Kitchen Grey water soak away

Greetings from South Africa,
I'm building a soakaway for my kitchen - sink and dishwasher water.
Can i simply run it into a buried trench - built a yard down, porous walls, and surrounded by gravel and biddim cloth?
Wondering about the build up of fats, and soapbuds from the dishwasher.
I will install a grease trap, but any design suggestions to dispose of kitchen grey water would be appreciated.
I'm quite rural, so no municipal issues.
Thanks

Here's a helpful website for grey-water:  http://oasisdesign.net/greywater/index.htm

In giai's garden book they have a good bit of information on how to do this..esp to cool the water that is too hot for the garden before it goes into the garden.

Best is to at least make a cooling pond, that will allow the hot dishwater or other to cool, you can kill plants with too much heat of the water..also you might want to have it go through a bog to filter the water from the overflow from the cooling pond..make sure your cooling pond overflows regularly into the bog so don't build it too large..the you can have the water from your bog filter go into the garden or another pond or whatever ..cause it is cooled and filtered..

if you are using chlorine you might want to make sure any plants can handle it.

One thing I learned the hard way is  not to have any kind of holding tank or filter, because it will clog and turn into stinky black water.   

Kellogg & Pettigrew recommend passing greywater through a pre-filter made of a plastic bucket full of chipped wood or brush. This filter medium is changed regularly.

This then feeds a "barrel breeder," a large container (they recommend a steel or plastic drum) with holes at the bottom which receives a bucketful of soaking wet, greasy chips, and then a bucket of clean dry ones, each time the filter is changed. Detritovores (often worms, woodlice, millipedes) find their way in through the holes at the bottom, and break down the wood. When a full drum has stood around for a couple months, it can be rolled to a place that needs mulch/compost, and the chickens empty it out, eating the detritovores.

You have to be very careful about which soaps and detergents you use in water you intend to release into soils.  In particular, anything with salt (sodium chloride) is a real no-no, and I imagine petroleum distillates are as well.  I placed a bulk order for Bio Pac brand dish soap and laundry soap with my local health food store, as it is the only brand I am aware of that is specially formulated for grey water compatibility.  I would love to know any other brands or formulas that are safe!

g'day jonny,

oursgoes direct from kitchen to garden via a plastic basin that we pre-rinse/wash in, using an earth friendly detergent and mixing it with my wee water, nothing builds up as this is distributed over about 16 sq/mts of garden beds, daily. we generally wash each second day.been doing this for at least a decade now with no adverse effects, i wouldn't be keen on adding dishwasher water to the garden seems those detergents are pretty powerful things, got a dishwasher sitting in the kitchen taking up space really, but when you want to sell it is what the modern person looks to see in the kitchen, trends hey?

len