School Sewage treatment plant

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Can anybody out there with expertise in the design a small foot  print of a school sewage treatment plant get in touch.

Do advise on the information you require. Currently the school is using long drop pits ( latrines) which get filled frequently emitting an offensive stench which must be gotten rid off.

Do get in touch with us through wemcons@gmail.com

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12 Answers

  1. All sewage treatment plants have same basic design.Here the question is whether the school is having a laboratory?It is better to contact local water treatment company for a package STP.

  2. The latrine has nothing to do with the pit it is the place of defecation often described by a cabin with a door ensuring the privacy of the person in the hope of relieving himself.
    a latrine is placed on the ground and a hole connecting it to a tank allows the evacuation of excrements. These are stored in the tank where they enter into puytrifaction from where the release of foul odors. when the tank is full, it is emptied and its contents are poured into the surrounding environment, or onto land reserved for this purpose. One wonders what is the point of storing excrement and ultimately returning it to the environment as it is certain that this will be the case.
    In your case, your system includes several pits connected one after the other and which are filled by gravity flow.
    This device allows to store more excrements but by negative effect produces many more putrid odors.
    - Either you set up what the market has available (septic tank therefore essentially the same device)
    - Either you set up what the market has available (a treatment plant, which is the same as the septic tank and more expensive
    - Either you can set up a biotechnology
    What sets them apart
    - The 1st system stores part of the excreta and disperses a good part of it in the environment without definitively eliminating them
    - the 2nd system passes all the excrements to disperse them entirely in the environment without definitively eliminating them
    - Biotechnology does not store excreta, does not transport them to reject them as such in the environment, it globally and definitively eliminates all excreta while not releasing any pestilential odor. the liquid at the outlet waters any nearby green space.

  3. There are several causes of unpleasant odour from the Toilet  are :

    • Poor airflow & ventilation
    • Choked or clogged pipe -
    • Bad habits of toilet users -
    • Lack of cleaning facilities provided -

    The above conditions cause an unpleasant odour in the Toilet,

    However to do new ones or new design for better Toilet could you please provide us

     

    The information :

    1. How many person using the toilet
    2. Is the existing  sewerage system type for Mix system ( black water and grey water ) together disposal in to Pit latraine?
    3. How far the Septic tank from the Schooll
    4. Is there underground tank  ( is there any specific treatment, if have an existing drawing can you email )
    5. Is the toilet using water for flushing and washing or using toilet tissue?
    6. Is there discharge flow from Septic tank to the drainage or Canal?
    7. How many square m2  the area of Toilet? Do you have more space area if there need  modification
    8. Is there routine maintenance to take sludge every year? When is the last time collecting sludge and disposal to the Sewerage system Plant or Fecal sludge treatment?
    9. Do you think better building new system toilet or modification existing toilet?
    10. Is there enough budget to make a new system school toilet?

     

    Above is several investigate to develop better toilet, and please let me know if you need help from me, I can design better  Sewerage or Fecal sludge treatment for the school.

     

    Best regards

     

    Tris Hardyanto

    Wastewater-Fecal Sludge and Sanitation Specialist

    +880-1308-373389 ( Bangladesh)

    +62-811146052 ( Indonesia)

  4. To be honest, there's a some bad advice in this thread. If something sounds too good to be true, it is. Here's my thoughts. 

    The immediate questions that I think of are how much treatment do you need? Are you just looking to control odor or also remove nutrient from the wastewater? Where are you discharging the wastewater to? How many people is the system serving? What discharge regulations do you have to follow? What's your budget? What country / location is this located in?

    While SBR's and MBBR's are great technologies, they're very advanced pieces of technology that can be difficult to operate. They're likely not a feasible option for your application due to high costs, needing skilled operators, etc (although I could be wrong here.) 

    A couple people in this thread are saying that they have a biological treatment system that doesn't produce sludge. They are wrong. While there are technologies that reduce the amount of nutrient you convert to excess solids by either controlling the f/m ratio or encouraging endogenous decay (and there are other encouraging electrochemical or thermal processes being studied), it is literally impossible to not produce sludge from a biological treatment process. Since sludge isn't 100% volatile, you will always have some sludge that needs to be managed. Any product that claims something different is claiming to violate the conservation of mass - one of the most basic laws of physics. 2+2 will never equal 3 unless there's some funny math going on. If anyone did invent a commercially viable biological wastewater treatment system with no sludge generation, that company would immediately become the largest wastewater company in the world.

    Finally, some people in this thread have recommended packaged plants. A packaged plant might end up being your best solution depending on the answer to my questions above. 

     

    So, with that being said, my *GUESS* is that your best option is going to be one of four things:

    1. A wastewater lagoon. These are commonly used around the world, and you can help prevent odor by maintaining oxic conditions. There's a few ways to maintain oxic conditions whether that be related to lagoon design (ensuring it's shallow and lightly loaded), equipment (various types of aerators), or using algae to provide oxygen. 

    2. A septic system (depending on the number of students)

    3. An anaerobic baffled reactor (which is substantially similar to a septic system, but can built for more students). You could use a soak pit or something like that in combination with the ABR. You can read about that here from this World Health Organization pamphlet: https://www.who.int/docs/default-source/wash-documents/sanitation/sanitation-system-fact-sheets/fact-sheet-7---flush-toilet-with-septic-tank-and-effluent-infiltration-and-offsite-faecal-sludge-treatment.pdf 

    4. A packaged plant like others have suggested

    Answered on by

  5. Look at our website: www.globalwater.com. We have been manufacturing water and wastewater/recycling systems for the U.S. Special Forces for 31 years! Our wastewater systems are better than any SBR, MBR or anything else. Our wastewater systems eliminate all organic sludge: there is NO SLUDGE to remove; and the effluent is 100% re-usable and can be potable! My email is amweiss@globalwater.com.

    Answered on by

  6. Peter,

    Depending upon space and budget we can offer a few alternatives for you:

    1-SBR system (Sequential Batch Reactor (SBR) Wastewater Treatment Systems (solutionsrecovery.com). This system requires some civil and structural work and it has a small footprint. However, it requires air sparges, blowers, and a PLC-based controller.

    2-Sludge Buster (Sludge Buster (solutionsrecovery.com). This system can work in a pond if you already have s pond that you are storing the wastewater. It only has a 2HP motor and that is all your need for installation and it is much cheaper than SBR. The advantage of this technology is that it get if of the smell in the first few weeks and since it contains facultative bacteria, it does not generate sludge, which is another item that is required for SBR technology. We can also combine the SBR and sludge buster or retrofit an existing SBR system.

    We can design a system for you, if you give us the number of people in the school and annual rain in the location this system will go in. 

  8. Where are you located? You can treat succesfull small waste water volume using a SBR system ... it’s very simple, robust, cheap with good result

  9. Westech Engineering has a simple packaged plant to handle this very thing. We had looked into buying one to replace an older wastewater plant with a trickling filter.  We never purchased the old plant so we never purchased the new unit. Inexpensive and easy to setup. Give it a look.

  11. Hi Peter,

    The water network is a great site to get ideas. Initially, to ward off the smell you can add a ventilation pipe and additives as mentioned in the link. 

    https://forum.susana.org/forum/categories/280-faecal-sludge-treatment/1002-additives-for-pits-septic-tanks-lagoons-faecal-sludge-includes-em#1002

    https://forum.susana.org/forum/categories/septic-tanks/4085-on-site-sanitation-based-on-bio-additives-and-pit-design-lsth-uk-and-tanzania-south-africa-and-vietnam#4085

    To help me more accurately, it will be good to post some basic data and pictures:

    1. Location of the school - country, region, urban/rural, gis data, any data on location helps to plan things. Water level, usage of water, anal cleansing material etc. Availability of electricity etc. 

    2. How many students and teachers in the school; duration of operations in the school; is the school building used as any other facility like evening vocation training institute etc...?

    3. What is the expected budget you have?

    4. Any picture of the existing facility? 

    Regards