Application of floating treatment wetlands in a highly eutrophic lake, Indonesia: a new tool for lake restoration and provision of microhabitat

Abstract

Two sets of floating treatment wetlands (FTWs) have been evaluated as a tool for lake restoration and microhabitat provision for aquatic biota in a highly eutrophic and polymictic Lake Maninjau, Indonesia. Each FTW system consisted of 14 units square floating frame built using PVC pipes and palm sugar fibres as material mat transplanted onto net. All units of FTW were planted with different vegetation composition arrangement then placed inside the square metal frame attached on buoyant plastic drums to support the FTWs against the wave. The plants used in this study were Canna variegata, Vetiveria zizanioides, Cyperus papyrus, Echinodorus polaefolius and Limnocharis flava. FTWs were evaluated for 7 months for nutrient removal efficiency and other water quality indicators. Despite unstable lake conditions accompanied by strong waves and lake mixing, the cage and the PVC frame of FTWs applied remained intact and providing the buoyancy to support the plant growth. The plants in FTWs grew and adapted well in the turbulence water and even in the hypoxic conditions. Improvement of lake water quality in the FTWs area may be small but the accumulated nutrients content in the plant shoots suggests high removal of nutrients. In total by the end of observation, one FTWs system could remove > 100 g N and > 7 g P from the lake water. During field observation, important local fish and diverse wildlife activities were recorded including inhabiting, foraging, breeding, nursing and resting in the FTWs. Our study suggests that FTWs can be a promising tool for lake restoration to improve lake water quality and for microhabitat provision.

Pengelolaan Kualitas Air Danau Melalui Pendekatan Biogeokimia

“…Terobosan riset yang berhasil dilakukan berupa inovasi teknologi perbaikan kualitas air danau menggunakan pendekatan biogeokimia. Inovasi teknologi ini menggunakan aplikasi in situ sistem constructed wetlands dan sistem aerasi untuk perbaikan kualitas air danau yang tercemar bahan organik dan nutrien Henny, Kurniawan, & Akhdiana, 2019;Henny, Kurniawan, & Trisuryono 2019;Henny dkk., 2020).…”

“…Lanskap danau area riparian, seperti komposisi dan struktur vegetasi berperan dalam mendukung keseimbangan proses biogeokimia untuk menurunkan beban polutan . Teknologi remediasi, seperti aplikasi teknologi secara kimia (Davidson dkk., 2021;Susanti dkk., 2012), teknologi constructed wetland (lahan basah buatan), dan teknologi aerasi merupakan teknologi yang menggunakan pendekatan biogeokimia untuk perbaikan kualitas air atau pengolahan air limbah (Henny, Kurniawan, & Akhdiana, 2019;Henny, Kurniawan, & Trisuryono, 2019;Henny dkk., 2020;, Henny dkk., 2022a, 2022b.…”

“…4. Aplikasi teknologi perbaikan kualitas air menggunakan pendekatan biogeokimia, seperti teknologi constructed treatment wetland (Henny, 2018b;Henny, Kurniawan, & Akhdiana, 2019;Henny, Kurniawan, & Trisuryono, 2019;Henny dkk., 2022aHenny dkk., , 2022b, teknologi aerasi (Henny dkk., 2020), dan penambahan beberapa elemen mineral adsorben. Pemanfaatan teknologi ini mampu mendukung keseimbangan proses biogeokimia danau dalam mencegah dan mempercepat perbaikan kualitas air danau yang rusak dan terganggu akibat pencemaran (Henny dkk., 2010;Henny & Gunawan, 2022;.…”

“…Hal ini dilakukan agar meningkatkan pemahaman publik. Inovasi teknologi perbaikan kualitas air danau menggunakan pendekatan biogeokimia sudah dilakukan melalui aplikasi teknologi constructed wetlands darat dan apung (Henny, Kurniawan, & Akhdiana, 2019;Henny, Kurniawan, & Trisuryono, 2019;Henny dkk., 2022aHenny dkk., , 2022b yang diintegrasikan dengan sistem aerasi air mancur, dan ultra fine bubble aerator Buku ini tidak diperjualbelikan. (Henny dkk., 2020).…”

Pemanfaatan Floating Treatment Wetland Untuk Pengolahan Air Limbah Penatu

“…Penelitian lainnya yaitu mengenai aplikasi FTW yang berlokasi di Danau Maninjau, Provinsi Sumatera Barat [6]. FTW ditempatkan pada dua area yang berbeda yaitu area Muko-muko dan area Bayur.…”