Method for treating aged landfill leachate by using mineralized sludge

A landfill leachate and sludge treatment technology, applied in water/sludge/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems restricting the development of old landfill leachate, and achieve low infrastructure costs, Widespread, easy-to-build effects

Inactive Publication Date: 2020-11-27
山东达源环保工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high concentration of ammonia nitrogen in the old landfill leachate will inhibit the nitrification, thus restricting the development of using new technologies to treat the old landfill leachate.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0027] The method for treating old landfill leachate with mineralized sludge specifically comprises the following steps:

[0028] (1) Pretreatment: adjust the pH value of the old landfill leachate to 7.0, the temperature is 28 ° C, and filter to remove suspended solids and large particle pollutants therein to obtain the pretreated old landfill leachate;

[0029] (2) Sludge treatment: add mineralized sludge to the pretreated old landfill leachate, the addition amount is 8g / L, then stir at a speed of 1200r / min for 3h, let stand for 1h, and discharge the supernatant;

[0030] (3) Advanced treatment: the supernatant is sequentially passed through with a flux of 50L / m 2 h. The external tubular ultrafiltration membrane with an operating pressure of 4bar is used for ultrafiltration treatment, and the flux is 12L / m 2 h. The recovery rate is 85%, and the roll-type polyamide composite membrane with an operating pressure of 10bar is used for nanofiltration treatment, and the flux is 10L...

Embodiment 2

[0032] The method for treating old landfill leachate with mineralized sludge specifically comprises the following steps:

[0033] (1) Pretreatment: adjust the pH value of the old landfill leachate to 6.0 and the temperature to 26°C, and filter to remove suspended solids and large particle pollutants therein to obtain the pretreated old landfill leachate;

[0034] (2) Sludge treatment: Add mineralized sludge to the pretreated old landfill leachate, the addition amount is 6g / L, then stir at a speed of 800r / min for 2h, let stand for 0.5h, and discharge the supernatant;

[0035] (3) Advanced treatment: the supernatant is sequentially passed through with a flux of 40L / m 2 h. The external tubular ultrafiltration membrane with an operating pressure of 3bar is used for ultrafiltration treatment, and the flux is 10L / m 2 h, the recovery rate is 80%, and the roll-type polyamide composite membrane with an operating pressure of 8bar is used for nanofiltration treatment, and the flux is 8L...

Embodiment 3

[0037] The method for treating old landfill leachate with mineralized sludge specifically comprises the following steps:

[0038] (1) Pretreatment: adjust the pH value of the old landfill leachate to 7.0 and the temperature to 30°C, and filter to remove suspended solids and large particle pollutants therein to obtain the pretreated old landfill leachate;

[0039] (2) Sludge treatment: add mineralized sludge to the pretreated old landfill leachate, the addition amount is 8g / L, then control the dissolved oxygen content to 1.5mg / L to aerate for 2h, let it stand for 1h, and discharge it Serum;

[0040] (3) Advanced treatment: the supernatant is sequentially passed through with a flux of 60L / m 2 h. The external tubular ultrafiltration membrane with an operating pressure of 5bar is used for ultrafiltration treatment, and the flux is 15L / m 2 h. The recovery rate is 90%, and the roll-type polyamide composite membrane with an operating pressure of 10bar is used for nanofiltration tre...

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PUM

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Abstract

The invention discloses a method for treating aged landfill leachate by using mineralized sludge, which specifically comprises the following steps of: (1) pretreatment: regulating the pH value and temperature of aged landfill leachate, and filtering the aged landfill leachate to remove suspended matters and large-particle pollutants in the aged landfill leachate, thereby obtaining pretreated agedlandfill leachate; (2) sludge treatment: adding mineralized sludge into the pretreated aged landfill leachate, then stirring or aerating, standing, and discharging supernatant; and (3) advanced treatment: sequentially carrying out ultrafiltration treatment, nanofiltration treatment and reverse osmosis treatment on the supernatant, and finally discharging the landfill leachate. Compared with an existing aged landfill leachate treatment method, the method has the advantages that the problems of high treatment cost and poor treatment effect of the aged landfill leachate are solved, an effective way is found for treatment of the aged landfill leachate, and the method completely conforms to the environment-friendly concept of treating waste with waste.

Description

technical field [0001] The invention relates to the technical field of environmental protection engineering, in particular to a method for treating aged landfill leachate by using mineralized sludge. Background technique [0002] With the development of the economy, the improvement of people's living standards and the acceleration of urbanization, the output of municipal solid waste in our country is increasing day by day. According to statistics, the per capita daily output of urban garbage in my country is 1.2-1.4kg, and the annual output of urban garbage in the country has reached more than 300 million tons, and it is increasing at an annual rate of 8%-10%, which is close to the level of industrially developed countries. At present, landfill treatment is still the most common treatment method in my country, but the leachate produced by landfill seriously pollutes groundwater and the surrounding environment. [0003] Landfill leachate, especially old landfill leachate, ge...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F101/30C02F103/06
CPCC02F9/00C02F1/66C02F1/441C02F1/442C02F1/444C02F1/001C02F3/34C02F7/00C02F2103/06C02F2101/30
Inventor 严希海原泽
Owner 山东达源环保工程有限公司
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