Abstract:Hainan Wenchang green pepper were used as raw material. Six water quality indicators (COD, BOD5, pH, ammonia nitrogen, TN and TP) in sewage from traditional water retting (A), microbial enzyme (B) and frozen mechanical peeling (C), were measured and compared. The qualities of white pepper were compared and analyzed. The results showed that the water quality indicators by three kinds of peeling methods had great difference. COD value ranged from 742.31 ± 23.82 to 1.89×104 ± 332.90 mg/L, BOD5 value from 445.54 ± 23.68 to 9.21×103 ± 130.13 mg/L, pH from 5.03± 0.05 to 7.44±0.06, ammonia nitrogen value from 59.88 ± 4.56 to 164.47 ± 8.85 mg/L, TN value from 101.23 ±18.73 to 499.02±27.59 mg/L, TP from 17.78 ± 0.44 to 41.92 ± 2.95 mg/L. These were V water. The order of the pollution degree of the wastewater was A sample sewage > B sample sewage > C sample sewage. The BOD5 /COD of three kinds of peeling sewage was bigger than the 0.4. BOD5 /TN was greater than the 4.00. BOD5/TP was greater than 25. These indicated that the pepper desquamate sewage could be better biochemical, the carbon source content of the denitrification of the peeling sewage was sufficient, and the sewage water quality met the biological phosphorus removal demand. Wastewater treatment technology can be considered in a reasonable combination of various biochemical treatment technologies. The quality of white pepper obtained by microbial enzyme was the best and the time of frozen mechanical peeling was the shortest. In order to improve the quality and industrialization of pepper, the traditional water-retting peeling must be obsoleted and the new processing method of mechanical peeling and microbial enzymatic combination should be developed.
