To be honest, there's a some ...

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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