Wetlands

So judging by this set of experiments there is a correlation between what The Thames River Phosphorus Reduction Collaborative are attempting to do and what the scientists in the abstract below were testing. That is removing and perhaps even recovering phosphorus from agricultural runoffs. And certainly preventing such runoffs from entering the natural water systems untreated. Much like what we are doing in China eh!

Oh and have a look at that first very telling sentence!

"Ecological Engineering
Volume 122, 15 October 2018, Pages 84-90
Ecological Engineering
Possibilities of Phoslock® application to remove phosphorus compounds from wastewater treated in hybrid wetlands

Abstract
Treatment wetland technologies for wastewater treatment can be easily applied for removal of all pollutants except phosphorous. They are applicable in a small towns and rural areas, places where conventional wastewater treatment plant cannot properly operate because of common economic constraints. In Poland only the 8% of rural areas are equipped with sewer system, thus treatment wetlands might be an alternative, effective and low-cost method to treat wastewater from households. The aim of this study was to optimise the operational parameters for Phoslock® application on treated wastewater and to prove that Phoslock® may also be successfully used to remove phosphorus compounds from treated wastewater and possibly recover them. Phoslock® also known as lanthanum-modified bentonite (LMB) is an adsorbent material developed by the Land and Water Division of Australia’s CSIRO (Commonwealth Scientific and Industrial Research Organization). Experimental trials were carried out in the laboratory with batch reactors pilot units in three separate stages to establish sorption capacity of material, define characteristic constants of isotherms of adsorption and verify kinetic parameters by using pseudo-second order model. Carried out research confirmed high sorption capacity of LMB – Phoslock® for removal of phosphorous compounds from wastewater both synthetic and effluent from treatment wetland. Performed kinetic studies have shown that LMB is much less effective in case of real effluent from WWTP (2.09 mg/g) than in synthetic wastewater (4.31 mg/g). Langmuir and Freundlich adsorption models have shown relatively good matching of isotherms in graphical. Results obtained for kinetic studies have shown correlation coefficient close to 1.0 both for synthetic and effluent from WWTP. Application of LMB caused not only a rapid decrease of PO43−-P concentration, but also no other meaningful influence on the water solution was discovered."