Why don't garbage trucks grind garbage?

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In summary: I imagine the landfill would be much more efficiently utilised in this scenario, as there would be hardly any air and wasted space within the garbage slurry. The garbage may also decay more quickly when thoroughly mixed as a thick slurry.In summary, the author thinks that if garbage trucks ground their garbage instead of compressing it, they would be able to carry much more on a single route and the garbage would be easier to handle and landfill logistics would be easier. There may be an increase in the amount of seepage into the water supply, but the trucks would still be very loud.
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Strange question, i know. I didn't really know where to put it.

Why don't garbage trucks grind their garbage instead of simply compacting it? There's plenty of shaft power available in the truck to reduce the garbage into a reasonably fine consistency.

This would allow the trucks to carry much more garbage on a single route and would also facilitate easier handling and landfill logistics. The garbage could be mixed with water to form a slurry and simply pumped into landfill instead of having to be laboriously moved using bobcat-like machinery.

I imagine the landfill would be much more efficiently utilised in this scenario, as there would be hardly any air and wasted space within the garbage slurry. The garbage may also decay more quickly when thoroughly mixed as a thick slurry.

There may also be scope for sorting useful materials from the ground garbage (pre slurry) using some mass dependent hydrodynamic or aerodynamic process and appropriate filter membranes. (Perhaps the garbage could be blown around a bend with high velocity air, with different catchment receptacles for flung particles of varying mass)

Just a random thought.
 
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One problem i could see is an increase in the amount of seepage into the water supply.
 
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When your garbage goes to a landfill, it goes through a special machine that separates out food wastes from plastics and metals. Some of the materials are then redirecting into the recycling streams.

If you ground it all up together in the truck, you'd no longer be able to reclaim any of it at all.

- Warren
 
  • #4
chroot said:
When your garbage goes to a landfill, it goes through a special machine that separates out food wastes from plastics and metals. Some of the materials are then redirecting into the recycling streams.

Really? I doubt that is common.

It's kind of an engineering question, right? A fairly average piece of garbage is something like, perhaps, a cardboard milk carton. There's likely to be a lot of empty space inside that kind of thing, and it won't take so much effort to crumple it down. If you first ground it up, then compacted it down, you still wouldn't get the milk carton much smaller still, but you would need far more energy for tearing it apart. Diminishing returns. Also, the mechanics of a compactor can be hardy, regardless of what type of garbage you have. But imagine the difficulty of maintaining a grinder, which doesn't jam or blunt on paper, doesn't get gummed up by banana peel and plastic bags, but can still grind apart glass and metal efficiently? Wouldn't it be made of sharp edges, that quickly wear down and need servicing? I'd say those trucks don't grind for the same reason they don't atomise..
 
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You don't necessarily need sharp edges if you have an abundance of power.

It turns out the idea was toyed with in Germany at some stage. It was unpopular due to the increased fuel consumption of the trucks. I guess the extra fuel that is used is more expensive than the landfill savings and the cost of a bobcat jockey.
 
  • #6
If you live in an area that has a "transfer station" as opposed to a "landfill" then the separation process that Chroot mentions is going on right there.

Other than that, plus the fuel consuption, those trucks already make the goddamdest noise! You want them grinding the garbage at 6 in the morning too?
 
  • #7
My garbage pickup happens late in the afternoon :)
 
  • #8
I would think that there would be a limit to the tonnage a truck would carry.
 
  • #9
Chi Meson said:
If you live in an area that has a "transfer station" as opposed to a "landfill" then the separation process that Chroot mentions is going on right there.

you really see the phrase "one man's trash is another man's treasure" in full effect at transfer stations. Very popular in Alaska. I have friends who's assets are practically made up of transfer station scores.
 
  • #10
Not to mention some people throw out hazardous materials, and grinding a hazmat could contaminate the surrounding environment, not to mention medical waste garbage, explosive, flammable liquids, reactive chemicals with other garbage (ammonia + bleach anyone?), sometimes corpses end up in the garbage truck and it becomes a crime scene which you won't want to destroy
 
  • #11
^

Each one of those is reason enough.
 

Why don't garbage trucks grind garbage?

1. What is the purpose of garbage trucks if they don't grind garbage?

Garbage trucks serve the purpose of collecting and transporting waste from homes and businesses to designated disposal sites. The grinding of garbage is not necessary for this process.

Why don't garbage trucks have grinders?

2. Is it more efficient to grind garbage before disposing of it?

Grinding garbage before disposing of it is not more efficient. In fact, it can be more costly and time-consuming as it requires additional equipment, maintenance, and fuel for the garbage trucks.

Why can't garbage trucks grind all types of garbage?

3. Are there any limitations to what garbage trucks can grind?

Garbage trucks are designed to collect and transport solid waste, such as household and commercial waste. They are not equipped to grind hazardous or liquid waste, which require specialized disposal methods.

Why don't all cities use garbage trucks with grinders?

4. Are there any drawbacks to using garbage trucks with grinders?

There are several drawbacks to using garbage trucks with grinders. They are more expensive to purchase and maintain, require additional training for operators, and can create noise and air pollution.

Why are garbage trucks without grinders still effective?

5. How do garbage trucks without grinders dispose of waste effectively?

Garbage trucks without grinders are still effective in collecting and transporting waste to designated disposal sites. These sites have processes in place, such as compacting and burying, to properly dispose of the waste collected by garbage trucks.

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