Presentation on theme: "Advanced Operator Short Schools Waste Water Treatment Cal Sawyer/Mark Anderson."— Presentation transcript:
Advanced Operator Short Schools Waste Water Treatment Cal Sawyer/Mark Anderson
Virginia Department of Health
Drinking Water Cycle
Typical Waster Treatment Schematic
Location is Critical
Advanced Operator Short Schools PROPOSED SEWAGE COLLECTION AND TREATMENT REGULATIONS JULY 2001
SCAT Regulations FPROCEDURAL REGULATIONS FA.Permits (12 VAC ) FNo owner shall cause or allow the construction, expansion, or modification (change of 20% or more in capacity or performance capability) of a sewerage system or treatment works without a written Construction Permit issued by the Commissioner. FNo owner shall cause or allow the operation of any sewerage system or treatment works without an Operation Permit issued by the Commissioner.
SCAT Regulations B.Permit Procedures (12 VAC ) The request for a Construction Permit in the form of plans and specifications is to be submitted to the appropriate DWE field staff with the assigned responsibility for the area where the sewerage system or treatment works is located.
The procedure for obtaining the Permit includes one or more of the following: -Submission of an Application. -Preliminary Engineering Conference. -Submission of Preliminary Engineering Proposal. -Submission of Plans, Specifications, and Design Criteria.
SCAT Regulations C. Sewerage Systems and Treatment Works Reliability (12 VAC ) FReliability is a measurement of the ability of a component or the whole system to perform its designated function without failure or interruption of service. FReliability classification is a major consideration for discussion at the PEC. FReliability classification is based on the water quality and public health consequences of a component or system failure.
SCAT Regulations IV.MANUAL OF PRACTICE FOR SEWERAGE SYSTEMS AND TREATMENT WORKS (12VAC VAC ) FThe manual of practice or Part III of the regulations establishes design criteria and standards for the proper design of the following: 1.Collection and Conveyance System. 2.Sewage Pump Stations and Force Mains. 3.Sewage Treatment Works. 4.Sludge Treatment Processes.
Collection FAbout 100 gpd per capita dry weather flow FWet weather flows from inflow into system may produce peak flows up to 10 times the dry weather values
Pump stations FUse of Gravity Flow with minimum pipe diameter may not be possible due to level ground surface FPump Stations with a force main conveying flow under pressure to a higher elevation may be necessary
Sewage Treatment Works FTreatment Processes include: 1.Primary Treatment. 2.Secondary Treatment. 3.Advanced or Tertiary Treatment. 4.Disinfection. 5.Sludge Processing and Management.
Bar Screen FRacks of bars placed across the flow passing into a treatment process through an interceptor prevent large objects from interfering with the treatment equipment
Primary Settling FPrimary Clarification provides a large detention volume for the untreated sewage to pass through where suspended matter settles through flocculation to the basin bottom as a primary sludge
Secondary Treatment FSecondary Treatment involves a reactor to promote controled microorganism growth(Biomass) followed by a clarifier to separate the Biomass from the secondary effluent
Secondary Treatment FSecondary effluent passes on to further treatment and the secondary sludge or Biomass is divided into portions that either are returned to the reactor or sent to the sludge handling process
Advanced Treatment FAdvanced Treatment uses tertiary processes such as filtration, chemical clarification and nutrient removal to remove refractory constituents including nitrogen and phosphorus
SCAT Regulations Advanced or Tertiary Treatment Processes include: (12 VAC to 12 VAC ) Chemical Clarification. Filtration. Natural Treatment (land treatment). Nitrification and Denitrification.
Disinfection FDisinfection reduces the microorganism population including pathogens to a level that is safe to release to the receiving environment. Coliform Bacteria levels are measured to verify disinfection
SCAT Regulations Disinfection Processes include :(12 VAC to 12 VAC ) Chlorination/Dechlorination. Ultraviolet Light Irradiation (U.V.). Ozonation. Other Halogens.
Disinfection FDisinfection is commonly accomplished by introducing chlorine into the treated effluent. FChlorine molecules combine with ammonia to form residual chlorine
Disinfection FResidual chlorine in contact with the treated effluent for 30 minutes or more at a 1.0 mg/l level will inactivate pathogenic bacteria and viruses FThe Fecal Coliform level should be less than 200 organisms per 100 milliliters
UV Disinfection FUltraviolet Light Irradiation with germicidal UV emitting lamps enclosed in quartz glass sleeves submerged in treated effluent is an alternative to chlorination
Water Reuse FHighly treated disinfected effluent can be used for irrigation of soil for landscaping, agricultural crop production and other uses, as well as industrial process water
Digestion FPrimary and Secondary sludge is further processed to remove as much water as possible and then treated by biological, chemical, or thermal processes, to stabilize the organic matter
Dewatering FPrimary sludge may have up to 5% suspended solids(TSS) and Secondary sludge may have up to 2% TSS. Dewatering is designed to obtain up to 5% TSS in the combined sludge sent to further treatment
Biosolids Recycling FSludge may be treated to a level that allows it to be recycled as BiosolidsSludge may be treated to a level that allows it to be recycled as Biosolids FA number of regulated trace elements must be measured and not exceed established standardsA number of regulated trace elements must be measured and not exceed established standards Fwww.biosolids.state.va.uswww.biosolids.state.va.us Fhttp://biosolids.policy.net
What is in BIOSOLIDS? FNutrient-rich(nitrogen and phosphorus) organic material resulting from the treatment of wastewater and sewage sludge FDry solid content is mostly paper and hair fibers FContains millions of microorganisms per gram of dry solids, some of which can infect and cause disease(pathogenic) in susceptible highly exposed individuals FContains trace elements from sewage including toxic chemicals at very low levels
USE Closing the Recycling Loop FReturn elements to the soil to fertilize crops FPromote Sustainable Farming FProtect the Environment l Health l Water Quality
Regulation of Biosolids VDH Contractors DEQ System Owners Used in Virginia as a nutrient-rich organic fertilizer DCR Nutrients Regulated in Virginia by permits since 1979 VDACS Crops/Animals
Biosolids Treatment and Quality Control FClass A Pathogen Control - almost complete removal of microorganisms FClass B Pathogen Control - Reduction of microorganisms FTrace Elements Monitored according to risk assessment FTreatment Process Verified FQuality Monitored(reduce vector attraction for use)
Biosolids Use Regulations (12 VAC 5-585) FPermits Specific Sites - County - Contractor/Land Applier - Land Owner/Farmer Agreement FManagement Practices FNutrient Management FBiosolids Quality based on 40 CFR 503 Standards Information
The public has always been greatly concerned about the effect on their health from exposure to waste matter regardless of the source Neighbors adjoining farmland on which odorous matter is applied become concerned about Aerosol borne disease and pollution of water, especially shallow drinking water wells These concerns quickly become Political Issues Public Concerns
Wastewater Solids CysteineMethionine Other Organics Organic Sulfur Hydrogen Sulfide Methyl mercaptan Dimethylsulfide Dimethyldisulfide Organic Nitrogen Amino Acids Ammonia Amines Limonenes Organic Acids Complexity of Odor Generation from Biosolids
Gases Particulates Organic & Inorganic Aerosols Health Effects Psychological Effects Odor Toxicity, pathogens Subjective Objective Effects Model
Remote is Best
Current Program FOver 80 Permits Issued F35 Counties Contain Permitted Sites FOver 250,000 Acres of Permitted Sites FOver 35,000 Acres Receive Biosolids Annually Benefits
Local Ordinances FCurrent Regulations are reasonably restrictive and special permit conditions can be imposed FModel Ordinance could include local concerns FMaintain an effective Response to complaints Balance
Fee Regulation FLocal Ordinances consistent with State Regs FFees based on amount of biosolids applied FReimbursement of local oversight from fees FReasonable testing costs included Verification
Advisory Committees FRegulations Advisory Committee (BUR) FBiosolids Information Committee (BUIC) FLocal Task Forces (County) DISCUSSIONS
Responsibilities FDepartment of Health FDepartment of Conservation and Recreation FCounty Government FContractor FFarmer FResidents