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Southwest University of Science and Technology (2015)

Basic Research on the Effect of Biomass Based Desert Amendment on Water-retaining Property and Nutrient Preserving Capability

孟秋风;

Titre : Basic Research on the Effect of Biomass Based Desert Amendment on Water-retaining Property and Nutrient Preserving Capability

Auteur :

Grade : Master’s Theses 2015

Université : Southwest University of Science and Technology

Résumé
In the paper biomass-based soil conditioner was prepared with lignin, recyled low density polyethylene(RLDPE) and leather cement that belong to huge industrial waste as raw materials by physical blending method, we systematically investigated the basic physical characteristics of aeolian sand and three kinds of biomass materials and the effect of soil conditioner on water physical property and nutrient-preserving capability of eolian sand for the purpose of high efficient and environment-friendly recycled use of waste resources and desertification control. Results indicate that:1. Desert aeolian sand used in this experiment mainly composed of fine sand, and particle size of sand between 0.1~0.25 mm accounted for over 80% of the total mass. Elements in aeolian sand mainly contain Si,0, Al, Ca, and a small amount of K, Fe, Mg element. Aeolian sand composed mainly of silica, potassium feldspar, sodium feldspar, calcium carbonate, iron calcium silicate and calcium sodium feldspar. Very low organic matter contained in the desert sand, C/H/N/S total four elements in a proportion of the total mass was less than 1.5%. C was the major element in lignin,RLDPE and leather, C/H ratio in lignin was about 0.924, which in RLDPE was about 0.496 and in leather cement was about 0.505.2. All of lignin, RLDPE and leather cement has a promoting effect on saturated water content of aeolian sand. When the content of lignin /RLDPE/leather cement in aeolian sand was 10/15/20 (%), saturated water content of aeolian sand was 73.39%,which was 3.87 times of control group, influence of leather cement and RLDPE reached extremely significant level and significant level on this index ; Moisture content at stable wilting point maximum value was 23.72%, and the increase rate compared with the control group was 391.12%, and leather cement showed an extremely significant level on this index ; Field capacity was 162.56% which comparing with the control group the increased rate was 716.88%, and RLDPE and leather cement showed significant promoting level. When the dosage of lignin/RLDPE/leather cement is 10/20/20(%), the effective water content of aeolian sand reached the maximum value and RLDPE and leather cement showed a significant promoting level. The influence level of three kinds of materials on the effective water content of aeolian sand was as follows:leather cement> RLDPE> lignin. Lignin, RLDPE and leather cement’s optimal dosage in eolian sand was 10%,20% and 20%, respectively. SEM analysis showed that modified materials can adhere to the surface of aeolian sand particles and promot soil’s agglomeration.3. Single factor test results show that when the content of RLDPE is 20%, bulk density of aeolian sand decreased to 0.91 g/cm3 and specific gravity decreased to 1.87, and bulk density and specific gravity of aeolian sand fell by 41.54% and 30.22% respectively ; When the content of lignin is 20%, bulk density of aeolian sand decreased to 1.31g·cm-3 and specific gravity decreased to 2.32, and the reduced rate was 16.03% and 13.43%, respectively ; When the content of leather cement was 20%, bulk density of aeolian sand was 1.34g·cm-3 and the drop rate was 14.1%, specific gravity was 2.28 and the decreased rate was 14.93%, namely under the condition of a certain content, all of lignin, RLDPE and leather cement can reduce bulk density and specific gravity of aeolian sand, and the influence of both leather cement and RLDPE on bulk density and specific gravity reached a significant level. When the content of leather cement was 20%, porosity of aeolian sand was 41.23% with a fall of 1.34% compared with the control group ; When the content of lignin was 10%, sand porosity reached the maximum value 46.12% and the increased rate was10.36% ; When we added 20% RLDPE in aeolian sand, the porosity was 51.32% which was 1.23 times that of the control group ; In the orthogonal experiment, when the dosage of Lignin/RLDPE/leather cement was 20/15/10 (%) in sand, porosity reached the maximum value 49.46% which was improved rate of 18.35%.4. When the content of lignin was 20%, potassium ion adsorption capacity of aeolian sand was 1.225 mg·g-1,112% higher than that of control group ; When its content was 5%, nitrate and phosphate adsorption capacity were 0.0484 mg·g-1 and 0.388 mg·g-1,increased by 226% and 948.65% respectively than that control ; When adding 10% RLDPE in aeolian sand, potassium ion, nitrate and phosphate adsorption capacity were 0.513 mg·g-1,0.0388 mg·g-1 and 0.052 mg·g-1, respectively, 0.77%,201% and 40.54% higher than that of control, respetively. Adding leather cement made potassium ion adsorption capacity decreased while made nitrate and phosphate adsorption capacity a certain degree of increase.When its adding content was 5%, potassium ion, nitrate and phosphate adsorption capacity were 0.580 mg·g-1,0.006 mg·g-1 and 0.105 mg·g-1, improving rate was 12.95%,84% and 185.32%, respectively. The influence level of three kinds of materials on nutrient preserving capacity of aeolian sand was as follows:lignin> RLDPE> leather cement.5. Lignin, RLDPE and leather cement can be used as modified materials directly to improve water-retaining and nutrient preserving characteristics of aeolian sand, while the content of leather cement and RLDPE should not be too much, namely leather cement dosage shoulds not be more than 15% and the content of RLDPE should not be more than 10% while dosage of lignin can be appropriately a little higher.

Mots clés : aeolian sand; soil conditioner; lignin; recyled low density polyethylene; leather cement; water and fertilizer preserving characteristics;

Présentation (CNKI)

Page publiée le 4 juin 2017