Effect Of Wood-Based Biochar And Sewage Sludge Amendments For Soil Phosphorus Availability

Abstract

This study investigated the effects of two biochars (pyrolysed wood chips and garden clippings) on phosphorus (P) availability in a heavy-metal contaminated soil poor in phosphorus. Short-term 14-days incubation experiments were conducted to study how applications of biochars at different rates (1 and 5 %) in combination with (1:1) and without dried sewage sludge from a municipal waste water treatment plant (WWTP) affected the content of soil extractable P. For P-availability analyses deionized water, calcium acetate lactate (CAL), Mehlich 3 and Olsen extraction protocols were applied. In addition, the content of total and mobile forms of potentially toxic heavy metals (PTHM) was studied. Application of both biochars caused a significant decrease of PTHM available forms in sewage sludge amended soil samples. The concentration of total and available P increased with higher biochar and sewage sludge application rates.

Pyrolysis Products as Soil Fertilizers: Screening of Potentially Hazardous Aromatic Compounds

“…Waste and by-products from various industrial processes and municipal waste are still frequently disposed in landfills whereas in the past they often have been discharged to the sewage water system or to the aquatic environment (FRIŠTÁK and SOJA, 2015). The application of untreated sewage sludges to agricultural land is regionally either completely banned or tightly controlled.…”

A review of phosphorus recovery from different thermal treatment products of sewage sludge

“…Heavy metals are less solution from PSSC because they are more strongly incorporated in the particles. Moreover, the application of biochar to soil can increase soil C sequestration, reduce atmospheric CO 2 concentrations, the bioavailability of some heavy metals, improve physicochemical soil quality, and alter the content and availability of nutrients [79][80][81].…”

Sanitary and environmental aspects of sewage sludge management

“…Nevertheless, lately it has been recognized that the addition of activated carbon or biochar to sewage sludge immobilizes the bioavailable fractions of polycyclic aromatic hydrocarbons and metal elements (Ko nczak and Oleszczuk, 2018). Moreover, Frišták and Soja (2015) recognized that the addition of biochar produced from wood chips and garden residues into the sewage sludge and its application as soil amendments have increased the content of available forms of phosphorus. The positive effects of the addition of sewage sludge-derived biochar were also observed during the process of vermicomposting of sewage sludge, where it significantly reduced the bioavailability of Cd and Zn for Eisenia fetida earthworms (Mali nska et al, 2017).…”