Sulfur and Sulfur-Iron Particles Packed Reactors for Simultaneous Advanced Removal of Nitrogen and Phosphorus

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Abstract

The sulfur particles and mixed sulfur-iron particles packed reactors were developed to simultaneously remove nitrate and phosphorus of the secondary effluent from municipal wastewater treatment plants. To overcome the problem of blockage, the sulfur particles packed reactor was developed as the deaerator, the sulfur and iron particles filling modes were optimized, and back wash was adapted. Low effluent dissolved oxygen (DO) (<0.4 mg/L) were obtained with different flow rates and 90% dissolved oxygen was removed. When the flow rates changed from 0.4 to 1.2 mg/h, the phosphorus in effluents were lower than 0.2 mg/L. The nitrate removal rates [~1 000 mg NO₃^--N/(L·d)] were achieved with the two filling modes. The blockage happened (the hydraulic loss ~53 kPa) in the completely mixing packed sulfur-iron particles packed reactor after continuous operation 50 d. After operating 100 d, there was not blockage in the separating mixing packed sulfur-iron particles reactor. Regularly backwashing also helps to solve the blockage.

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	Articles by authors
	Su Xiaolei
	Liu Xuejie
	Liang Peng
	Huang Xia

Keywords： sulfur-based autotrophic denitrification； sulfur-iron particles； nitrogen and phosphorus removal

Received 2015-03-15;

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Su Xiaolei, Liu Xuejie, Liang Peng, Huang Xia.Sulfur and Sulfur-Iron Particles Packed Reactors for Simultaneous Advanced Removal of Nitrogen and Phosphorus[J] Chemcial Industry and Engineering, 2015,V32(4): 63-67

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