不同性状城市污水污泥在草坪生产中的应用研究

Study on the application of raw sludge and compost sludge in lawn production

将城市污水污泥的生污泥和腐熟污泥施用于土壤,对该土壤上生长的高羊茅的生物量、土壤的理化特性等进行测定,并将污泥肥效与鸡粪进行了对照。结果表明,腐熟污泥对高羊茅生长的抑制作用主要表现在地上部分,对于其地下部分的生长存在着促进作用,而生污泥对高羊茅生长的促进作用主要表现在地上部分,施用量较大时会对其地下部分的生长产生轻微的抑制作用;施用腐熟污泥后,无论种植前还是刈割后土壤容重都普遍降低,而生污泥的施用则有可能堵塞土壤孔隙,降低孔隙度,从而使土壤容重增加;施用生污泥后,土壤中的碱解氮、有效磷、有机质含量均有不同程度的增减,且有时生污泥会在土壤中产生发酵,导致吸氮现象的发生,施用腐熟污泥后,大大增加了土壤养分,但在高羊茅生长过程中土壤长期存在有效磷富余的情况,有时也会产生吸氮现象;在草坪生产过程中施用适量的腐熟污泥,不仅可以拓宽城市污水污泥的使用途径,还能够降低草坪的生产成本,提高土壤肥效,是一条经济可行的途径。

The batch experiments of lawn production were conducted with raw sludge and compost sludge as fertilizer and Gramineae.Festuca arundinacea as test plant.The growth of Gramineae.Festuca arundinacea and property of soil after fertilization were investigated,and the fertilizer efficiency of sludge was compared with that of chicken manure.Results showed that the compost sludge had certain inhibiting effect on overground portion of Gramineae.Festuca arundinacea,but it could promote underground portion growth.The promotion effect of raw sludge to Gramineae.Festuca arundinacea was mainly in the overground portion,its inhibiting effect to underground portion was slight and only in large quantity of application.Appling compost sludge could decrease the soil bulk density,while raw sludge could increase the soil bulk density for the soil pore clogging.After the raw sludge applying,the organic C,alkalined N and available P in soil varied in different degree.Fermentation of the raw sludge in soil could lead the N adsorption.Compost sludge applying could increase the effective soil nutrients,and N adsorption could also happen because of the surplus available P in soil.In conclusion,compost sludge was suitable to be applied as fertilizer in lawn production.