This section provides a quick preview of questions from the document. It may not display every question or the complete wording of each one. For the full content, including diagrams, tables and other information, view the original PDF above.
Q1— Section header —
1.1Electrical potential is a derived unit measured in siemens.
1.2Concentration in water treatment plants is expressed as mass per volume.
1.3Pitting corrosion occurs once the protective film or corrosion layers break down.
1.4
1.510
Q2— Section header —
2.5\in the ANSWER BOOK. COLUMN COLUMN .1 .2
2.5A valve that opens automatically when the pressure builds up to a dangerous level Water that penetrates the soil directly The chemical symbol for chlorine They are used as a means of access for inspection
Q3— Section header —
3.1Convert the following:
3.1.3
3.2
3.3Calculate the volume of a cylindrical biological filter with a diameter of 8 m and a height of 2,35 m. (5\
3.4The flow of a fluid in a pipe can be calculated by the formula below: Q = x A What is the meaning of each symbol (include units of each\ (6\ [22]22
Q4— Section header —
4.1Name and provide a brief description of any THREE zones that exist in the self purification process of rivers, dams or streams.
4.2Briefly explain the purpose of the following in the waste water treatment plant
4.2.1An emergency bypass
4.2.2Storm water overflow
4.2.3Distribution balancing system
4.2.4
4.3The main purpose of screens is to remove debris, rags, papers etc. Indicate THREE problems that may be experienced with screens. (3\
4.4Name FOUR types of sedimentation tanks. (4\ [21] 812000321
Q5— Section header —
5.1Indicate whether the following statements are TRUE or FALSE. Choose the answer and write only ' rue' or ' alse' next to the question number (5.1.1
5.1.10\n the ANSWER BOOK.
5.1.1Purging of a sand filter bed in a water treatment plant, is necessary to maintain voids for passage of waste water and air.
5.1.2The media of a filter must be flat to allow bacterial growth on it.
5.1.3A percolating filter is an open structure with a graded floor.
5.1.4The biological layer is anaerobic at the bottom.
5.1.5The majority of COD is extracted in the upper part of the filter.
5.1.6Hydraulic load is expressed as m of sewage per day per m of sewage per m filter media per day.
5.1.7Organic load is the O absorbed in grams per m of filter media per day.
5.1.8It is good for the filter to stand dry for extended periods to prevent bad smells.
5.1.9Relative stability tests are performed on effluents prior to biological filtration.
5.1.10
5.2Calculate the hydraulic load of a biofilter if the filter is 200 m /d and the surface area of the filter is 100 m
5.3Draw a flow diagram illustrating the double filtration process. (5\
5.4Explain the purpose of the bottom zone of a biofilter. (2\
5.5What is a standard set for suspended solids for biofilter efficiency? (1\ [21] 812000321
Q6— Section header —
6.1What actions should be taken when dealing with chlorine gas during an emergency situation (7\
6.2Name THREE types of records that must be kept in the chlorine dosing room. (3\
6.3State FIVE advantages of removing phosphate by chemical addition in the activated sludge process.
6.4Describe the following processes
6.4.1Reclamation
6.4.2
6.5Provide the temperature range at which the following digestion processes take place.
6.5.1Thermophilic digestion
6.5.221