Beneficial Reuse of Biosolids by Land Application
The City of Fort Worth produces Exceptional Quality (EQ) Class AB biosolids, resulting from an aggressive pre-treatment program and efficient wastewater treatment processes at the Village Creek Water Reclamation Facility.
Fort Worth produces approximately 26,500 dry tons of biosolids each year from the wastewater treatment system processes, which is offered to farmers and landowners across North Texas as a valuable soil amendment. These biosolids contain important nutrients that have been shown to boost crop production.
The Village Creek Water Reclamation Facility has developed and implemented an environmental management system (EMS) for its Biosolids Program. The EMS, which is platinum certified by the National Biosolids Partnership (NBP), helps the Village Creek Water Reclamation Facility to manage and continually improve all aspects of its Biosolids Program, including solids treatment, dewatering, transporting, and beneficial land application. The Fort Worth Biosolids Program was one of the original programs to volunteer to become a NBP Demonstration Agency, becoming the seventh agency in the country and the first in Texas to receive the NBP EMS certification.
Biosolids Processing and Dewatering
Anaerobically treated biosolids are dewatered by belt filter presses, resulting in a cake product that is approximately 16 percent to 18 percent solids. This material is further stabilized with lime to eliminate pathogens. The final product is Environmental Protection Agency (EPA) Class A Exceptional Quality (EQ) Biosolids, also known as TCEQ Class AB Biosolids.
Beneficial Reuse by Land Application
Since 1995, the City of Fort Worth’s goal has been to beneficially reuse and recycle all biosolids. The biosolids produced at Village Creek Water Reclamation Facility are processed, monitored and applied to thousands of acres of farm and pasture land in Tarrant and surrounding counties in the North Texas area. Biosolids contain nitrogen, phosphorus, organic material and other important constituents that allow it to be utilized as a high value soil amendment.
The Biosolids Program continues to grow and expand with new land application sites added each year. The program currently has a backlog list of landowners waiting for biosolids to be applied to their property. The map and the table below show the landowner participation by county in the Fort Worth Biosolids Beneficial Reuse/Recycling Program.
Fort Worth Biosolids Beneficial Reuse/Recycling Program: Land owner participation location by county
|Counties||Land Owners||Noticed Sites||Noticed Acres||% of Total Acreage||Tons Applied
AUG 20145-JUL 2016
The city currently has one biosolids contractor, RENDA Environmental Inc. (REI). REI is responsible for:
- operating the dewatering facility and further processing the biosolids by belt-filter press dewatering
- stabilization by lime addition
- land application to beneficially reuse the biosolids produced at Village Creek Water Reclamation Facility.
The Water Department performs routine and unannounced visits and inspections to the dewatering facility and land application sites to ensure that best biosolids management practices are followed concerning biosolids dewatering, transportation and land application.
Monitoring and Measurement
By city contract, the contractor uses an independent certified laboratory to analyze the biosolids produced at Village Creek Water Reclamation Facility.
Samples of biosolids are taken from the process areas and analyzed for fecal coliform, pathogens, metals, PCBs, pH, percentage solids, and vector attraction reduction. Sampling frequency is established by the contract, federal, state, and local regulatory reporting requirements and is summarized in the table.
Class “AB” Biosolids Monitoring — Fort Worth Biosolids Program
- Pathogen Reduction: 30 Texas Administrative Code (TAC) 312.82 (a) Alternative 4
- Fecal Coliform Density less than 1000 MPN* (*Most Probably Number)
- Enteric Virus Density less than 1 Plaque-forming unit per 4 gram total solids**
- Viable Helminth Ova Density less than 1 per 4 grams total solids** (**Dry weight basis)
- Vector Attraction Reduction: 30 TAC 312.83 (b) (1-8) Alternative 1
- The mass of volatile solids in the sewage sludge shall be reduced by a minimum of 38 percent.
Monitored Item Frequency Fecal Coliform Two times per month Pathogens Two times per month Metals Monthly PCBs Monthly Toxicity Characteristic Leaching Procedure (TCLP) Two times per year pH (Vector Attraction Reduction) Operation Process-Daily; Regulatory Compliance-Weekly % Solids Daily
Ten metals and polychlorinated biphenyls (PCBs) are analyzed monthly. In FY 2015-2016, all metal concentrations were significantly below Table 1 ceiling concentration limits and Table 3 pollutant concentrations, as required by the U.S. EPA Part 503 federal regulations for the use or disposal of sewage sludge. The metal concentrations are below.
Average Monthly Metal & PCB* Concentrations
(reported in milligrams/kilograms [mg/kg] dry weight basis)
|Year 2015-2016||Arsenic (AS) mg/kg||Cadmium (Cd) mg/kg||Chromium (Cr) mg/kg||Copper (Cu)
|Lead (Pb)mg/kg||Mercury (Hg)mg/kg||Molybdenum (Mo)
|NPDES** Permit Limits (Table 1)||75||85||3000||4300||840||57||75||420||100||7500||n/a|
|NPDES** Permit Limits (Table 3)||41||39||1200||1500||300||17||+||420||36||2800||n/a|
|Yearly Average Metals Concentration||10.25||0.92||45.16||475.08||24.10||0.38||15.32||28.91||4.75||563||ND|
|Highest Monthly Concentration||17.10||1.4||70.10||627.00||30.80||0.82||21.40||43.50||6.00||703||ND|
* Polychlorinated biphenyls
** National Pollutant Discharge Elimination System
- No limit established by federal regulations
Pathogen Requirement Achieved: EPA Class A/TCEQ Class AB
Pathogen Reduction Alternative Used: 4
Vector Attraction Reduction Alternative Used: Alternative 1
For more information about the City of Fort Worth Biosolids “Beneficial Reuse/Recycling” Program and the Fort Worth Biosolids EMS program, please call or email:
|**Village Creek Water Reclamation Facility||817-392-4960**|
|**Biosolids EMS Manager||817-392-4965**|
To review and/or download the Biosolids Program Environmental Management System’s documents and annual reports.
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