城镇生活污泥焚烧炉渣用于草本种植试验初探

Preliminary Exploration of Urban Domestic Sludge Incineration Slag for Herbs Planting Experiment

为提高城镇生活污泥焚烧炉渣资源化利用率,文章探究了污泥焚烧炉渣用于草本种植的可行性。首先对炉渣的基本理化性质、重金属及养分等进行测定,对照相关标准,判断其用于草本种植的可能性。然后以不同掺渣率的土壤作为种植土,对3种常用绿化草本开展盆栽试验,研究炉渣掺入比例对草本生长的影响。结果表明,污泥焚烧炉渣中有机质及速效氮、有效磷和速效钾质量分数分别达到(14.6±0.3)g/kg及(46.7±1.5)、(80.5±3.1)、(410±18)mg/kg,营养成分丰富,且理化性质适宜,重金属含量满足要求,能够用于草本种植。土壤最佳掺渣率为20%,此时3种草本的生长和发芽情况明显优于空白组(不掺渣),土壤的保水性和持水性明显改善,且炉渣的掺入对土壤重金属无明显影响,能够满足草本种植限值需要。

In order to improve the resource utilization rate of domestic sludge incineration slag,the feasibility of using it for herbs planting was explored in this paper.Firstly,the basic physical and chemical properties,heavy metals and nutrients of the slag were determined,and the possibility of using it for herbs planting was judged according to the relevant standards.Then,pot experiments were carried out on three kinds of commonly used green herbs,whose planting soil was mixed with different ratios of slag,to study the effect of mixing ratio of slag on the growth of herbs.The results showed that the mass fraction of organic matter,available nitrogen,available phosphorus,and available potassium in the sludge incineration slag reached(14.6±0.3)g/kg,and(46.7±1.5),(80.5±3.1),(410±18)mg/kg,respectively.The sludge incineration slag was rich in nutrients,had suitable physical and chemical properties,and the heavy metal content in it could meet the requirements.So it could be used for herbs planting.The optimal slag addition rate in soil was 20%.At this time,the growth and germination of the three kinds of herbs was significantly better than the blank group(without slag addition),and the water retention and water holding capacity of the soil was significantly improved.Moreover,the addition of slag had no significant impact on heavy metals in soil,which could meet the requirements of herbs planting limits.