Study on the treatment of village sewage and urease activity of soil in cultivated paddy field

doi:10.14088/j.cnki.issn0439-8114.2021.10.007

Abstract

Abstract: In order to study the efficiency of cultivated paddy field wetland in absorbing village sewage and the urease activity of paddy soil, and to reveal the changing law of nitrogen, phosphorus and other nutrient elements in sewage with the growth of rice and the transformation characteristics of nitrogen, a low load level subsurface flow paddy field wetland was constructed with paddy field as the carrier, and the relationship between the urease activity of paddy field wetland soil and the growth of rice and the effect of sewage treatment was analyzed. The results showed that when the rice was in tillering stage, the average removal rates of COD, TP, NH₃-N and TN were the highest and 47.2%, 84.0%, 78.9% and 68.6%, respectively, and the effluent quality indexes could reach the class V of environmental quality standard for surface water （GB 3838—2002）. The changes of urease activity and the relationship between urease activity and nitrogen transformation in cultivated paddy field wetland showed that during the whole rice growth cycle （July to November）, the content of urease activity in soil reached the highest level in rice tillering stage, and then decreased slowly. At the same time, due to the rich microorganism in wetland soil, the content of urease in soil layer was higher than that in filling layer in rice growth stage. After the sewage enters into the wetland, the consumption of ammonia nitrogen drove the stimulation growth of urease, and the urease activity in the soil was significantly related to the total nitrogen.

Key words: paddy wetland, water treatment, rural domestic sewage, paddy soil enzyme

CLC Number:

S151.9

CHEN Jie, CHEN Jie, WANG Yi-chao, PENG Ming-guo, GUI Song, ZHANG Wen-yi. Study on the treatment of village sewage and urease activity of soil in cultivated paddy field[J]. HUBEI AGRICULTURAL SCIENCES, 2021, 60(10): 33-37.

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