained on-site 90 days on an impervious asphalt pad measuring 80’ x 250’ (this evaluation assumes the purchase of 0.5 acres of land for installation of the pad – cost included in financial evaluation). Class B biosolids produced in this scenario would be removed by a

contractor and beneficially reused outside of Prescott Valley.

Quick Dry Filter Beds/Autothermophilic Aerobic Digestion sand drying beds would be upgraded to quick dry filter beds

In this approach 50% of the existing . This would provide a solids handling

capacity of over 500 dry tons per year. This is approximately 15% greater capacity than would be necessitated at the design flows and loads for this study when you consider over a 50% reduction of

Document info
Document views21
Page views21
Page last viewedThu Dec 08 12:02:37 UTC 2016
Pages9
Paragraphs412
Words3028

Comments