CN-118985401-B - Farmland resource utilization method for building dregs

CN118985401BCN 118985401 BCN118985401 BCN 118985401BCN-118985401-B

Abstract

The invention relates to a method for recycling construction waste soil farmlands, which comprises the following steps of 1) drying and air-drying the construction waste soil after air-drying, 2) composting garden waste to obtain a garden waste compost product, 3) preparing a composite improvement medium, 4) preparing an improved dry-thermalized construction waste soil primary product by utilizing the composite improvement medium and the air-dried construction waste soil and garden waste compost product, and then standing and culturing the improved dry-thermalized construction waste soil primary product to obtain improved planting soil. The invention not only can solve the practical problem that the construction slag and the garden waste are difficult to treat, but also can realize the farmland resource utilization of the construction slag, thereby meeting the requirements of various aspects such as cultivated land resource protection, energy conservation, emission reduction, environmental protection, economic benefit creation and the like.

Inventors

ZHANG QICHUN
ZHANG LUWEN
WU YINGGAO
JIN SHUQUAN
YING HONG

Assignees

浙江大学

Dates

Publication Date: 20260505
Application Date: 20240813

Claims (3)

1. The farmland resource utilization method of the building dregs is characterized by comprising the following steps: 1) Drying and air-drying the building slag, namely removing solid matters with large particle size from the building slag, performing dry thermalization treatment, air-drying the obtained building slag after the dry thermalization treatment until the water content is less than or equal to 5%, crushing and sieving to obtain the air-dried building slag; the solid with large particle size is the solid with particle size larger than 50 mm; heating at 450+ -50deg.C for 20+ -5 min; 2) Composting garden waste: crushing garden waste of the 5 sides, and then adding municipal sludge of 0.45-0.55 sides for mixing to obtain a mixture; mixing 25+/-1 kg of urea, 2+/-0.1 kg of decomposing inoculant with water, spraying the mixture, fully mixing, stacking, and controlling the compost humidity to be 55% -65%; recording the temperature and humidity change of the center of the pile body at each interval of 24 hours, requiring the temperature to be not more than 65 ℃ and the humidity to be controlled at 50% -65% in the composting process, continuously composting for 5 months, and then crushing and sieving to obtain a garden waste compost product; 3) Preparing a composite modified medium: after peat is dried in air, mixing the dried peat, vermiculite and perlite according to the volume ratio of 3:1:2 to obtain a peat/vermiculite/perlite mixture; setting a peat/vermiculite/perlite mixture, wherein the weight ratio of building slag soil after air drying is 8-12%, and setting polyacrylamide solid particles, wherein the weight ratio of building slag soil after air drying is 0.08-0.12%; the polyacrylamide is weighed and dissolved in water to prepare a polyacrylamide aqueous solution with the mass concentration of 0.8-1.2%; spraying the polyacrylamide aqueous solution into the peat/vermiculite/perlite mixture, and uniformly mixing to obtain a composite modified medium; 4) And forming a modified dry-thermalized building slag product: Setting a garden waste composting product, wherein the weight ratio of building dregs after air drying is 8-12%; Adding the composite modified medium prepared in the step 3) into the air-dried building slag soil obtained in the step 1), uniformly mixing, and adding the garden waste compost product obtained in the step 2), uniformly mixing to obtain a modified dry-heated building slag soil primary product; Adding the improved dry-heated building slag soil initial product into a container, adding water to 58-62% of the field water holding capacity of the improved dry-heated building slag soil initial product, performing stationary culture for 9-11 d at room temperature, and properly supplementing water in the stationary culture process, so as to keep the water content of soil stable at 58-62% of the field water holding capacity, and obtaining the improved planting soil after the stationary culture is finished.
2. The method for recycling the construction waste soil in farmland according to claim 1, wherein in the step 1): Grinding through a 2mm sieve.
3. The method for recycling the construction waste soil in farmland according to claim 2, wherein in the step 2): Mixing 25+/-1 kg of urea, 2+/-0.1 kg of decomposing inoculant and 30-35L of water, spraying the mixture, fully mixing and stacking; Turning every 10 days, adding water into each turning, so as to keep sufficient water content of the compost, and if any one of temperature or humidity in the interval process of turning twice does not meet the above conditions, turning in advance.

Description

Farmland resource utilization method for building dregs Technical Field The invention relates to a method for recycling construction slag soil farmland. Background The proportion of building slag is increased along with the rapid development of economy and the construction of basic buildings, and the proportion of the building slag is about 30-40% of the total amount of garbage, and the amount of the building slag is increased at a rate of 10% per year. However, the recycling management of most construction wastes is not sufficient at present, and common treatment means are often to directly pile up the construction wastes outdoors or to landfill the construction wastes, so that the utilization rate of the construction wastes is very low, and the treatment of improper slag soil can pose a great threat to environment, economy and safety. The construction slag soil has a large amount of bacteria, dust and heavy metal substances can pollute the air, and a small amount of construction slag soil can generate carcinogenic substances to cause secondary pollution to the air after being burnt. When the amount of the deposited and landfilled muck exceeds a certain amount, geological disasters may be caused, and debris flow or landslide may be caused. Meanwhile, a plurality of recyclable resources exist in the building slag soil, and the direct landfill or incineration and other modes can cause damage to economy. In addition, a plurality of sulfate ions exist in the building slag, and the sulfate ions can be converted into highly toxic hydrogen sulfide gas under anaerobic conditions, so that the health and safety of a human body can be seriously influenced. With the development of economy and science, building dregs become one of the main parts of urban garbage at present, and the treatment of building dregs is also a problem of headache in many cities, and the improperly treated building dregs can cause damage to environment, economy and resources and also influence the health of human bodies. The existing treatment mode of building dregs is mainly a traditional mode of low efficiency and easy environmental pollution such as landfill, incineration and the like, and the current situation of insufficient cultivated land resources is also to be solved, but an improvement method for improving high-quality soil capable of planting crops by using the building dregs is lacking at present. Disclosure of Invention The invention aims to solve the technical problem of providing a farmland recycling method of building slag, which combines the building slag with garden waste, high molecular compounds, soil improvement mediums and the like to finally form farmland available planting soil. In order to solve the technical problems, the invention provides a farmland recycling method for building dregs, which comprises the following steps: 1) Drying and air-drying the slag soil to obtain air-dried building slag soil; 2) Composting garden waste to obtain a garden waste composting product; 3) Preparing a composite modified medium; 4) Formation of improved dry-thermalized construction slag products (improved planting soil): preparing an improved dry thermalized building residue soil primary product by utilizing a composite improvement medium and a building residue soil and garden waste compost product after air drying; and then standing and culturing the improved dry-thermalized building residue soil initial product to obtain the improved planting soil. As the improvement of the farmland resource utilization method of the building dregs, the invention comprises the following steps: 1) Drying treatment and air drying of dregs: Removing large-particle-size solid matters from building slag soil (including slurry soil, stone, brick and other solid matters), performing dry thermalization treatment, air-drying the obtained building slag soil after the dry thermalization treatment, crushing and sieving (2 mm sieve) to obtain air-dried building slag soil; 2) Composting garden waste: Crushing 5-party garden waste (including dead leaves, barks, woods and branches) into powder (the particle size is 5 mm-10 mm), and then adding 0.45-0.55-party municipal sludge for mixing to obtain a mixture; mixing 25+/-1 kg of urea, 2+/-0.1 kg of decomposing inoculant with water, spraying the mixture, fully mixing, stacking, and controlling the compost humidity to be 55% -65%; Recording the temperature and humidity change of the center of the pile body at each interval of 24 hours, requiring the temperature to be not more than 65 ℃ and the humidity to be controlled at 50% -65% in the composting process, continuously composting for 5 months, and then crushing and sieving (sieving with a 2mm sieve) to obtain a garden waste compost product; 3) Preparation of composite improved media Air-drying peat (Sjog danli peat soil) until the water content is less than or equal to 5%, and mixing the air-dried peat, vermiculite and perlite according to the volume ratio of 3:1:2 to