Investigation of Phosphate Removal Capability of Blast Furnace Slag in Wastewater Treatment

The phosphate removal abilities and crystallization performance of quartz sand, ceramsite, blast furnace slag and steel slag were investigated. The residual phosphate concentrations in the reaction solutions were not changed by addition of the ceramsite, quartz sand and blast furnace slag. The steel slag could provide alkalinity and Ca2+ to the reaction solution due to its hydration activity, and performed a better phosphate removal performance than the other three. Under the conditions of Ca/P 2.0, pH 8.5 and 10 mg P/L, the phosphate crystallization occurred during 12 h. The quartz sand and ceramsite did not improve the phosphate crystallization, but steel slag was an effective seed crystal. The phosphate concentration decreased drastically after 12 h after addition of steel slag, and near complete removal was achieved after 48 h. The XRD analysis showed that the main crystallization products were hydroxyapatite (HAP) and the crystallinity increased with the reaction time. Phosphate was successfully recovered from low phosphate concentration wastewater using steel slag as seed material.

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Performance of geopolymer foams of blast furnace slag covered with poly(lactic acid) for wastewater treatment

Ceramics International ◽

10.1016/j.ceramint.2021.09.153 ◽

2021 ◽

Author(s):

Flávio James Humberto Tommasini Vieira Ramos ◽

Maria de Fátima Vieira Marques ◽

Vinícius de Oliveira Aguiar ◽

Fabio Elias Jorge

Keyword(s):

Wastewater Treatment ◽

Blast Furnace ◽

Lactic Acid ◽

Blast Furnace Slag ◽

Poly Lactic Acid ◽

Furnace Slag

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Performance of Granular Media from Blast Furnace Slag on Beer Wastewater Treatment

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.658.174 ◽

2013 ◽

Vol 658 ◽

pp. 174-177

Author(s):

Shan Ping Li ◽

Yan Yan Jiang ◽

Xue Yuan Zeng ◽

Xiang Ru Ma

Keyword(s):

Wastewater Treatment ◽

Blast Furnace ◽

Blast Furnace Slag ◽

Granular Media ◽

Oxygen Demand ◽

Physical Method ◽

Total Porosity ◽

Total Surface Area ◽

Ammonia Nitrogen ◽

Furnace Slag

In order to improve utilization ratio of blast furnace slag (BFS), the study used BFS, cement and building glue to make blast-furnace-slag granular media (BGM) in a non-sintered process. The characterization of BGM was analyzed by physical method, scanning electron microscopy (SEM) and D/max-rA X-ray diffraction (XRD). And the influence of hydraulic retention time (HRT) and air-liquid ratio (A/L) on the removal of average chemical oxygen demand (COD) and ammonia nitrogen (NH4+-N) were also investigated. The results indicated that the BGM presented high total porosity, large total surface area and low bulk and apparent density. The BGM reactor showed the good removal efficiency on COD and NH4+-N with HRT of 6 h and A/L of 5:1, which were above 86% and 90%, respectively. Overall, BGM showed good performance as wastewater treatment filter media in biological aerated filters (BAF), whose application is a promising way to use waste blast furnace slag.

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