Wastewater Treatment Plant Chemical Perspectives. Presented By: Brian Villacorta, P.E., BCEE Los Angeles County Sanitation Districts

Transcription

1 Wastewater Treatment Plant Chemical Perspectives Presented By: Brian Villacorta, P.E., BCEE Los Angeles County Sanitation Districts

2 EARLY CIVILIZATIONS AND CHEMICAL TREATMENT 1500 BC Wall images found in Egyptian tomb of Amenophis II and Ramses II

3 PRESENTATION OVERVIEW WWTP Process and Chemical Overview Chemical Calculations Chemical Identification Chemical Hazards & PPE Chemical Regulations

4 MOTHER NATURE

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6 CHEMICAL CALCULATIONS Find: Chemical Usage in Gallons per Day Given: Dosage (mg/l) Flow rate (MGD) % Active Concentration Specific Gravity Formula GPD = mg/l * MGD * 8.34 lb/mg/mg/l % Act * 8.34 lb/gal * SG

7 CHEMICAL CALCULATIONS Find: Chemical Usage in Gallons per Day Chemical: ANIONIC POLYMER % Active Concentration, 28%-40% Specific Gravity, 1.01 Sample Calculation GPD = 0.5 mg/l * 25 MGD * 8.34 lb/mg/mg/l (40/100) * 8.34 lb/gal * 1.01 GPD = 31 gallons of polymer/day

8 CHEMICAL CALCULATIONS Find: Chemical Usage in Pounds per Day Chemical: LIQUID CHLORINE Sample Calculation PPD = 5 mg/l * 25 MGD * 8.34 lb/mg/mg/l PPD = 1043 lbs Cl2/day

9 CHEMICAL CALCULATIONS Find: Chemical Usage in Gallons per Day Chemical: SODIUM HYPOCHLORITE % Active Concentration, 12.5% Specific Gravity, 1.22 Industry Conversion = 1.05 lb NaOCl / 1 lb Cl2 GPD = 5 mg/l * 25 MGD * 8.34 lb/mg/mg/l (12.5/100) * 8.34 lb/gal * 1.22 * (1lb Cl2/1.05lb NaOCl) GPD = 860 gallons of NaOCl/day

10 CHEMICAL CALCULATIONS Find: Chemical Usage in Pounds per Day Chemical: SULFUR DIOXIDE Industry Conversion = 0.9 lb SO2 / 1 lb Cl2 PPD = 5 mg/l * 25 MGD * 8.34 lb/mg/mg/l (1 lb Cl2/0.9 lb SO2) PPD = 938 lbs SO2/day

11 CHEMICAL CALCULATIONS Find: Chemical Usage in Gallons per Day Chemical: SODIUM BISULFITE % Active Concentration, 25% Specific Gravity, 1.2 Industry Conversion = 1.46 lb NaHSO3 / 1 lb Cl2 GPD = 4 mg/l * 25 MGD * 8.34 lb/mg/mg/l (25/100) * 8.34 lb/gal * 1.2 * (1lb Cl2/1.46lb NaHSO3) GPD = 487 gallons of NaHSO3/day

12 CHEMICAL IDENTIFICATION NFPA 704 Diamond Labels and Ratings

13 CHEMICAL IDENTIFICATION Chlorine Caustic Sulfur Dioxide Ammonia W COR

14 CHEMICAL IDENTIFICATION Sodium Hypochlorite Sodium Bisulfite Ferric Sulfate Alum 0 1 1

15 CHEMICAL IDENTIFICATION Anionic Polymer Cationic Polymer Ferric Chloride Ferrous Chloride

16 CHEMICAL IDENTIFICATION Business Plan

17 CHEMICAL IDENTIFICATION Material Safety Data Sheets, MSDS Chemical product and company ID Information on ingredients Hazards ID First aid measures Fire fighting measures Accidental release measures Handling and storage Exposure controls and PPE Physical and chemical properties Stability and reactivity

18 CHEMICAL HAZARDS & PPE CHEMICAL HAZARDS PPE Polymer (Anionic/Cationic) Eyes, Skin, Slip Hazard Eye protection, gloves, ventilation Iron Salts (Ferric) Inhalation, Eyes, Skin Eye/face protection, gloves, ventilation Chlorine/Sulfur Dioxide Sodium Hypochlorite/ Sodium Bisulfite Ammonia Alum Inhalation, Eyes, Skin, Ingestion Inhalation, Eyes, Skin, Ingestion Inhalation, Eyes, Skin, Ingestion Inhalation, Eyes, Skin, Ingestion Self Contained Breathing Apparatus, Level A Suit Eye/face protection, gloves, ventilation Eye/face protection, gloves, ventilation Eye/face protection, gloves

19 CHEMICAL REGULATIONS California Code of Regulations Title 8, Gen. Industry Safety Orders Title 19, Public Safety Title 27, Unified Hazardous Waste and Hazardous Materials Management Cal/EPA Local Fire Department (CUPA)

20 CHEMICAL REGULATIONS REGULATED Chlorine (Fed/State) Sulfur Dioxide (Fed/State) Ammonia, 20% (Fed/State) NON REGULATED Polymers Iron Salts (Ferric) Sodium Hypochlorite Sodium Bisulfite Aluminum Hydroxide Title 8, 5189, Appendix A: List of Acutely Hazardous Chemicals, Toxics, and Reactives Title 19, , Tables 1 and 3. Federal and State Regulated Substances List and Threshold Quantities

21 CHEMICAL REGULATIONS Regulations require critical information: Inventory of Hazardous Materials MSDS Development of Site Map Development of Emergency Response Plan Notification Hierarchy (internal and agency) Written Procedures for Response

22 CHEMICAL REGULATIONS Regulations require critical information: Development of Risk Management Plan Worst case release scenarios Sensitive receptors Dispersion modeling

23 CHEMICAL REGULATIONS Regulations require critical information: Development of Process Safety Management Plans Process Safety Information

24 CHEMICAL REGULATIONS Regulations require critical information: Hazardous Waste Operations and Emergency Response Training Program, HAZWOPER First Responder Awareness Operations Hazardous Materials Technician Incident Commander

25 FINAL REMARKS Deliveries Access Chemical Transfers and Spill Containment Storage volumes Chemical Compatibility Optimization and Dosage Reduction