Studies On Aerobic Composting Of Sludge With Mushroom Compost Application On Soil-Plant Ecosystems

In order to solve the problems of sludge disposal, improve the efficiency and quality of thesludge aerobic composting，Municipal sewage sludge mixed with mushroom compost at threedifferent ratios (2:1,1:1,2:3, dry weight) was aerobically composted for35d. During thecomposting process, temperature, moisture content, pH, organic matter, nutrition nutrients andgermination index(GI) were examined and analysed，Inferred the effect of sludge withmushroom compost composting. Use of compost products and mining wasteland soil mixed at0%,10%,20%,30%,40%,50%.Selection of representative garden plants of tall fescue, bermudagrass, heather, laurel andbeech tree to do potted comparative experiment. this paper did the following research:(1) Through on the analysis of the three mixed piles temperature, moisture content,germination index, nutrients and other indicators change, the results indicated that the maturitydegree of the end-products of three different ratios was more satisfactory,which all achieved theorganic fertilizers agriculture industry-standard. This results mushroom compost as an additivesludge aerobic fermentation feasible.(2) Comprehensive analysis of three groups heating process, germination index, thecompost maturity period, nutrient changes,1:1proportion of municipal sewage sludge andmushroom compost is the most appropriate ratio.(3) The pot tests showed different proportions of sludge compost soil physical andchemical properties to be improved effectively. Application of sewage sludge compost in andregulation of mine mine pH, The sludge application ratio is greater than30%, to achieve bettereffect of improving the soil pH value, Soil pH from8.28to7.26. The soil CEC significantlyimproved when the sludge compost of20per cent and above, were higher than20cmol/kg,showed that soil and fertilizer ability to achieve a strong level,according to soil fertilitystandards.(4) Sludge compost contains large amounts of nitrogen, phosphorus, potassium and othernutrients, after application of the sludge compost, the the soil nutritional components there weresignificant increase in. Application rate of50%, the soil organic matter content were highest,reached175.6g/kg. With the increase in the proportion of fertilizer, the nitrogen content of thesoil hydrolase were196.5-565.6mg/kg, Phosphorus content of23.25-156.62mg/kg,Potassium content of49-316mg/kg.(5) The application of sludge compost to soil can significantly increase activities of thecatalase,urease, invertase and alkaline phosphatase activity, and compost more, the increaserate was increased to varying degrees. In general, the proportion of compost30%, the highestaverage activity of soil enzymes.(6) Obtained by observing the growth of potted plants, these types of plants in the sludgecompost ratio of20%-40%growth conditions performed better, sludge compost ratio of30%,the plant height, diameter and biomass morphological indicators have reached the optimal...