The corn cob biochar (CCB600) was prepared at 600℃ with wasted corn cob as raw material. The modified corn cob biochar (CCB600-M) was prepared by modifying CCB600 with hydrochloric acid and ultrasonic. CCB600 and CCB600-M were added into constructed rapid infiltration (CRI) systems respectively as one of the filter materials, and their effect on wastewater treatment performance was investigated. The results showed that the average removal rates of COD, NH4+-N and TP in CRI reactor with adding CCB600-M were respectively 4.8%, 6.1% and 18.2% higher than those with adding CCB600, and respectively 9.3%, 11.4% and 39.7% higher than those without adding any biochars. The modified corn cob biochar was a new type of filter materials with excellent performance and low price, which can effectively improve the wastewater treatment performance of CRI systems.
Sheep manure biochar (SMB550) was prepared by limited oxygen pyrolysis at 550°C and applied to constructed rapid infiltration (CRI) systems. The structural characteristics of SMB500 were tested and its effect on the wastewater treatment performance of CRI systems was investigated. The results showed that SMB550 had a large specific surface area, abundant pore structure and rich functional groups, showing a good adsorption potential. Using SMB550 as one of the filter material of CRI system, the average removal rates of COD, NH4+-N and TP were respectively 9.3%, 8.6% and 34.9% higher than those of the blank group, which enhanced the treatment performance of CRI systems for wastewater. As a new type of filter material, SMB550 had a good application prospect in the field of wastewater treatment.
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