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Effects of Three Kinds of Sewage Sludge on Physiol

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龙源期刊网 http://www.qikan.com.cn Effects of Three Kinds of Sewage Sludge on Physiological Characteristics of Flower Plants 作者:Yanyan HU Xiang CHEN Fuyin XU Bing BAO 来源:《农业生物技术(英文版)》2019 年第 02 期 Abstract Effects of dried sludge, digested sludge and composted sludge (obtained from the raw sludge of a large sewage treatment plant in Chongqing City) on the physiological characteristics of Salvia splendens, Tagetes patula and Petunia hybrida were studied. The results showed that the application of sludge could significantly promote the growth of three kinds of flowers and improve their quality. The effects of sludge application rate on the biological characteristics of three kinds of flowers were significant. The optimal application rate of the sludge for the growth of three kinds of flowers was 50% (mass percentage) for S. splendens and 37.5% for P. hybrida and T. patula. The effect of sludge type on the biological characteristics was not significant. However, among the three types of sludge, composted sludge had the highest organic matter content and cation exchange capacity and the lowest salt content, so the improvement of garden soil by composted sludge was relatively significant and safe. Key words Sewage sludge; Heavy metals; Flower; Physiological characteristics Sewage sludge, the sediment produced in the process of urban sewage purification[1], and its output is huge and increases rapidly. It has become a new source of pollution and posed a great threat to urban environment, so it is imminent to solve the problem of sludge disposal[2-3]. The sludge from municipal sewage plants is rich in available nitrogen, phosphorus, trace elements and organic matter but contains heavy metals, pathogens, toxic and harmful organic pollutants, etc., which restricts the resource utilization of sludge[4-5]. Utilization of sewage sludge in gardens has the advantages of low cost and no entry into the human food chain. Its application technology has been widely studied by scholars at home and abroad, and sewage sludge has been successfully applied in gardens in cities such as Beijing, Shanghai and Shenzhen[6-8]. The treated sludge product can be used as both a cultivation medium and an organic fertilizer. In this paper, effects of three kinds of common sludge in Chongqing (dried sludge, digested sludge and composted sludge) on the growth of Salvia splendens, Tagetes patula and Petunia hybrida were studied to provide theoretical and practical support for the application of sewa



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