lab scale constructed wetland is not expensive.
recently we constructed it and expenditure is only 5k (4m 1m 0.5m)
Design and construct a lab scale wetland should be quite easy. In lot of studies there is lab scale wetland with area of only 1 m2, so it is only a small box filled with specific material (it depends on what you want to test) and it's being filled with small pump with sample of artificial wastewater prepared in a lab. I think, that in such case, the testing of the water is more expensive than the lab scale wetland itself..
But there are lot of types of CWs and also there is a lot of things you can test, so I think you need to be more specific with your test hypothesis for developing the best design of the lab-scale CW.
I agree with Vit answer, what do you want to test? What kind of CWL, what kind of wastewater? etc.
In a recent paper we built a single house CWL and did some research on it. See attached.
Also look at these publications
Zhu et al., 2018 Influence of vegetation type and temperature on the performance of constructed wetlands for nutrient removal. https://iwaponline.com/wst/article-abstract/77/3/829/38530
Gross et al., 2008. Small scale recirculating vertical flow constructed wetland (RVFCW) for the treatment and reuse of wastewater. Water Science & Technology 58: 487-494.
For more of Prof. Amit Gross work see here
http://w3.bgu.ac.il/ziwr/faculty/gross/publications.htm
For lab scale work (mostly vertical CW) please see this recent paper from Liang et al. 2017
https://www.ncbi.nlm.nih.gov/pubmed/28837857
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