Minimizing heavy metals in recovered struvite from swine wastewater after anaerobic biochemical treatment: Reaction mechanisms and pilot test

The feasibility of anaerobic ammonium oxidation (anammox) process to treat wastewaters containing antibiotics and heavy metals (such as the liquid fraction of the anaerobically digested swine manure) was studied in this work. The specific anammox activity (SAA) was evaluated by means of manometric batch tests. The effects of oxytetracycline, sulfathiazole, copper and zinc were studied. The experimental data of the short-term assays were fitted with an inhibition model to identify the half maximal inhibitory concentration (IC50). After 24 h exposures, IC50-values equal to 1.9, 3.9, 650 and 1,100 mg L−1 were identified for copper, zinc, sulfathiazole and tetracycline respectively. The effect of prolonged exposure (14 days) to oxytetracycline and sulfathiazole was studied by means of repeated batch-assays. Anabolism and catabolism reactions were active during the inhibition tests indicating that anammox bacteria could grow even in the extreme conditions tested. Considering the average concentrations expected in swine wastewaters, the inhibitors studied do not seem to represent a problem for the application of the anammox process. However, in order to verify the effect of these compounds on the growth of anammox bacteria, continuous culture experiments could be conducted.

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Effects of swine wastewater irrigation on soil properties and accumulation of heavy metals and antibiotics

Journal of Soils and Sediments ◽

10.1007/s11368-021-03106-7 ◽

2021 ◽

Author(s):

Liu Tian ◽

Hongyong Sun ◽

Xinliang Dong ◽

Jintao Wang ◽

Yali Huang ◽

...

Keyword(s):

Heavy Metals ◽

Soil Properties ◽

Wastewater Irrigation ◽

Swine Wastewater

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Accumulation of sodium and heavy metals in soil cultivated with Corymbia citriodora after the application of swine wastewater

Bioscience Journal ◽

10.14393/bj-v36n3a2020-39509 ◽

2020 ◽

Vol 36 (3) ◽

Author(s):

Rafaella Ferreira Batista Bernardes ◽

Laura Rayane Rodrigues Oliveira ◽

Renato Aurélio Severino de Menezes Freitas ◽

Murilo Henrique de Deus Bernardes ◽

Regina Maria Quintão Lana ◽

...

Keyword(s):

Heavy Metals ◽

Statistical Design ◽

Soil Nutrient ◽

Swine Wastewater ◽

Nutrient Contents ◽

Final Destination ◽

Mineralization Of Organic Matter ◽

Chemical Attributes ◽

June July ◽

Corymbia Citriodora

The confinement of pigs stands out as a great generator of swine wastewater (SW). The final destination of waste generated is currently a concern of society, since if handled improperly, it can cause serious impacts to the environment. One of the alternatives is the use of SW as a source of nutrients, which are made available to the plants, after the mineralization of organic matter. The objective of this work was to compare soil chemical attributes under two planting arrangements, in single and double lines of Corymbia citriodora. Two experiments were carried out at the Bonsucesso farm, in Uberlândia-MG, the first with C. citriodora in simple lines, with five plants per plot, spacing two meters between plants and 15 meters between rows. The second experiment was with C. citriodora in double lines, with two meters between plants in the line, three meters between lines in the plot and 15 meters between the double lines of C. citriodora. The statistical design was in randomized blocks. The treatments used were five doses of SW (0; 200; 400; 600 and 800 m³ ha-1) with five replicates. The application of SW rates was divided in the dry season, in the months of June, July and August. The chemical characteristics of the soil were evaluated in the 0-20 cm depth layer. Planting on double lines of C. citriodora provided higher soil nutrient contents. The application of swine wastewater raised the levels of potassium and heavy metals such as copper and zinc. The dose of 200 m3 ha-1 provided adequate levels for most nutrients present in the soil.

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