Had an email from Dave England asking: What do you do with smoke alarms that have low-level radiation sources in them?

He went on to explain that he’d heard that they should be replaced every ten years and his smoke alarms are now at least ten years old so he wants to know what he should do with them.

Ours are pretty new so we’ve not had this issue yet – but has anyone else come up against it?

According to Wikipedia, we’re looking at “a tiny mass of radioactive americium-241” in smoke detectors that use ionization and while Americium is widely used, like other similar elements (Actinides), it can have an impact on the environment – but there are few guidelines for disposing of old smoke alarms.

So, does anyone know if (and how) can they be safely recycled? Or are there are any safe reuses?

(Photo by cancsajn)

Colleen Christensen has asked:

Is there anything one can do with rancid cooking oil?

(I don’t know how rancid she means by rancid but let’s assume she just means used and therefore slightly icky – say oil or lard from deep frying – rather than full on bleugh.)

I know that commercial fryers can recycle their old oil (for use as biodiesel) but what about domestic chefs who aren’t using anywhere near as much? And what about other uses?

(Photo by float)

It’s been *slightly* windy in the UK over the past few days and there are lots of shattered slate tiles on the pavements around here.

My mum and dad, who live on the battered west coast, have spotted similar blown off tiles around them but the debris tends to be red roofing tiles rather than slate ones.

These tiles tend to be ridged or curved and around an inch thick – so not useful for all the flat things slate tiles can do, like be coasters. They’re also a rougher texture so can’t be used as mini-blackboards or anything like that.

So, presuming this is quite a common issue around the country at the moment, what can you do with blown down roofing tiles? Whole ones might be able to go back on the roof but what about broken ones?

(Photo by tome213)

This is another of those that I can’t believe we haven’t thought about yet: printer/photocopier paper.

It can, obviously, be recycled: as far as I know, most doorstep recycling schemes offer paper recycling and in all the places I’ve worked, there has been a green bin in the office for at least recycling white paper products, if not all different types like brown envelopes and newspaper.

However, I know not all offices are so green-focused without prompting – does anyone have any good strategies for getting employers to starting caring about this type of thing? Or know of any companies that offer recycling services to business?

And what about ideas for reuse? If something had only had printing on one side, I would either use the other side for printing drafts or make the blank side into scrap notepads (held together at the top with a bulldog clip). But what about other suggestions for reuses, including for when both sides have been printed on? And what confidential matter that can’t spend the next three months on the back of a notepad?

(Oh, and we got mentioned in the Guardian yesterday – if you’re here after reading that mini-article, hello! And if you want to know how to recycle said copy of the Guardian, we’ve plenty of ideas for recycling and reusing old newspapers.)

I bought a big bag of “reduced for a quick sale” potatoes a few of weeks ago and despite eating a good number of the starchy tubers, there are a few left at the bottom of the bag going quite, quite green.

Potatoes are one of the few things that grow in our clay-y north-facing garden so normally I’d happy plant out old ones and wait for new potatoes to grow in their place but with the weather as it is at the moment, I don’t fancy their chances if it gets suddenly frosty – or my chances of not being blown away and/or drowned while trying to dig a hole for them.

So are there any other things I can do with them instead of planting them out/winging them into the compost bin?

(Photo by lusi)