Improving Potassium Recovery from Swine Wastewater and Evaluating the Effect of Recovered Solution on Biological Treatment

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  • Dote Yutaka
    Department of Civil and Environmental Engineering, University of Miyazaki
  • Sekito Tomoo
    Department of Civil and Environmental Engineering, University of Miyazaki

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Other Title
  • 養豚廃水からのカリウム回収率向上と回収後溶液の生物処理への影響

Abstract

In order to improve the recovery rate of potassium (K) from swine wastewater in the simultaneous recovery of nitrogen (N), phosphorus (P) and potassium, a recovery experiment was carried out with a pH range from 10 to 11. Further, to evaluate biological treatment of the solution after recovery, semi-batch treatment with activated sludge was investigated. It was found that with the conditions of pH 10.5, P/(N＋K) of 1.3, and Mg/P of 1.2 in molar ratio, N and K could be recovered at a rate of over 80 % and P concentration could be kept under the discharge standard. With these conditions, an N recovery rate of 81 % was reached, much higher than the previous recovery rate of 67 % and indicating improvement of the K recovery rate. An N recovery rate of 89 % was reached, so a high recovery rate was maintained. Furthermore, the net P recovery rate was 39-79 %, indicating that more P could be recovered than was added. TOC could be removed from the solution after recovery at a pH of 10.5, the same as from swine wastewater, without neutralizing the solution. No biological denitrification was required to meet the discharge standard for nitrogen.

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