TEXAS Wastewater Class B Exam - Complete Solutions (Answered) Before entering a manhole the operator should test for ________and oxygen levels and
... [Show More] ________the manhole before entering. all hazardous gasses and ventilate When a municipal wastewater effluent has a high nitrate level and low ammonia level this most likely means the effluent has received a high degree of aerobic treatment Total solids in wastewater are the sum of Settleable and volatile solids This treatment device is commonly used to separate and remove large solids from raw wastewater A Mechanically raked bar screen ___________would have an adverse effect on the proper settling of solids in a clarifier. A short circuiting flow pattern This test would give the best information on how efficiently a trickling filter was operating Percent BOD Removal This trickling filter problem could be reduced by increasing the recirculation ratio Filter files What gases are produced by the controlled anaerobic digestion of wastewater sludge's Methane & Carbon Dioxide These diseases are caused by pathogenic organisms that may be present in raw wastewater Hepatitis, typhoid, paratyphoid,dysentery, cholera, gastroenteritis, polio, hookworm and giardiasis During heavy rain it is possible that manholes and lift stations may overflow, discharge waste materials into roadways or ditches. This type of discharge (SSO) would be considered an unavoidable discharge, a violation of the Texas Water Code, a bypass that must be reported within 24 hours and considered a health hazard An effective way for the collection system worker to prevent infection by waterborn pathogenic organism is to Wear protective clothing and avoid direct contact with waste water _________will increase the chances that sewage will turn septic
Stoppages in the main line Extensive use of garbage disposals (grinders) in a community would likely have the following effect on the collection system Increase the amount of flow, solids, and grease The minimum size for a gravity flow sewer line on city right-of-way and the minimum grade is 6 inch and a grade of 0.50 percent The most accurate way to find the average wastewater flow rate in an existing 10-inch sewer main is Obtaining actual flow data & verifying with field data What is the greatest advantage for using fiberglass manholes in areas with high groundwater? fiberglass is not subject to infiltration A __________ pump would most likely be used when discharging into a 10" diameter pressure sewer main. Centrifugal Excessive power consumption by a pump could be caused by Worn bearings and worn impeller Trench safety is a great concern in Texas. OSHA requires that anytime an excavation is greater than __ feet deep it must be protected by ______. 5 feet / An approved Trench Box, Shoring, or Sloping In an excavation if a ladder is used as a means of exit, it must extend ________feet above the ground and be secured and within ____ feet laterally of anyone in the excavation. 3 feet / 25 feet laterally A ____________ would be the best to determine if a storm drain is connected to a sanitary sewer line. Smoke Test _________ would most commonly be used to seal a number of joint leaks on a main with minimal interruption internal grouting Pre-treatment of wastewater would include: Coarse or fine screening, grinding and grit removal and grease removal and pre-aeration [Show Less]