Most properly sized and installed septic tanks do not ever need to be pumped out. They compost on their own and the excess water seeps out underground.
Actually, a proper septic tank (according to EU regulations) has to be water-tight and be emptied regularly.
Many beaches on the Mediterranean loose their health pass occasionally due to nearby overbuilding and improper septic tanks.
That's not a "proper" septic tank. That's just a holding tank. The word 'septic' alludes to the fact that you are promoting putrefaction to decompose the contents.
RVs have holding tanks that must be emptied. Thus, they aren't called "septic tanks".
However, if the system isn't maintained it often needs replaced at a large expense. Most homeowners don't know how to inspect and don't bother to hire someone knowledgeable.
Our local township has an ordinance where every residential sewage system (10k residents, not sure how many systems that is) has to be pumped out and inspected by a certified sewage hauler. This way, the homeowner knows about and is required to make simple repairs before the entire system fails.
this was contrary to my city-dweller's understanding, so i did some quick wiki-reading and it seems like the reality is somewhere between you and GP's statement? i.e. they do biodegrade waste via anaerobic bacteria, but non-degradable sludge has to get pumped out every few years.
Your city dweller’s habits compel you to throw fat and oil down the drain. These need very high temperature to compost. But then you are also throwing chlorine and ammonia based cleaning agents, which greatly inhibits organic life.
If you let the fat and oil solidify at room temp and dispose of them in the trash, and if you use regular soap in the recommended amount, and if you septic tank additive once in a while, you will be tearing the problem at the source, and will only need to take care of the tank when it’s time to replace it in 40 years.
This is why you see a jar full of bacon fat and the like in lots of rural homes. They aren't saving it to cook with, they are collecting it to throw out with the trash instead of sludging up the drain and septic system. People are much more careful about what they flush down the drain when they know they will be responsible to fix it if they cause issues.
For the apocalyptic end results of lots of city dwellers flushing non-biodegradables down the drain, Google "fatberg" - only if you have a strong stomach.
It depends on how the tank is setup and the drainage system it has.
Septic tanks are not closed systems they are open and intended to provide an environment that can produce a bio-reactor while maintaining drainage through the soil.
Many good systems don’t need to be drained other than every few decades in fact good systems would outlast the tank and the filtering substrate it’s built on so when the time comes you need to dig out the tank and the gravel and other filtering particulate it used because that is what has degraded.
The problem with septic tanks is that they don’t scale we’ll have one on a large property in the middle no where that 5 people use and it’s a great solution have a bunch of them and worse over use one in particular and you get a polluting mess.
But septic tanks also don’t solve the other problem with western toilets and that is the amount of water they consume which is simply unfeasible for many developing regions.
TLDR; if the septic tank was installed and sized correctly it will outlast you even without pumping it, but it’s not a solution the reason we don’t use them in cities is because they don’t and can’t scale with urban population densities.
Also, some US states are encountering issues with bio contamination in their aquifers and as water issues become more prevalent (perennial droughts in some states shrinking aquifers making them less resilient to contamination; perennial flooding in others moving the water tables closer to septic tanks and making them more prone to contamination), the requirements to isolate septic tanks from local ecologies will only grow (ie, increasingly more counties will require to close them, watertight protect them, require them to be regularly pumped moving forward, and/or replace them with a connection to nearby sewage systems).
Yes the ground water level, soil permutability, distance to water sources etc. has a lot of implications on what sceptic system you can implement and I would bet that many tanks are put in without much regulation or oversight.
Other areas like those in which ground temperatures drop below freezing for long period of time might also require tight tanks and constant pumping since the cold may stop the reaction in the tank so it would surprise me if tanks in places like say N. Dakota would be pumped year before winter to prevent them from freezing shut and overflowing.
Septic tank owner here. I own a single family home, maybe larger setups are different. The recommendation from the installer is that it is pumped and inspected every 3-4 years.
> The recommendation from the installer is that it is pumped and inspected every 3-4 years.
That sounds about right if the goal is to keep a system that's not properly functioning (not enough microbes to break down solids) from filling up to the point of causing problems. You won't go wrong if you follow that advice but depending on what goes into your septic (do you have a garbage disposal, do you do laundry with bleach, number of people in household, etc) you may be able to go an order of magnitude longer. Recommending a system be pumped every 3-4yr is like a 3k oil change, it's excessive in the overwhelming majority of use cases but it will make more money for whoever does the work and not cause a system to fail in a way that comes back to bite whoever installed it.
The manual for the original Nintendo Entertainment System said "Do not operate continuously for more than 15 minutes."
Sometimes legal departments force them to include those recommendations in order to err on the side of "absurdly overcautious." And sometimes the recommendations are merely prudent! I'm not saying you can wait longer, just that installers may have a motivation to exaggerate.
But unlike an NES system, if your septic tank develops a problem you now have liquid and solid waste flooding your yard and home, and your toilets, sinks, and showers are useless until it's fixed.
I feel like the failure mode for electronics is "randomly catches on fire" which can be just as devastating, if not moreso. Nobody has ever died because their toilet backed up. Their house burning down in the middle of the night is a different story.
My grandparents had there's installed in 1983. I think it was a somewhere between 700-1000 gallons. The toilets finally stopped flushing properly in 2010. It was because the tank was completely full of sludge. They got it pumped, and I guess it'll go another 20+ years now...
The issue comes down to cost. As he mentions in the article, the goal is to get to 5 cents a day. Just a basic calculation, a “standard” septic system costs between $1500-4000 to install, and lasts roughly 25 years. Just doing the math on the low end costs brings you to about $0.16 cents a day, 3X the goal Bill Gates is advocating.
Note: this isn’t even taking into account the cost of the toilet itself or any plumbing needed.
Really all you'd need to do to drastically improve things is get them to simply dig a hole for an outhouse instead of the rampant open defecation seen in India and some parts of Africa. We can solve the more complex and exponentially expensive problems of water treatment later. Digging a deep hole gets rid of rampant cholera and incidental exposure.
Basically you've got to learn to crawl before you can run a 10k.
edit: You can get someone who is completely illiterate and cut off from civilization to understand the concept of digging a hole for the shit to go in. This has the added benefit of not requiring advanced manufacturing technology or materials. they just have to dig a hole and move the outhouse top over to the new hole when the old one gets full. This makes them self reliant.
Digging a hole is more challenging than you think.
It has to be deep enough, and far enough away from a home, road, water source, food supply, etc. Not all communities have a lot of extra land, so you're talking one or two communal toilets, which need to be large to support a large population, and someone has to maintain them.
If you have the land, you have to have money to construct them, as well as labor. Many households can't afford the $1 (that's one US dollar) construction cost, or the household simply can't perform the labor. In some cases, villages will come together to help fund and construct pit latrines, but these are the exception. Most just put up with the shame and disease of open defecation.
Once you do have them, you have cultural issues like India's manual scavenging problem (http://www.thealternative.in/society/manual-scavenging-thoug...) not to mention you literally have to go out and inform millions of tiny remote villages about why and how to change. It's very hard to get people to change.
Assuming outreach of one week per village, for the 600K censused villages in India, that's 11,506 years to just inform and convince them all to build pit latrines. Even 50 outreach teams would take 250 years. With 500 teams you can cut it down to 23 years.
>It has to be deep enough, and far enough away from a home, road, water source, food supply, etc. Not all communities have a lot of extra land, so you're talking one or two communal toilets, which need to be large to support a large population, and someone has to maintain them.
Literally any deep hole practically anywhere is a damn sight better than open defecation straight into the river, on the bank, or all over the streets. And it doesn't take an act of congress to fund it and change building codes, a civil engineer, excavator, and team of union laborers to get this stuff done like it does in the west. You just need someone who is personally motivated and determined and a shovel ideally. like this guy:
All you need is one person who knows that digging a hole would keep his kid from getting sick and dying and you'd have more trouble trying to stop him from digging that hole for an outhouse.
When that clicks for them. That their kid or wife or husband wouldn't have died if they bothered to dig an outhouse, they will be doing the work and telling everyone they know and also nagging people till their ears fell off when they catch someone shitting in the street.
And with viral growth, 10 years? Once 'everybody is doing it' it may not take as much time. How long did it take for cell phones to reach the most remote villages?
Doesn’t really work for China though. Plenty of public toilets around, and people (mostly children) will still take a shit in the street.
Hell, I was in Chongqing a couple months ago and saw a teenager literally unzip, in full view of everyone, and pea on (on, not into) a recycling bin. Next to a god damn public toilet.
I've seen people poop on the train platform in NJ. Really crazy, but Newark does not open the bathrooms until 7-8AM. So when you're waiting for the 3AM train to DC... what you gonna do?
I've a good 'decent' friend, who had to take a shit on the station platform. Because there was no other option available at the time. Some people can not hold their bowels. I'm sure he'd have surrendered to the station toilets if they were open. UK trains and stations frequently have shut or out of order toilets. I've foolishly hung on, thinking the train will be an option, only to discover it's a no can do. I'll go alfresco every time given the opportunity these days.
Still gross, but, does human urination spread any diseases?
Taking a shit in the street is perhaps not such a problem if you clean it up afterwards? Culture is hard to change, but perhaps it can be accommodated?
"really all they need to figure out first is to talk to each other before we build mobile cell towers for them"
innovations drive change drive more innovation. I recommend Hans Rosling's talks. There is no such thing as the "Third World" anymore, they're all on various development trajectories. Don't think e.g. Somalia is typical for Africa.
And what I'm saying is a outhouse /is/ a huge innovation to many places in Western Africa and India. It's largely a cultural problem like rampant littering or pollution. One guy digging an outhouse and shitting in it won't make any more difference than a single person recycling. But if enough people do it they will see a huge improvement in public health and infant mortality.
I'd argue that going from shitting in the woods to a well engineered and cheap toilet is a much more attractive step for most people than having them dig outhouses. It's like with the washing mashines - once electrification is there it's one of the first purchases since it's such a quality of life improvement, and this has happened for a majority of the world's population.
I just watched a segment on this (VICE, Vox, other?). In some places, the cultural taboo is cleaning the pit. So in parts of India, with a history of castes, the pits are made impracticably large, to that it never (rarely) needs to be emptied.
The silly thing is, that in it's very basic form, if you divide liquid and solid wastes at the point of exit, solid waste composts easily and readily, with some carbon additives and air. It is very low tech. Not so good in flood prone areas (without additional acre), and one has to be environmentally aware to say the least. But education is a winner here. I'm tied into a shitty contract with a plant owner that is operating illegally. And I've looked at alternatives, but the simplest really is just a bucket that is carried out to the garden. Posh compost toilets are just buckets in chambers that are well ventilated. If you have the space, you can incorporate the chambers into the house and preferably have some ability to rotate. Otherwise it's a case of emptying in a rodent proof heap. You can always compost twice. At least you can then use the waste. Rather than having to pump out sludge that may contain other household contaminants.
