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  • Users: arj00
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  1. arj00

    Waste disposal & treatment

    Thanks for all replies ,I like to add to my question the following: 1-The pumps are submersible pumps,they are large pumps 6 No. @1000GPM each. 2-I need to agitate the solids since if the pumps do not turn for 1 hour the sludge becomes very hard & the pumps will not work. 3-Actually I am...
  2. arj00

    Waste disposal & treatment

    Is it possible to provide air compressor in a seawge pumping station in order to pump compressed air into the wet well or this can cause serious troubles to the pumps since air bubbles may enter the pumps.
  3. arj00

    hydrology-Time of concentration for large watersheds

    I have used Kirpich formula for calculating the time of concentration for small watersheds,however for large watersheds it is giving conservative results"shorter duration " compared to other methods as the Kinematic wave equation which is developed by the University of Maryland & is recommended...
  4. arj00

    minimum slopes for water transmission lines

    What is the minimum acceptable slopes for large water transmission lines(dia. 60 inch),can we use 1 per thousand ? Is there any standard which give the minimum slope?
  5. arj00

    Sludge Drying & Incineration

    We have an existing STP with belt press (4 units) handling 63 mgd, the solids conentration after the belt press is 20%. We desire to incinerate the sludge: 1- Can we incinerate the sludge directly after the belt press or we have to dry it first & what are the recommended methods for drying &...
  6. arj00

    Water Flow Meters

    For large water pipes Dia. 40inch or above is it preferable to use electromagnetic flowmeters or ultrasonic flow meters & what are the advantages & disadvantages for each type.
  7. arj00

    Area Required for Waste Water Treatment

    The Municipality has to allocate a new site for a tertiary treatment activated sludge to handle 1 million m3/day (264 million gallons/day). What is the minimum area needed to provide tertiary treatment for such a plant including sludge treatment.
  8. arj00

    Storm water ventilation

    Recently a new storm water system has been constructed in a flat city with big diameters(Dia. range 1meter-2.5 meters), last week there was a big storm and we noticed there are a lot of air coming from the Manholes ,so we opened several manholes to relief all the air from the system. Some...
  9. arj00

    water distribution

    Are there any standards regarding the maximum water velocity that can be reached in water transmission /distribution lines for the following pipe materials: 1-Ductile iron cement lined 2- concrete pressure pipes 3- Steel pipes
  10. arj00

    Water treatment & distribution

    Thanks for all the replies. As I stated I need to start on this subject & mainly how to operate the system (Tanks,wells,pumping stations,main valves,etc..)on & off switches ,I heard of SACDA software how can I get more information about it,are there better software.I know there are a lot of...
  11. arj00

    Water treatment & distribution

    Most of my work is in the design of water distribution systems,tanks & pump stations. Several new projects the client is asking to involve more in operation & maintenance of the system ,so I need some information,software or references which I can refer to & see how I can advise my Client...
  12. arj00

    water distribution pipe material

    What pipe material is preferable to use for water transmission line Dia. range 10inch- 16 inch. Ductile iron is costly,GRP(glass reinforced plastic) is less costly but I did not use before! Do you think GRP is acceptable .
  13. arj00

    water consumption per capita

    I have to estimate the future water demands for a large city in the middle east where the water is scarce,the current demand is only 220 liters per capita per day,some views suggest to increase the demand to reach 350 liters per capita per day and some views want to keep the demand fixed in the...

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