In our project area, we are generating 35 MLD greywater daily.
What is the best technology available to treat greywater and reuse for irrigation purposes?
I would like to know the feasibility of these technologies, as well as economical details. If someone has reused greywater in practical situation please share your case studies and treatment details.
We have an unqiue technology to grow Diatom Algae to treat sewage and grey water. This is invented in india. You just require a open tank or pond to treat the wastewater and the treated water can be used for irrigation. There will be no foul odor from the tank or pond, since Diatoms produce Oxygen.
If you have space for a big pond, you can grow fish in the pond. This is an excellent waste to wealth solution.
In the USA it is common practice to filter grey water to 120 microns and use it with landscape turf or trees with subsurface drip irrigation. This is low cost combined with low risk. To read about this technolgy please go to: http://geoflow.com/research_w.html . If you are interested I will introduce you to a supplier in India.
Many yeaars ago I lived with the Gratt familyin a small village in the Black Forest of Germany. Herr Gratt was the mayor of the village. My room was above the stables and next to the Rauchzimmer (the room where all of the meats were smoked). I looked out of my window early one morning and the Herr Burgermeister was leading a round 100 gallon tank drawn by his horse up to his fields. On inquiry at dinner, I asked what hehad been doing. He had been taking the liquid waste from the house to irrigate his fields. It was released through a ball valve where it fell onto a semi-circular spreader. That was it. He had done this his entire life and his ancestors for hundreds of years is my guess.
Run a full Chemical analysis first including BOD,COD and TSS. Without it you can't get the right answer for the right treatment. As the concentration of the grey-water varies during the day get more than one sample at different times.
Also gather flow rates throughout the day so you can determine your mass flow and peak flow. Greywater contamination and flow tends to vary throughout the day and you will need this to size your treatment system for upstream peak flow or to design a surge tank (unless you choose to send that greywater to waste during these periods).
We have non biological treatment for sewage - grey water. The output water will be colourless and odourless with COD BOD within discharge norms. Best part of the system is that it does not require large open tanks for aeration and there is no foul odour spread from STP. The system being non biological - it always work unlike microbial system which de5 pends on the mood of microbes. Most important: Operating cost of our XERODROP STP is 10% lsess as compared to any microbial system. Farmer who is taking up the treated water will never complain about foul smell that is guaranteed! Please write us to info@aeolusbioenergy.com or aeolus.bioenergy@gmail.com for more details. Niraj Mithani
The treated effluent from STP can be used for gardening. If you treat the effleunt with tertiary treatment, then the treated water can be used for Agriculture & Toilet flushes ( they should have seperate Pipelines)