Preparation method of nano magnetic material loaded mineral soil for reducing COD and heavy metals in excrement biogas slurry wastewater

A nano-magnetic material and biogas slurry wastewater technology, which is applied in the field of wastewater treatment materials, can solve the problems of slow reaction rate of zeolite and mineral soil, high energy consumption in the process of propagation and purification, etc.

Active Publication Date: 2020-08-28
BEIJING FAIRVIEW NEW TECH CO LTD
View PDF11 Cites 7 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The biological pond method has the advantages of simple operation and efficient decontamination, but there are still many problems, including the unreasonable structure of the biological pond, low purification load, and widespread silting problems, etc.
The application limitations of the ecological pond treatment system are: (1) It covers a large area and is suitable for promotion in areas with large areas of wasteland; (2) It is prone to short-flow phenomena, resulting in the actual hydraulic retention time being less than the design hydraulic retention time, and hydraulic retention Time refers to the average residence time of sewage to be treated in the reactor; (3) when the temperature is high, it is easy to generate odor, breed mosquitoes and interfere with residents' life; (4) the removal effect of nitrogen and phosphorus is unstable
The use of zeolite and mineral soil has limitations. First, the adsorption and exchange capacity of zeolite and mineral soil is low, and the regeneration operation is frequent; second, the reaction rate of zeolite and mineral soil is slow in actual operation, and the water production is small.
[0010] At the same time, the nutrients rich in manure and biogas slurry, such as nitrogen, phosphorus and potassium, exist in the form of quick-acting state, and the absorption rate is high, which is an indispensable component of the plant growth process; the disadvantage of direct use or discharge to the field is that the transportation cost is high , and the direct discharge of manure and biogas slurry will cause chemical oxygen demand COD exceeding the standard, water pollution, germ transmission, etc.; after purification, the discharge will meet the standard, but the purification process consumes a lot of energy, is expensive, and causes waste of resources; breeding manure Sewage and biogas slurry are resources, which should be utilized as resources and turned into products through a series of scientific methods

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Preparation method of nano magnetic material loaded mineral soil for reducing COD and heavy metals in excrement biogas slurry wastewater
  • Preparation method of nano magnetic material loaded mineral soil for reducing COD and heavy metals in excrement biogas slurry wastewater
  • Preparation method of nano magnetic material loaded mineral soil for reducing COD and heavy metals in excrement biogas slurry wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0073] The raw water is biogas slurry produced by anaerobic digestion of breeding wastewater from a cattle farm in Yinchuan. Before the test, it was filtered with a filter cloth to remove large suspended particles. The quality of the filtered water samples is shown in Table 1-1.

[0074] Table 1-1. Test raw water quality

[0075] project unit Raw water index data pH 9.20 NH 3 -N

mg / L 2685 COD mg / L 1972 BOD5 mg / L 240 TP mg / L 101 Conductivity ms.cm -1

39.80 Turbidity NTU 56.70 total lead mg / L 13.40 Total Cadmium mg / L 1.08 total mercury mg / L 1.50 total chromium mg / L 9.10 arsenic mg / L 7.32 nickel mg / L 27.70

[0076] 1. First, filter the manure or biogas slurry, inject 1000mL of filtrate into the reaction tank, and put KH into the reaction tank 2 PO 4 , to adjust the PO in the solution 4 3- : NH 4+ =1:1 (molar ratio); put MgCl into the reaction pool ...

Embodiment 2

[0124] The raw water is biogas slurry produced by anaerobic digestion of breeding wastewater from a cattle farm in Yinchuan. Before the test, it was filtered with filter cloth to remove large suspended particles. The water quality after filtration is shown in Table 2-1.

[0125] Table 2-1 Test raw water quality

[0126] project unit Raw water index data pH 9.20 NH 3 -N

mg / L 2685 COD mg / L 1972 BOD5 mg / L 240 TP mg / L 101 Conductivity ms.cm -1

39.80 Turbidity NTU 56.70 total lead mg / L 13.40 Total Cadmium mg / L 1.08 total mercury mg / L 1.50 total chromium mg / L 9.10 arsenic mg / L 7.32 nickel mg / L 27.70

[0127] 1. First, filter the manure or biogas slurry, inject 1000mL of filtrate into the reaction tank, and put KH into the reaction tank 2 PO 4 , to adjust the PO in the solution 4 3- : NH 4+ =1.25:1 (molar ratio); put MgCl into the reaction pool 2 6H ...

Embodiment 3

[0175] The raw water is manure from Lingwu cattle farm. Before the test, it was filtered with filter cloth to remove large particles of suspended matter. The quality of filtered water samples is shown in Table 3-1.

[0176] Table 3-1 Test raw water quality

[0177] project unit Raw water index data pH 9.60 NH3-N mg / L 3367 COD mg / L 2564 BOD5 mg / L 320 TP mg / L 167 Conductivity ms.cm -1

40.11 Turbidity NTU 57.30 total lead mg / L 11.50 Total Cadmium mg / L 1.12 total mercury mg / L 1.16 total chromium mg / L 8.90 arsenic mg / L 7.33 nickel mg / L 26.5

[0178] 1. First, filter the manure or biogas slurry, inject 1000mL of filtrate into the reaction tank, and put KH into the reaction tank 2 PO 4 , to adjust the PO in the solution 4 3- : NH 4+ =1.2:1 (molar ratio); put MgCl into the reaction pool 2 6H 2 O, adjust the Mg in the solution 2+ : NH 4+ =1.05:1 (molar r...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

PropertyMeasurementUnit
chemical oxygen demand (mass)aaaaaaaaaa
chemical oxygen demand (mass)aaaaaaaaaa
water absorptionaaaaaaaaaa
Login to view more

Abstract

The invention relates to a preparation method of nano magnetic material loaded mineral soil for reducing COD and heavy metals in excrement biogas slurry wastewater, which comprises the following steps: preparing FeCl2.4H2O and FeCl3.6H2O into a mixed solution, heating, ultrasonically oscillating and stirring the mixed solution; adding an NH3.H2O solution, performing reaction curing, and cooling the reaction product; carrying out magnetic separation and cleaning to obtain nano Fe3O4 magnetic particles; stirring and dispersing nano Fe3O4 magnetic particles in deionized water, carrying out ultrasonic oscillation, adding an aqueous solution of a coating agent, carrying out a reaction so as to enable Fe3O4 to be fully adsorbed, and carrying out cooling so as to prepare a nano Fe3O4 magnetic fluid; processing the mineral soil into a suspension, then adding nano Fe3O4 magnetic fluid, carrying out ultrasonic oscillation dispersion, then introducing into a crystallization reaction kettle for crystallization, and washing the crystal with water to be neutral to prepare the nano magnetic material loaded mineral soil. The nano magnetic material is loaded with mineral soil, so that the nano magnetic material can be prevented from gathering in the treatment process, the gathering degree of magnetic nanoparticles can be greatly reduced, a magnetic composite material is formed, and COD and heavy metals in wastewater are effectively reduced.

Description

Technical field [0001] The invention belongs to the field of wastewater treatment materials, and specifically relates to a preparation method of nanomagnetic materials loaded with mineral soil to reduce COD and heavy metals in fecal sewage slurry wastewater, and a nanomagnetic material-loaded mineral soil treatment method for treating sewage sewage slurry, nanomagnetic Liquid biofertilizer and solid biofertilizer made from sewage and biogas slurry treated with material-loaded mineral soil. Background technique [0002] In 2015, China's agricultural COD and ammonia nitrogen emissions were 106,867,260 tons. Data show that the five-day biochemical oxygen demand (BOD5) of farm wastewater is as high as 2,000 to 8,000 mg / L, and the COD is as high as 5,000 to 20,000 mg / L. The pollutant content is relatively high. The livestock and poultry breeding industry has become the main source of pollutants, especially organic pollutants, with a contribution rate of nearly 40%. With the gra...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/12B01J20/22B01J20/24B01J20/14B01J20/18B01J20/30B01D29/05C02F11/00C05G3/80C05G5/20C05G3/70C05G3/00C05G3/40C05G3/90C05G5/10C02F101/20C02F101/16C02F103/32
CPCB01D29/05B01J20/14B01J20/18B01J20/22B01J20/24C02F1/00C02F1/281C02F1/285C02F1/481C02F1/66C02F9/00C02F11/00C02F2101/16C02F2101/20C02F2101/22C02F2103/20C02F2103/32C02F2209/05C02F2209/06C02F2209/08C02F2209/14C02F2209/18C05B7/00C05G3/00C05G3/40C05G3/70C05G3/80C05G3/90C05G5/10C05G5/20C05C9/00C05F5/006C05F7/00C05F9/04C05F11/02C05F11/08
Inventor 苏文雯苏文锦苏斌
Owner BEIJING FAIRVIEW NEW TECH CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap