Integrated real-time control strategy for nitrogen removal in swine wastewater treatment using sequencing batch reactors

• Published in: Water research (Oxford) Vol. 38; no. 14; pp. 3340 - 3348
• Main Authors: Kim, Ju-Hyun, Chen, Meixue, Kishida, Naohiro, Sudo, Ryuichi
• Format: Journal Article
• Language: English
• Published: Oxford Elsevier Ltd 01.08.2004; Elsevier Science
• Subjects: Animals; Applied sciences; Biological and medical sciences; Biological treatment of waters; Bioreactors; Biotechnology; Carbon - isolation & purification; Denitrification; Environment and pollution; Exact sciences and technology; External carbon source; Fundamental and applied biological sciences. Psychology; Hydrogen-Ion Concentration; Industrial applications and implications. Economical aspects; Nitrites - chemistry; Nitrogen - isolation & purification; Nitrogen - metabolism; Organic Chemicals - isolation & purification; Organic Chemicals - metabolism; ORP Real-time control; Other wastewaters; Oxidation-Reduction; Pollution; SBR; Swine; Swine wastewater; Time Factors; Waste Disposal, Fluid - methods; Wastewaters; Water Pollutants - isolation & purification; Water treatment and pollution; Denitrification; SBR; ORP Real-time control; Swine wastewater; External carbon source; Process control; Animal slurry; Real time system; Biological purification; Vertebrata; Bioreactor; Mammalia; Sequencing batch reactor; Swine; Agriculture; Rearing; Artiodactyla; Redox potential; Waste water purification; Monitoring control system; Ungulata
• ISSN: 0043-1354; 1879-2448
• DOI: 10.1016/j.watres.2004.05.006

A new integrated real-time control system was designed and operated with fluctuating influent loads for swine wastewater treatment. The system was operated with automatic addition control of an external carbon source, using real-time control technology, which utilized the oxidation–reduction potential (ORP) and the pH as parameters to control the anoxic phase and oxic phase, respectively. The fluctuations in swine wastewater concentration are extreme; an influent with a low C/ N ratio is deficient in organic carbon, and a low carbon source level can limit the overall biological denitrification process. Consequently, a sufficient organic source must be provided for proper denitrification. The feasibility of using swine waste as an external carbon source for enhanced biological nitrogen removal was investigated. The real-time control made it possible to optimize the quantity of swine waste added as the load fluctuated from cycle to cycle. The average removal efficiencies achieved for TOC and nitrogen were over 94% and 96%, respectively, using the integrated real-time control strategy.