Effect of Mangrove Biochar Residue Amended Shrimp Pond Sediment on Nitrogen Adsorption and Leaching

Abstract

Mangrove biochar residue was used for nitrogen adsorption and retention in sediment, which is beneficial for plant germination. The present study investigated the effect of contact time (5–360 min), biochar dosage (0.2–2 g L−1), pH (5–6), and initial concentration (2–10 mg L−1) on NH4+-N and NO3−-N adsorption. Three different adsorption isotherm models were used to fit the experimental data. Column leaching experiments were conducted to investigate the effect of biochar with sediment from a shrimp pond on nitrogen leaching at varying biochar dosages (0–8% w/w). The results showed that the maximum percentage of both NH4+-N and NO3−-N adsorption was achieved at an equilibrium contact time of 240 min, with an adsorbent dosage of 2 g L−1, and pH at 5.5 and 5, respectively. The adsorption of NH4+-N and NO3−-N were fitted to the Freundlich model and the adsorption process followed the physisorption and ion exchange. The addition of 8% biochar reduced both cumulative water volume and nitrogen leaching from the sediment. The biochar amendment increased the relative abundance of nitrifying and denitrifying bacteria in the sediment. This result suggested that biochar amended with sediment could be useful for nitrogen loss reduction.

Adsorption Kinetics of Cadmium and Lead by Biochars in Single- and Bisolute Brackish Water Systems

“…Mangrove, bamboo, and palm shell were collected from local communities in Thailand. Biochars derived from mangrove (MB) and bamboo (BB) were produced in a traditional brick kiln under slow pyrolysis at 500 ± 100 °C (adopted from Be et al 29 and Pinisakul et al 30 ). Palm-shell-derived biochar (PSB) was produced in an iron bucket under slow pyrolysis at 400 ± 100 °C.…”

Ammonium removal by alkaline‐activated coconut coir from synthetic and ground waters

“…Adsorption has been received considerable attention by worldwide researchers because of high effectiveness and economic for treatment of ammonium. 17,18 Therefore, numerous adsorbents have been developed to study their adsorptive performance on ammonium such as activated zeolite and chitosan, 19 greensand, 20 biochar, 17,[21][22][23][24] activated carbon, 18 clay minerals, 25 fiber, 26 magnetically modified excess sludge, 27 NaA zeolites, 28 and banana peels (BPs). 29 It was reported that the characteristics of surface chemistry is more important than surface area and pore structure of adsorbents in adsorption of inorganic compounds from aqueous solution.…”