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Ambassador report

[Ambassador report] Solid Waste Management in Kisumu County

by Okoth Okoth | 17-01-2021 14:46 Comments 4 Comments recommendations 0 recommendations



LIQUID WASTE MANAGEMENT
This refers to the procedures and practices to prevent discharge of pollutants to the storm drain system or to watercourses as a result of the creation, collection and disposal of hazardous and non-hazardous liquid materials.
The sources of liquid waste in the city are industries, the airport and residential areas. There is one treatment plant serving the city; KIWASCO in Kisat.
Waste water types produced at the town include sullage and gray water.
The following are the definitions of commonly used terms in LWM
Soil water: waste water containing fecal matter
Grey water: waste water from kitchen, sinks, bathroom, laundry room that do not contain fecal matter.
Sewage: liquid waste containing suspended, colloidal and dissolves solids.
Sewer: a pipe conduit which carries sewage
Sewerage: network of sewers or pipes that are used for the purpose of transporting sewage.
Waste treatment: chain of treatment operations which reduce the volume and strength after which it renders the waste harmless and suitable for disposal.
Raw waste: untreated waste which is in a fresh state.
Sullage: same as grey water it refers to wastes flowing from the kitchen and bathroom
The soil water from the aforementioned facilities consists of potentially dangerous organisms that can cause the occurrence of water borne diseases like cholera, dysentery and typhoid. The organic content of these wastes is putriscible in nature and undergoes decomposition leading to emanation of obnoxious gases. 
Grey water is released from kitchens, bathrooms, laundry rooms and from wash hand basins while soil water is released from the water closets and urinals it contains fecal matter and urine. Sewerage system being used is the combined system whereby sanitary sewage and storm water are carried in a single sewer. Sewer Appurtenances include manholes, inspection chambers, grease traps, water closets, flushing tanks, urinals.

2.11.1 System Plumbing
Three types of plumbing system for drainage of facilities exist: two pipe system, one pipe system and single stack system. For one pipe system, there is one main pipe that collects both sullage and grey water from sinks, bathrooms and water closets then convey them to the building drain which joins the city drain but for two pipe system, there are two main pipes one for sullage the other for soil.
Reasons for waste water treatment:
To prevent ground water contamination
To prevent soil pollution
To protect aquatic life
To ensure re-use the treated effluent
To solve social problems caused by accumulation of waste water.

2.11.2 Treatment process 
2.11.2.1 Preliminary treatment
It involves the removal of waste water constituents that may cause maintenance or operational problems with the treatment operations, processes and systems. They include:
Screening
Comminuting- for removal of debris or rags
Grit removal- elimination of coarse suspended matter
Skimming- for removal of large quantities of oil and grease
2.11.2.2 Primary treatment
Done in the primary sedimentation tanks which are four in number. At this stage, a portion of suspended solids and organic matter is removed. This is done through physical operations such as:
Floatation
Sedimentation
Sludge is removed using a clarifier.
     Biological filtration
Nitrates, phosphates and ammonia are broken down by aerobic microorganisms at the top and anaerobic microorganisms at the bottom.
2.11.2.3 Secondary treatment
Here, sludge is further removed in the secondary sedimentation tanks which are also four in number. The retention period is 3hrs per tank.
 The final effluent is released into River Kisat which flows into L. Victoria.

4 Comments

Asmita Gaire

  • Asmita Gaire says :
    Greetings okoth
    I hope you are doing well
    Thank you so much for this report
    Keep writing
    Green cheers
    Regards
    Asmita Gaire
    Posted 13-02-2021 14:41

Mun WooJooMentor

  • Mun WooJooMentor says :
    Hello Okoth,
    this is your mentor WooJoo.

    Warm greetings from South Korea.
    Thank you for sharing such an informative report regarding the Liquid waste management in in Kisumu County.
    Your report provided us the opportunity to know detailed definitions and processes for waste treatment.
    It is helpful that you introduced us the treatment system in order, but it would be better if you added reasons why you selected the topic, or photos since there are many separation techniques related to engineering.
    Also, it would be nice to show its effectiveness by numerical data, for better understanding.
    I would like to know more about what the impact of liquid waste on impact is, and why it is important.

    Please remeber to add your references in the reports.

    Regards,
    WooJoo


    Posted 20-01-2021 20:04

SJ Mentor

  • SJ Mentor says :
    Hello Okoth!
    It's your SJ mentor.

    Warm greetings from Korea!
    Thank you for writing a report introducing the wastewater treatment process.
    I think the title should be changed to liquid waste treatment, not solid, right?
    I have studied the wastewater treatment process while learning environmental engineering, and it is similar to the process you introduced.
    However, it would be easier to understand if containing photos which demonstrate the process actually flows.
    If you used the reference, please remark the source.
    Hope things are fine with you.
    Keep writing!

    Best regards,
    SJ mentor.
    Posted 18-01-2021 05:53

Shobha Pokhrel

  • Shobha Pokhrel says :
    Very Informative report

    keep sharing

    warm Regards , Shobha
    Posted 17-01-2021 17:25

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