Sanitary Engineering

The solution to pollution is dilution.

Eh?

Well then use of and air pump to push fresh air through the tail pipe would reduce air pollution

They call this 'graywater'. It contains few live bacteria, but does have biological oxygen demand (BOD) from the washed off foods. It also has detergent residue.

The local water dept will advise the max BOD you can discharge, and they will also advise you on detergent residues. You may be able to adjust the detergent to a biologically greener one.

You can also get the restaurant to squeegee plates into a solid food waste bin. This will lower what gets washed off the plates. Sometimes the slops can go to pig farmers, but they have limits on what the pigs will tolerate.

You can use a constructed wetland to do this. It can be incorporated into the landscape to save space. The treated water can then be reused for washing the restaurant, flushing the toilets etc. I have designed such a system to recover water for non-potable use in a school, the first in my country, and it has won an award from the national water agency.

DVader1000,

I too would like to read what you proposed...it it in the public domain.We are looking at development projects that will require just what you say.

best

GA

Hi Cynthia,

What about using chemical treatment like enzyme etc. calling all chemical engineer, please help!!!

Hi DVader1000,

Your design product is quite interested, can you be able to share us some design process or can you please send it to me on my private message I would really appreciate.

Kind regards

It utilizes a 3 stage process. First is a Grease Trap to remove excess FOG (fats, oil and grease). From here, the water will flow to a Subsurface Flow wetland to oxidize and breakdown the organics. Finally, the water will flow into a Free Water Surface wetland for UV from natural sunlight and natural predation to remove any remaining pathogens, as well as to remove dissolved minerals. The water can then be pumped for reuse.

If you send me your email address, I'll send you the schematic drawing.

CYNTIA, I HAVE THE SAME PROBLEM IN COSTA RICA WHERE I AM BUILDING

SOME BEACH FRONT CONDOS. MY GREEN IDEEA IS:

CLEAN AS MUCH THE SOLID WASTE OF THE PLATES AND SO...WASH WITH

BIODEGRADABLE DETERGENT(IN CONTROLED QUANTITEES,

HAVE THE GRAY WATER GOING INTO A POOL,TAKE THE PH AND IF IS TO HIGH

USE 50-100 GRAMES OF SODIUM DIOXIDE(BAKING SODA)WHEN YOU REACH

PH APROX.4 HAVE ALL GRAY W.GOING TO BE AERATE.

IF YOU HAVE TO MUCH SOLID MATTER YOU CAN USE PER CUBIQUE METER

200GR EAST STARTED WITH HALF A KILO OF SUGAR THEN ADED TO THE GRAY W.

HAVE A SAND FILTER,OR CLAY ,OR A COMBINATION OF THOSE AND PAS THE

GRAY W. TROUGH THE SISTEM .THE RESULT IS A REUSABLE WATER FOR GARDENING.

THEY ARE SYSTEMS MOR COMPLICATED!!!BUT THE RISOLT IS ALLMOST DRINKING WATER..))

OK...IF YOU WANT MORE DETAILES SEND ME AN E.M. AT:

SORINODELUCA@LYCOS.COM

OR GO TO MY WEB.

http://cr.sorinodeluca.com hope it work 4 u. sorino de luca

axcuses....sodium dicarbonate

(sodium bicarbonate) sorino

If pH is too high add sodium bicarbonate.

I suspect you mean to use sodium bicarbonate to raise the pH. To lower it you need something like vinegar or any other acid.

I would expect most gray water to be alkaline.

Your use of yeast to handle excess solids seems a good idea.

i axcuse you 2!...:is hard to be old ...

now i have new glasses so i can remember the:

mendeleev table of elements. yes bicarbonate de sodium.

mia culpa!

yours...sorino

Cynthia,

Depending upon the local and state enforcement authorities regualtions there are a numbe rof options you can utilize, septic suystem are sometimes allowed, though waste from restaurants tends to perform poorly in septic systems do to the variations in quality that adversely effect the microbial ecology. Another option is storage and land disposal if the waste water qualifies. They land dispose some really nasty waste waters from municipal wastewater plants, food processing plants, Dairies, ect.. that only have primary treeatment in the storage impoundments to remove large solids.You can dispose of wastewater on non-consumable crops at agronomic rates, a study of the rates of disposal and land requirements need to be performed by a licensed Civil Engineer in most authorities in the US (Some also allow RGs in the cases where a substantial system design is not required). You use treatment above primary and some secondary is used in many areas where land cost or available area are such that treatment would be cheaper.

It might be helpful if we knew which authority you were under. My division of my company specializes in wastewater conveyance, treatment, and disposal, along with water systems. We are worldwide, so i might be able to get you into contact with a local engineer if needed. You can contact me at Bret.Swain@AECOM.com for more information or a contact.

Dont forget the installation of grease trap holding tanks at the restaurants and there constant cleanout intervals by contractors who do this .