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Landfill leachate stock solution pretreatment method and system for disc tube type reverse osmosis treatment

A disc-tube reverse osmosis and landfill leachate technology, which is applied in filtration treatment, water/sewage treatment, water treatment parameter control, etc., can solve the problems affecting the disc-tube reverse osmosis treatment of landfill leachate raw water, etc. effect of use

Inactive Publication Date: 2020-10-16
NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Aiming at the deficiencies of the prior art, the present invention provides a landfill leachate raw liquid treatment method and system for disc-tube reverse osmosis treatment, which can solve the problems encountered in the disc-tube reverse osmosis treatment of landfill leachate raw water

Method used

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  • Landfill leachate stock solution pretreatment method and system for disc tube type reverse osmosis treatment

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Embodiment 1

[0029] Adopt the present invention to treat the leachate raw water of a landfill site, COD=6000~8000mg / L, NH 3 -N=1500~2000mg / L, SS=500~1000mg / L; After the waste water passes through the sodium hypochlorite treatment unit, adjust the dosage of sodium hypochlorite to control the [·Cl] in the raw water of landfill leachate ≥ 0.3mg / L; The effluent passes through the PAC coagulation treatment unit (the dosage of PAC is 50-200g / m 3 , reaction time ≈20min), PAM flocculation treatment unit (1‰~5‰PAM dosage is controlled at 0.5~1L / m 3 , reaction time ≈20min), the SS in the effluent drops to ≤50mg / L, and the raw liquid of the landfill leachate becomes clearer; after passing through a sand filter with a particle size of quartz sand generally 0.5-1.0mm (the sand filter system is backwashed every 10d One time), the raw water of landfill leachate in the effluent SS<30mg / L enters the disc-type reverse osmosis system; the treated landfill leachate raw water enters the disc-type reverse osmo...

Embodiment 2

[0031] Adopt the method of the present invention to treat the leachate raw water of a landfill site, COD=4000~6000mg / L, NH 3 -N=1000~1500mg / L, SS=500~700mg / L, containing black colloidal substances; after the waste water is oxidized by sodium hypochlorite treatment unit, the black colloidal substances are oxidized and removed, and the raw water of landfill leachate is controlled [·Cl] ≈0.5mg / L; the effluent passes through the PAC coagulation treatment unit (the dosage of PAC is 50~100g / m 3 , reaction time ≈15min), PAM flocculation treatment unit (1‰~5‰PAM dosage is controlled at 0.5~0.8L / m 3 , reaction time ≈15min), the SS in the effluent is reduced to ≤40mg / L, after passing through the sand filter, the SS of the landfill leachate raw water is less than 25mg / L, and the water quality is clear; the landfill leachate raw water enters the disc tube after pretreatment Reverse osmosis system, the system is stable and normal operation, the water production rate of the system is incre...

Embodiment 3

[0033] Adopt the method of the present invention to process the leachate stoste of a landfill site, COD=7500~10000mg / L, NH 3 -N=1500~3000mg / L, SS=700~1500mg / L; After the raw water of landfill leachate is oxidized by sodium hypochlorite treatment unit, the odor in the raw water will be removed to a certain extent, and the [·Cl]≈0.5 in the landfill leachate stock solution will be maintained. mg / L, NH in raw water 3 -N drops to 1300~2500mg / L; the effluent of the sodium hypochlorite treatment unit passes through the PAC coagulation treatment unit (the dosage of PAC is 100~200g / m 3 , reaction time ≈30min), PAM flocculation treatment unit (1‰~5‰PAM dosage is controlled at 1.0~2.0L / m 3 , reaction time ≈30min), the SS in the effluent is reduced to ≤60mg / L, after passing through the sand filter, the SS of the landfill leachate raw water is less than 30mg / L; the landfill leachate raw water is pretreated and enters the disc tube reverse osmosis system , the system runs stably and norma...

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Abstract

The invention discloses a landfill leachate stock solution pretreatment method and system for disc tube type reverse osmosis treatment. The landfill leachate stock solution pretreatment method comprises the following steps: 1, adding a sodium hypochlorite solution into a landfill leachate stock solution, 2, adding a PAC solution into the effluent obtained in the step 1, 3, adding a PAM solution into the effluent obtained in the step 2, allowing bottom precipitates to enter a precipitate compression treatment unit, and allowing supernatant to enter the next step, step 4, adding a sodium sulfitesolution into the supernatant, and 5, carrying out sand filtration treatment on the effluent obtained in the step 4. The system comprises various targeted treatment units and a corresponding monitoring and pumping system, and can effectively remove various substances influencing a subsequent disc tube type reverse osmosis system, by monitoring the landfill leachate stock solution, the dosage of each medicament can be changed according to the change of the landfill leachate raw water, so that the pretreatment system can normally work under a wide landfill leachate water quality fluctuation condition.

Description

technical field [0001] The invention relates to the technical field of landfill leachate stock solution treatment, in particular to a landfill leachate stock solution treatment method and system for disc tube reverse osmosis treatment. Background technique [0002] Disc tube reverse osmosis is widely used in the treatment of brine, landfill leachate, and various industrial wastewater. In the treatment process of landfill leachate raw water, disc tube reverse osmosis can be directly used for landfill leachate raw water treatment because of its high pressure resistance and strong anti-pollution performance. Disc-type reverse osmosis directly processes landfill leachate stock solution. Various impurities contained in landfill leachate stock solution exist and have not been effectively removed. These colloids and suspended matter enter the disc-tube reverse osmosis system and tend to block The waste water channel affects the normal operation of the disc-tube reverse osmosis sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F103/06
CPCC02F9/00C02F1/001C02F1/441C02F1/5236C02F1/56C02F2103/06C02F2209/04C02F1/76
Inventor 刘军孙少龙高兴旺刘彦奎王英惠韩珊珊刘健王艳朋
Owner NANJING WONDUX ENVIRONMENTAL PROTECTION TECH CO LTD