Unlock instant, AI-driven research and patent intelligence for your innovation.

A kind of pretreatment method for strengthening nitrogen extraction in landfill leachate

A technology for landfill leachate and pretreatment, applied in the environmental field, can solve problems such as affecting the nitrogen extraction efficiency of leachate, and achieve the effects of reducing the total nitrogen concentration, improving crystal nucleation and precipitation, and enhancing reliability.

Active Publication Date: 2022-07-01
NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA
View PDF15 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The leachate of village and town garbage transfer stations contains non-reactive ammonium nitrogen, as well as organic acids and humic acids, which will significantly affect the nitrogen extraction efficiency of leachate

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
  • A kind of pretreatment method for strengthening nitrogen extraction in landfill leachate
  • A kind of pretreatment method for strengthening nitrogen extraction in landfill leachate
  • A kind of pretreatment method for strengthening nitrogen extraction in landfill leachate

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0033] Pretreatment reactors such as figure 1 As shown, it includes a temperature control system 1, a jacketed conical reactor 2, an ultrasonic crushing probe 3, a reaction liquid bottle 4, a peristaltic pump 5, and an ultrasonic crusher host 6. The use method of the ultrasonic reaction device is as follows: put the village and town landfill leachate into the jacketed cone-shaped reactor 2; The reactors are closely connected; the temperature control system 1 is turned on to control the temperature of the jacketed conical reactor 2; when the ultrasound starts, the reaction dropwise addition system 4 is turned on, and the reaction solution enters the jacketed conical reaction by dropwise addition through the peristaltic pump Device 2, set the parameters of the peristaltic pump and ultrasonic conditions, and perform ultrasonic processing.

[0034] In this Example 1, the landfill leachate used was taken from a waste transfer station in a village and town in Huangshan City, Anhui ...

Embodiment 2

[0044] Ultrasonic pretreatment of leachate from a village and town garbage transfer station includes the following steps:

[0045] (1) Measure 500mL of landfill leachate from villages and towns, simply remove solid impurities such as leaves, plastics, and gravel, then filter through a 100-mesh sieve, and use 10mol / L NaOH solution and 1% sodium percarbonate solution Na 2 CO 3 ·1.5H 2 O 2 and 0.1%Na 2 C 2 O 4 solution, adjusted to pH 7.5, NaOH solution, sodium percarbonate solution and Na 2 C 2 O 4 The volume ratio of the solution was 70:3:1, the standing time was 24 hours, and after standing, it passed through a 30-micron filter membrane.

[0046] (2) ultrasonically treating the obtained landfill leachate for 1 h, using the same device as in Example 1, the ultrasonic frequency is 20 kHz, the ultrasonic reaction temperature is 75° C., the amplitude is 120 μm, the pulse mode is used, the pulse start time is 6 seconds, the pulse The stop time is 3 seconds.

[0047] (3) i...

Embodiment 3

[0051] Ultrasonic pretreatment of leachate from a village and town garbage transfer station includes the following steps:

[0052] (1) Measure 500mL of village and town landfill leachate, simply remove solid impurities such as leaves, plastics, and gravel, then filter through a 100-mesh sieve, and use 7mol / L NaOH solution and 1% sodium percarbonate solution Na 2 CO 3 ·1.5H 2 O 2 and 0.1%Na 2 C 2 O 4 solution, adjusted to pH 8, NaOH solution, sodium percarbonate solution and Na 2 C 2 O 4 The volume ratio of the solution was 7:3:1, the standing time was 8 hours, and after standing, it passed through a 30-micron filter membrane.

[0053] (2) ultrasonically treating the obtained landfill leachate for 0.1 h, using the same device as in Example 1, the ultrasonic frequency is 20 kHz, the ultrasonic reaction temperature is 65° C., the amplitude is 60 μm, the pulse mode is used, and the pulse start time is 4 seconds, The pulse stop time is 1 second.

[0054] (3) in the ultras...

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

No PUM Login to View More

Abstract

The invention discloses a pretreatment method for strengthening nitrogen extraction in landfill leachate, comprising: adjusting the pH of the landfill leachate to 7.5-8.5, then standing to pass through a membrane; then adding persulfate, ethylenediaminetetraacetic acid containing The reaction solution of disodium and ferrous sulfate was put into ultrasonic reaction treatment. The method of the invention can promote the conversion of nitrogen in the leachate to the reactive ammonium state, activate the reactivity of inorganic phosphorus in the leachate, shield the interference of impurities on the synthesis reaction of magnesium ammonium phosphate, and greatly improve the extraction efficiency of total nitrogen in the leachate. And improve the purity of the reaction product. The present invention has simple technical process and high reliability, and is suitable for village and town landfill leachate with different pollution loads.

Description

technical field [0001] The invention belongs to the field of environmental technology, and in particular relates to an ultrasonic pretreatment method for strengthening nitrogen extraction from leachate of village garbage transfer stations. Background technique [0002] In 2015, the annual output of domestic waste in villages and towns in my country was about 160 million tons. According to the "Technical Specification for Domestic Waste Leachate Treatment (CJJ150-2010)", the daily output of landfill leachate in villages and towns in my country is about 44,000 tons. Due to the high concentration of pollutants (COD, nitrogen and phosphorus nutrients, and other pollutants) in the landfill leachate of villages and towns, improper disposal will pollute the nearby soil and groundwater, threatening and harming the health of the population and the growth of surrounding crops. At the same time, extracting nitrogen from the leachate from the transfer station for return to the field ha...

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 Patents(China)
IPC IPC(8): C02F9/02C05B17/00C01B25/45
CPCC05B17/00C01B25/451C01P2006/80
Inventor 苏良湖谈超群盛天予孙可纯王赛尔赵志强张龙江宋宁慧刘杰戴昕
Owner NANJING INST OF ENVIRONMENTAL SCI MINIST OF ECOLOGY & ENVIRONMENT OF THE PEOPLES REPUBLIC OF CHINA