Lime softening - Study guides, Class notes & Summaries

Texas Class D Water License Test (2024) || All Questions & Solutions (Graded A+) Texas Class D Water License Test (2024) || All Questions & Solutions (Graded A+) What removes tastes, odors, and certain organics and gases, and oxidizes iron and manganese? This process includes the incorporation of air into the water by means of spray nozzles , steps or cascades, or trays of diffusers? - ANSWER - Aeration TCEQ regulation states that Shore installations , marinas, boats and houses on the wat...

When pressure testing a new line, how much pressure do you add? - 1.5 times normal pressure, up to 150 pounds, whichever is greater What would cause a repeat Bac-T sample? - Incomplete form, not enough sample, silt or slime in the bottle, positive e-coli, all of the above What are the layers of stratification? - Upper layer - Epilimnion. Middle layer - Thermocline. Bottom Layer - Hypolimnion. What standard must bleach meet? - NSF (National Sanitation Foundation) What is the Solid con...

Which disinfectant would work best against cryptosporidium ozone dichloramine hypochlorite ion hypochlorous ion ozone The pH of a water sample is greater than the pHs, so the Langelier index? indicates the water is corrosive is negative indicates the water is scale forming indicates the water is stable indicates the water is scale forming When water high in calcium bicarbonate is softened by ion exchange all cations and anions are removed regeneration is usually accomplished by an ...

Power Engineering 4B Review Questions with complete 2024/2025 Power Engineering 4B Review d A treatment method that is often used in conjunction with settling tanks is a) Zeolite softening b) De-Mineralizing c) Lime soda softening d) Filtration b A stem engines

Which disinfectant would work best against cryptosporidium? - ️️Ozone The pH of a water sample is greater that the pHs so the Langlier index? - ️️Indicates the water is scale forming. When water high in calcium bicarbonate is softened by ion exchange - ️️Sodium bicarbonate remains in the product water. Lime softening can effectively disinfect water because: - ️️The pH level is higher than 10.5 A noncarbonate hardness compound is - ️️MgSO4 What term refers to th...

Which disinfectant would work best against cryptosporidium? - Ozone The pH of a water sample is greater that the pHs so the Langlier index? - Indicates the water is scale forming. When water high in calcium bicarbonate is softened by ion exchange - Sodium bicarbonate remains in the product water. Lime softening can effectively disinfect water because: - The pH level is higher than 10.5 A noncarbonate hardness compound is - MgSO4 What term refers to the reintroduction of carbon dioxide int...

Water Treatment AWWA Questions Grades 1 and 2. Treatment Process Questions and Answers 100% correct What must the effluent NTU for a slow sand filter be kept at during operation? Less than 1.0 NTU When water is added too fast to this treatment chemical, it will generate heat and splattering of the chemical. Sulfuric acid In the lime-softening process, besides CaCO3 being precipitated, what other carbonate hardness chemical is precipitated? Magnesium hydroxide Dry alum ha...

What is the purpose of adding Carbon Dioxide to Softened water? - ANSWER-Restores the Carbonate Balance. How is lime sludge dewatered? - ANSWER-By Solar Lagoons How can Non-Carbonate Hardness be achieved? - ANSWER-By Sodium Carbonate, Ion Exchange, Membrane Separation, Sodium Hydroxide. What is Selective Carbonate Removal? - ANSWER-Removal of Calcium Bicarbonate Hardness at PH of 9.6. Noncarbonate hardness present in water means? - ANSWER-The Total Hardness is greater than the Total ...

REHS Exam Questions with Complete Solutions | 2024 Which of the following organisms are most resistant to unfavorable environmental conditions and indicate past of possibly intermittent pollution? a. fecal streptococci b. eschericha coli c. aerobacter aerogenes d. clostridium sporulates - Answer️️ -clostridium sporulates The presence of which of the following is most easily identified by laboratory analysis in water contaminated by feces? a. shigella dysenteriae b. coliform c. en...

ENCN281 Test Questions & Answers 2024/2025 Normality - ANSWERSmass/volume = eq/L EW - ANSWERSMW/Z - [C] = EW*N, N1V1=N2V2 Z value - ANSWERSAcids and Bases: Stoichiometric coefficent Salts: Charge pH - ANSWERS-log[H+] Alkalinity measurement - ANSWERSAlk(mg/L as CaCO3) = (A*N/mL sample) * 50000 Water Softening - ANSWERS- removal of calcium via precipitation as CaCo3 - addition of lime (Ca(OH)2) Alkalinity Curve - ANSWERS- Exponential flattens: Adding acid but pH stable, b...