Yes, if it is simple purification system, and no toxic compounds. Anyway should check every separate case on toxicity (several samples), as you know that living organisms can accumulate heavy metals etc.

Reference Giant:

Look, e.g., Encyclopedia of Ecology (p. 765)

History in Asano & Levine WASTEWATER

RECLAMATION, RECYCLING AND REUSE: PAST, PRESENT, AND FUTURE

As well I'm attaching I perfect book from 2008 of Chech authors in English (all not in open access). If need good Encyclopedia with the material can sent as well, but it is about 3 hund. Mb, so over Mail !

Andrey

A lot of thanks, Andrey. I'll check on the materials.

Yes, even if it comes to heavy metals it is possible that the material can be composted, taking into account the levels required by the relevant legislation for produced compost. In this case what should be considered is metal levels, the use to which the compost produced is intended, and if the addition of another "clean" biodegradable material is feasible.

Isolate heavy metals from wetland plants and then make compost

Please can I have access to materials on the subject?

Thanks Salamma, I'll take your points into consideration.

It depends on the type of wastewater. If it is industrial effluent from textile industry or metal extraction industry, we can expect lots of toxic heavy metals. Plants absorb the even heavy metals but can't convert into another form. so it is better  to do chemical analysis after microbial composting of those used plants before use that compost to crop production or animal feed.

OK. Noted. Thanks

The answer is yes. However, the composition consistency of wetland plants would vary and, hence, the quality of the compost would be unreliable.

Hope this helps answer your question.

Professor Yehia Khalil

Yale University

USA 

Prof. Your response was timely and it really helped. Thank you.

The plants used in wetlands are of organic origin and thus will be good feedstock for composting. However, depending on the source of wastewater treated in the wetland, the aquatic plants may accumulate some substances such as heavy metals which may not degrade during composting.

If the aquatic plants like Typha and  Eichornia/water  hyacinth are used for the  treatment of the  waste  effluents from Industry with  heavy metal  contents, the  plants  will have  these highly toxic metal in the  plants and if composted, you will again pollute the soil throgh the  compost. These  plants on drying should be burnt and the metal salts can be  back recovered from their oxides

Research has shown (My Masters Thesis) that different parts of emergent macrophytes such as Typhi, Phragmites, or Spartina genus take us heavy metals into different parts of the plants.  Different heavy metals are concentrated into these parts, such as Pb and Cd into the roots, Hg into the tassels/seeds, etc.   Therefore it is possible to reduce the heavy metal load or even recover the metals by only digesting different parts of the plants and then composting the rest.

Your responses are ever useful. 

Oladipupo S O , Its most ideal to tesort to composting. Mix cattle feaces and sewage matter. When you have plantatter to be eaten. Ensure it is deep fried..and eaten.For example bananas grown..donot eat raw fruit.. the vegtbls are deep fried in chips. like french fries..and consumed..wwshs..

Yes I do have the opinion that metal contamination in compost has to be taken care while dealing with already treated plants for composting.