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Municipal Water

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Submitted By ochibo
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MUNICIPAL WASTE WATER
Sources of municipal waste water 1. Domestic waste watera person uses about 60 gallons/day. 2. Industrial waste watercontain contaminant and must be treated before going to the treatment facility 3. Storm run-offNo problem with low to moderate flow. Tx plants cannot handle high flow, so they discharge the excess water to streams and oceans. This is called combined sewer outflow/overflow.

Contaminants of Concern 1. Suspended solidscan kill bottom dwellers/organisms. Absorbed into facilities 2. Biochemical Oxygen Demand (BOD) The amount of oxygen that is lost over a defined period of test. It tells you how much oxygen is present in the water and can be consumed by organisms. The goal is to have a low BOD. A high BOD means that a lot of organic matter in the water are decomposed by microorganisms.
Sewage tx plants require industries to meet their BOD before they discharge their water into the plant. 3. PathogenUse mainly E. coli. A sign of fecal contamination. Simple to measure and analyze. 4. Toxic Chemicals: * Metals from pipes that run within industries * Organics such as pesticides, LMPAH, HMPAH * Emerging contaminants it is only recently that it has been possible to measure these. Mainly pharmaceuticals (ibuprofen, triclosan) 5. Nutrientsexcess nutrients stimulate phytoplankton growth. Other factors are light, micronutrients (thiamin, biotin), and Macronutrients (Non-limiting: Ca,C, K, and Limiting: N2 and P)

Effects of excess growth a. Decreased DO and this kills fish b. Excessive growth of algae c. Growth of phytoplankton that cause disease (red tide, diarrhetic shellfish poisoning)

Hypernutrificationthe levels of nutrients increase due to anthropogenic input
Eunitrificationincreased levels of nutrients through biological means

Treatment done at Publicly Owned Treatment

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