海相淤泥用于种植土改良技术研究

沿海港口、航道建设及维护过程中，产生大量海相淤泥，其含盐量高，理化性质差，难以直接利用。本文通过淋滤试验，探究土壤pH值、土壤含盐量与淋滤量的关系，并利用秸秆、砂、生物炭、有机肥、脱硫石膏等材料组成的掺入剂对海相淤泥进行改性试验。研究结果表明，试样土样经过间歇性1000 mL淋滤量，土壤pH值、土壤含盐量等参数降至规范标准值以内；淋滤初期存在土壤碱性不减反而略微升高的现象；土壤含盐量随淋滤次数增加而降低，中间阶段（4~8次）淋滤时因土柱中形成渗流通道，土壤含盐量降低效率减小。海相淤泥先经过淋滤

RESEARCH ON TECHNOLOGY OF IMPROVING MARINE SILT FOR PLANTING SOIL

With the large-scale development of water conservancy projects in my country, marine silt has a certain impact on the offshore environment and the construction and maintenance of engineering facilities, and affects ports and waterway transportation. Therefore, a large amount of marine silt is urgently awaiting treatment and utilization. This paper explores the relationship between soil pH,soil salinity and leaching amount through leaching tests, and using admixtures composed of straw, sand, biochar, organic fertilizer, desulfurized gypsum and other materials to modify marine sludge test. The results of the study showed that the soil pH value and soil salt content of the sample soil fell within the standard value after the intermittent 1000 mL leaching volume; the soil alkalinity did not decrease but slightly increased at the beginning of leaching; the salt content decreases with the increase of the number of leaching. During the intermediate stage(4 to 8 times) of leaching, due to the formation of seepage channels in the soil column, the efficiency of reducing the soil salt content decreases. The marine sludge was first leached and