From waste water treatment to land management: conversion of aquatic biomass to biochar for soil amelioration and the fortification of crops with essential trace elements

Roberts, David A., Paul, Nicholas A., Cole, Andrew J., and De Nys, Rocky (2015) From waste water treatment to land management: conversion of aquatic biomass to biochar for soil amelioration and the fortification of crops with essential trace elements. Journal of Environmental Management, 157. pp. 60-68.

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Abstract

Macroalgae can be grown in industrial waste water to sequester metals and the resulting biomass used for biotechnological applications. We have previously cultivated the freshwater macroalga Oedogonium at a coal-fired power station to treat a metal-contaminated effluent from that facility. We then produced biochar from this biomass and determined the suitability of both the biomass and the biochar for soil amelioration. The dried biomass of Oedogonium cultivated in the waste water contained several elements for which there are terrestrial biosolids criteria (As, Cd, Cr, Cu, Pb, Ni, Se and Zn) and leached significant amounts of these elements into solution. Here, we demonstrate that these biomass leachates impair the germination and growth of radishes as a model crop. However, the biochar produced from this same biomass leaches negligible amounts of metal into solution and the leachates support high germination and growth of radishes. Biochar produced at 750 °C leaches the least metal and has the highest recalcitrant C content. When this biochar is added to a low-quality soil it improves the retention of nutrients (N, P, Ca, Mg, K and Mo) from fertilizer in the soil and the growth of radishes by 35–40%. Radishes grown in the soils amended with the biochar have equal or lower metal contents than radishes grown in soil without biochar, but much higher concentrations of essential trace elements (Mo) and macro nutrients (P, K, Ca and Mg). The cultivation of macroalgae is an effective waste water bioremediation technology that also produces biomass that can be used as a feedstock for conversion to biochar for soil amelioration.

Item ID: 38291
Item Type: Article (Research - C1)
ISSN: 1095-8630
Keywords: biochar, bioremediation, carbon sequestration, metals, soil amelioration
Funders: Australian Government Cooperative Research Centre Scheme, Australian Renewable Energy Agency (ARENA)
Projects and Grants: ARENA 002369
Date Deposited: 03 Jun 2015 23:29
FoR Codes: 05 ENVIRONMENTAL SCIENCES > 0503 Soil Sciences > 050301 Carbon Sequestration Science @ 20%
10 TECHNOLOGY > 1001 Agricultural Biotechnology > 100199 Agricultural Biotechnology not elsewhere classified @ 80%
SEO Codes: 82 PLANT PRODUCTION AND PLANT PRIMARY PRODUCTS > 8202 Horticultural Crops > 820215 Vegetables @ 50%
96 ENVIRONMENT > 9614 Soils > 961402 Farmland, Arable Cropland and Permanent Cropland Soils @ 50%
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