Water Treatment Additives for Lagoons Amanda Bosak MDEQ Water Resources Division Permits Section

Transcription

1 Water Treatment Additives for Lagoons Amanda Bosak MDEQ Water Resources Division Permits Section

2 Presentation Overview What is a Water Treatment Additive (WTA)? When is a WTA Approval Not Needed? WTA Requests Information Required for WTA Request WTA Approval Process Approved, Not Approved Select WTAs FAQ and handout Helpful Links

3 What is a Water Treatment Additive (WTA)? Material added to condition or treat Examples of WTAs include: Pesticides (fungicides, biocides, herbicides) Disinfectants Coagulants (ferric chloride, alum)

4 When is a WTA Approval Not Needed? Land application of pesticides Rule 97 Certificate of Approval Application of materials to waters of the state for water resource management purposes Dennis Bush , BUSHD6@michigan.gov

5 When is a WTA Approval Not Needed? Aquatic Nuisance Control Permit Control aquatic nuisance species in waters of the state Aquatic Nuisance Control Contact: , deq-wrd-anc@michigan.gov NPDES Pesticide General Permit Pesticides applied not under another NPDES permit NPDES Pesticide General Permit Contact: Chris Conn , CONNC@michigan.gov

6 WTA Requests WTA requests - MiWaters Approval needed prior to use/discharge DEQ response 6-8 weeks Submit at any time

7 Information Required for WTA Request Facility and contact information Safety Data Sheet (SDS), formerly MSDS, and product label (for pesticides) Aquatic toxicity data for North American freshwater animals: A 48-hour LC50 or EC50: planktonic crustacean One other species E.g.: 96-hour LC50 for a fathead minnow Continued on Next Slide

8 Information Required for WTA Request Name of pond or cell to be treated Product Name Product Active Ingredient Discharge Frequency Outfall Type of Removal or Treatment WTA Function Volume, acres, and depth of cell or pond at treatment and discharge Continued on Next Slide

9 Information Required for WTA Request Total number of applications to each cell and days E.g. 2 Treatments on Day 0 and Day 14 in Cell 1 Date when wastewater will be discharged E.g. Day 90 Amount of product to be applied Initial concentration of active ingredient in each cell Calculations used for initial concentration Discharge concentration of active ingredient Calculations used for discharge concentration

10 Information Required for WTA Request Map of the lagoon system Wastewater Influent Cell 1 2,600,000 gal 2 acres 4 ft deep Sonar Treatment 1 treatment = 15.5 ounces Cell 2 1,950,000 gal 3 acres 3 ft deep Wastewater Discharge to Chris Creek

11 Water Treatment Additive Approval Aquatic toxicity data aquatic life values (ALVs) final acute value (FAV) and final chronic value (FCV) Compare proposed discharge concentration to FAV and FCV Approve discharge if proposed concentration below allowable values Do not approve discharge if proposed concentration above allowable values

12 Water Treatment Additive Approval WTA approvals are facility specific and depend on: receiving water body (e.g. flow) facility s authorized flow toxicity of the product proposed discharge concentration frequency of discharge

13 Conditional Approvals The discharge of the WTA may be approved with monitoring or use conditions such as: ph or copper monitoring Hold time of 120 days

14 Not Approved Why are requests not approved? Proposed discharge concentration exceeds allowable values Aquatic toxicity data not provided Aquatic toxicity data does not meet the minimum requirements Discharge concentration not provided

15 Not Approved What can you do when your request is not approved? Request can be revised and resubmitted for review: Decrease discharge concentration Use less product Consider removal, treatment, half-life time between treatment and discharge Conduct more aquatic toxicity tests on product Submit another request to use another product

16 Select Water Treatment Additives Commonly used products Requests MiWaters Limit in NPDES permit

17 Select Water Treatment Additives Constituent Corresponding NPDES Limited Parameter Calcium hypochlorite total residual chlorine (TRC) and ph Sodium hypochlorite TRC and ph Chlorine gas TRC and ph Sodium thiosulfate TRC and ph Sodium sulfite TRC and ph Sodium bisulfite TRC and ph Sodium metabisulfite TRC and ph Ferric chloride ph Aluminum sulfate (alum) ph Hydrochloric acid ph Phosphoric acid Phosphorus and ph Sodium hydroxide ph Sulfuric acid ph Sodium bisulfite ph and dissolved oxygen (DO)

18 Frequently Asked Questions The product is an Environmental Protection Agency (EPA) registered pesticide and I am following the label instructions, so why do I need to submit a WTA request? Registered Pesticide instructions protection of water quality standards Can you give me some advice on a product to use? We don t recommend products Do I need to submit a WTA request to discharge the WTA booster (adjuvant)? Yes

19 Frequently Asked Questions How do I calculate a dosing concentration? See handout How to I calculate a discharge concentration? See handout

20 Frequently Asked Questions Why can t I use barley straw? No Aquatic Toxicity data Do I need to be certified to use pesticides/herbicides? Maybe Do I need to submit a request every year? If nothing changes (product, amount used, depth of pond, etc.) then NO

21 Summary WTA request must have all required information WTA approval is required prior to use Approvals are facility specific Conditional approvals Request can be revised and resubmitted Select WTAs streamlined

22 Helpful Links For More Information Rules and regulations Laws and Rules and click on Applicable Rules and Regulations, Part 4 Rules, Rule 1057 Non-select WTA and Select WTA Water Treatment Additives MiWaters Pesticide Certification , Licensing, Certification, & Registration

23 Contact Information Amanda Bosak Christine Alexander