Preprint Article Version 1 This version is not peer-reviewed

The Impact of Lake Water Quality on the Performance of Mature Artificial Recharge Ponds

Version 1 : Received: 15 May 2019 / Approved: 16 May 2019 / Online: 16 May 2019 (10:29:49 CEST)

How to cite: Li, J.; Hägg, K.; Persson, K.M. The Impact of Lake Water Quality on the Performance of Mature Artificial Recharge Ponds. Preprints 2019, 2019050204 (doi: 10.20944/preprints201905.0204.v1). Li, J.; Hägg, K.; Persson, K.M. The Impact of Lake Water Quality on the Performance of Mature Artificial Recharge Ponds. Preprints 2019, 2019050204 (doi: 10.20944/preprints201905.0204.v1).

Abstract

Artificial groundwater recharge is commonly used for drinking water supply although the resulting water quality is highly dependent on the raw water quality, and in many cases, pre-treatment is required. Such pre-treatment improves the drinking water quality, although how and to what extent pre-treatment affects the subsequent pond infiltration process is still unknown. Here we evaluate the impact of two different pre-treatment methods of water from a eutrophic, temperate lake. An artificial recharge pond was divided into two parts, where one received raw water from a lake only filtered through a 500 µm pore size drum filter, while the other part received pre-treated lake water using chemical flocculation with polyaluminium chloride (PACl), combined with sand filtration (contact filtration). Changes in water quality were assessed at different stages in the two treatment processes. We show that contact filtration reduced phosphorus with 96 %. Moreover, the total organic carbon (TOC) reduction was improved from 55 % to 70 %, corresponding to an average reduction from 3.5 mg/L to 2.4 mg/L In addition, the pre- treatment in the artificial recharge pond reduced the cyanobacteria blooms and reduced the microcystin level. However, there were no sigificant differences in microcystin levels in the groundwater, i.e. the artifical recharge infiltration pond was effective for microcystin removal even without contact filtration. Hence, in a broader drinking water management perspective, the presented method is promising to reduce the levels of cyanobacterial toxins, as well as nutrients and TOC, which are all predicted to increase in a future climate change perspective.

Subject Areas

pre-treatment; contact filtration; artificial recharge ponds; infiltration ponds; nutrients removal; cyanobacteria; groundwater; microcystin; eutrophic lakes; TOC

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