CN105983572A - Soil heavy metal remediation agent - Google Patents

Abstract

The invention discloses a soil heavy metal remediation agent. The soil heavy metal remediation agent is prepared from, by weight, 14-15 parts of pulverized fuel ash, 12-15 parts of kelp residues, 9-11 parts of monopotassium phosphate, 33-36 parts of soybean cake powder, 22-24 parts of turf, 4-5 parts of ammonium chloride, 80-85 parts of seed removed sunflower plates, 24-26 parts of dry rabbit dung powder, 22-25 parts of kaolin, 10-12 parts of calcium carbonate, 36-40 parts of slash pine leaves and a proper amount of water. According to the soil remediation agent, by means of adding of the turf, the kelp residues and other fermentation materials, a large quantity of organic matter and nutritional ingredients can be provided for contaminated soil, and the potential fertility of the contaminated soil is improved; and the pulverized fuel ash, the kaolin and the like further have the loosening function on the soil, the water-holding capacity of the soil is improved, and therefore the fertility of the land is achieved while soil heavy metal contamination is eliminated, the soil is suitable for being used for planting and greening, and the utilization value of the soil is greatly increased.

Description

A kind of heavy metal-polluted soil renovation agent

Technical field

The present invention relates to technical field of soil remediation, particularly relate to a kind of heavy metal-polluted soil renovation agent.

Background technology

The source of China's heavy metal pollution mainly includes that Industrial " three Waste " discharge, house refuse are oozed out, family is coal-fired and motor vehicle exhaust emission etc..The industries such as plating, plastics, chemical industry, mineral smelting processing are the key industry sources of heavy metal, and coal-fired release is also one of major reason of heavy metal pollution of soil, and motor-vehicle tail-gas also can significantly cause the heavy metal pollution of roadside soil.In domestic waste, part contents of heavy metal elements exceeds standard, and long-term stacking also can make heavy metal leak in soil, causes regional soil local content of beary metal to increase.In addition the long-term unreasonable use such as chemical fertilizer, pesticide, muck also results in heavy metal pollution of soil.

The coercing of heavy metal can cause lacking and the reduction of activity of macronutrient in plant, has suppression plant to the absorption of the mineral element such as calcium, magnesium and turn-over capacity when heavy metal concentration is higher.The heavy metal element easily sulfydryl in the active part of enzyme is combined, the effect of the indispensable element in generation metallic element replacement sulfur albumen, biological essential elements such as such as Mg2+, Ca2+ etc., the activity reduction for want of causing antioxidase was even lost efficacy, and did great damage the antioxidant system in families of plant.

The recovery technique of heavy metal contaminated soil mainly uses chemical means at present, but a large amount of chemical agents used in repair process easily cause the recontamination of soil.Charcoal has good absorption property, stable chemical nature, it is possible to reduce the biological effectiveness of heavy metal in soil, can improve crop yield simultaneously, and raw material is extensive, low cost so that it is have clear superiority and using value in the soil administering heavy metal pollution.

To this end, current inventor provides a kind of with the heavy metal soil-repairing agent that charcoal is immobilized substrate, the reparation for soil pollution provides a kind of effective way.

Summary of the invention

The object of the invention is contemplated to make up the defect of prior art, it is provided that a kind of heavy metal-polluted soil renovation agent.

The present invention is achieved by the following technical solutions:

A kind of heavy metal-polluted soil renovation agent, is prepared by the raw materials in: flyash 14-15, kelp residue 12-15, potassium dihydrogen phosphate 9-11, soybean cake powder 33-36, peat composed of rotten mosses 22-24, ammonium chloride 4-5, go seed sunflower plate 80-85, dry rabbit excrement powder 24-26, Kaolin 22-25, calcium carbonate 10-12, Needle of Slash Pine 36-40, water appropriate.

Specifically comprising the following steps that of the preparation of described heavy metal-polluted soil renovation agent

(1) seed sunflower plate and dry rabbit excrement powder will be gone to dry in sun underground, after pulverizing, mixing is placed in baking oven at 50-60 DEG C drying 12-13 hour, gained disintegrating slag is placed in sealed furnace, it is warming up to 530-570 DEG C with the speed of 20 DEG C/min, and it is incubated 90-120 minute, it is cooled to afterwards when 60-70 DEG C take out, obtains charcoal；

(2) Kaolin is mixed with calcium carbonate it is placed in calcining furnace, calcine 40-60 minute at 650-680 DEG C, take out after being cooled to room temperature, obtain calcined powder standby；

(3) step 1 gained charcoal and step 2 gained calcined powder are mixed, be laid in immediately below the low-pressure mercury gas lamp of peak value 253.7nm at 63-67mm, take out after irradiating 14-16 hour, obtain modification biological charcoal standby；

(4) putting in fermentation vat by flyash, soybean cake powder, the peat composed of rotten mosses, kelp residue mixing, in fermentation 3-4 week, period constantly adds water and keeps fermentation heap water content at 55-60%, to fermentation materials squeeze and filter after having fermented, obtains fermentation solid residue and fermentation liquid；

(5) pull an oar after Needle of Slash Pine being mixed by weight 1:2 with water, and obtain serosity by filtered through gauze, serosity and fermentation liquid are mixed and added into potassium dihydrogen phosphate, ammonium chloride, be incubated after stirring and being heated to 50-60 DEG C, until liquid is evaporated, obtain powder standby；

(6) mixing of charcoal, fermentation solid residue, step 5 gained powder and leftover materials is placed in comminutor, makes spheroidal particle, obtain heavy metal renovation agent of the present invention.

The using method of the present invention is for being embedded at upper soll layer 10-20cm by renovation agent after being turned over by contaminated soil, and every mu of soil uses 100-120kg renovation agent.

The invention have the advantage that

Kaolin coordinates the modified calcining of calcium carbonate to improve the shock-absorbing capacity of soil, adds the tolerance of soil heavy metal, improves activeness and the plant availability of heavy metal in soil.

Charcoal and calcined kaolin mixed radiation, both the superincumbent all kinds of miscellaneous bacterias of attachment had been eliminated, avoid secondary pollution, can be formed on charcoal surface simultaneously favourable surface then such as-OH, the hydrophilic atomic groups such as-COO ,-CO ,-COOH, improve the unit are adsorbance of charcoal, the sticking to pollutant shows higher surface adsorption efficiency.

The leaf juice energy activating soil heavy metal of highly acidity in pinus elliottii, chelating moiety heavy metal utilizes for plant, then adsorbs residual gravity metal by charcoal, reaches the reparation purpose of heavy metal-polluted soil.

The soil-repairing agent of the present invention can supply the substantial amounts of organic matter of contaminated soil and nutritional labeling by the interpolation of the fermentation material such as the peat composed of rotten mosses, kelp residue, improve the potential fertility of contaminated soil, flyash, Kaolin etc. also have fluffing action to soil, and improve its water-holding capacity, thus the soil that reaches to foster and apply fertilizer while eliminating heavy metal pollution of soil, make it suitable for plantation and greening uses, the value of soil is significantly increased.

Detailed description of the invention

A kind of heavy metal-polluted soil renovation agent, is made up of the raw material of following weight portion (kg): flyash 14, kelp residue 12, potassium dihydrogen phosphate 9, soybean cake powder 33, the peat composed of rotten mosses 22, ammonium chloride 4, go seed sunflower plate 80, dry rabbit excrement powder 24, Kaolin 22, calcium carbonate 10, Needle of Slash Pine 36, water appropriate.

Specifically comprising the following steps that of the preparation of described heavy metal-polluted soil renovation agent

(1) seed sunflower plate and dry rabbit excrement powder will be gone to dry in sun underground, and after pulverizing, mixing is placed in baking oven at 50 DEG C drying 12 hours, is placed in sealed furnace by gained disintegrating slag, it is warming up to 530 DEG C with the speed of 20 DEG C/min, and it is incubated 90 minutes, it is cooled to afterwards when 60 DEG C take out, obtains charcoal；

(2) Kaolin is mixed with calcium carbonate it is placed in calcining furnace, calcine 40 minutes at 650 DEG C, take out after being cooled to room temperature, obtain calcined powder standby；

(3) step 1 gained charcoal and step 2 gained calcined powder are mixed, be laid in immediately below the low-pressure mercury gas lamp of peak value 253.7nm at 63mm, take out after irradiating 14 hours, obtain modification biological charcoal standby；

(4) flyash, soybean cake powder, the peat composed of rotten mosses, kelp residue mixing being put in fermentation vat, ferment 3 weeks, period constantly adds water and keeps fermentation heap water content 55%, to fermentation materials squeeze and filter after having fermented, obtains fermentation solid residue and fermentation liquid；

(5) pull an oar after Needle of Slash Pine being mixed by weight 1:2 with water, and obtain serosity by filtered through gauze, serosity and fermentation liquid are mixed and added into potassium dihydrogen phosphate, ammonium chloride, be incubated after stirring and being heated to 50 DEG C, until liquid is evaporated, obtain powder standby；

(6) mixing of charcoal, fermentation solid residue, step 5 gained powder and leftover materials is placed in comminutor, makes spheroidal particle, obtain heavy metal renovation agent of the present invention.

In order to further illustrate the using value of the present invention, inventor chooses one piece of heavy-metal contaminated soil the checking using renovation agent of the present invention to carry out repairing effect, applying renovation agent in soil 60 days, soil sampling carries out the detection of content of beary metal mensuration and soil physico-chemical property respectively after 180 days, and data are as follows:

	Before reparation	Repair latter 60 days	Repair latter 180 days
				P in soil H-number	7.09	7.05	7.06
Soil TOC content (g/kg)	43.28	50.46	58.00
				Soil CEC(cmol/kg)	8.71	9.68	10.91
Cadmium in Soil content (mg/kg)	43	5	3
				Content of Pb in Soil (mg/kg)	951	245	60
Soil Cr content (mg/kg)	1836	309	132
				Mercury in Soil content (mg/kg)	1378	160	55

Be can be seen that by data above, after employing soil-repairing agent of the present invention, in soil, various heavy content substantially reduces, and in soil, organic carbon level and Cation Exchange Capacity in Soils are all improved simultaneously, illustrates that heavy metal-polluted soil renovation agent of the present invention has significant improved effect to soil.

Claims (2)

1. a heavy metal-polluted soil renovation agent, it is characterized in that, be prepared by the raw materials in: flyash 14-15, kelp residue 12-15, potassium dihydrogen phosphate 9-11, soybean cake powder 33-36, peat composed of rotten mosses 22-24, ammonium chloride 4-5, go seed sunflower plate 80-85, dry rabbit excrement powder 24-26, Kaolin 22-25, calcium carbonate 10-12, Needle of Slash Pine 36-40, water appropriate.

2. according to the heavy metal-polluted soil renovation agent described in claims 1, it is characterised in that specifically comprising the following steps that of preparation method

(1) seed sunflower plate and dry rabbit excrement powder will be gone to dry in sun underground, after pulverizing, mixing is placed in baking oven at 50-60 DEG C drying 12-13 hour, gained disintegrating slag is placed in sealed furnace, it is warming up to 530-570 DEG C with the speed of 20 DEG C/min, and it is incubated 90-120 minute, it is cooled to afterwards when 60-70 DEG C take out, obtains charcoal；

(2) Kaolin is mixed with calcium carbonate it is placed in calcining furnace, calcine 40-60 minute at 650-680 DEG C, take out after being cooled to room temperature, obtain calcined powder standby；

(3) step 1 gained charcoal and step 2 gained calcined powder are mixed, be laid in immediately below the low-pressure mercury gas lamp of peak value 253.7nm at 63-67mm, take out after irradiating 14-16 hour, obtain modification biological charcoal standby；

(4) putting in fermentation vat by flyash, soybean cake powder, the peat composed of rotten mosses, kelp residue mixing, in fermentation 3-4 week, period constantly adds water and keeps fermentation heap water content at 55-60%, to fermentation materials squeeze and filter after having fermented, obtains fermentation solid residue and fermentation liquid；

(5) pull an oar after Needle of Slash Pine being mixed by weight 1:2 with water, and obtain serosity by filtered through gauze, serosity and fermentation liquid are mixed and added into potassium dihydrogen phosphate, ammonium chloride, be incubated after stirring and being heated to 50-60 DEG C, until liquid is evaporated, obtain powder standby；

(6) mixing of charcoal, fermentation solid residue, step 5 gained powder and leftover materials is placed in comminutor, makes spheroidal particle, obtain heavy metal renovation agent of the present invention.