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Method for treating waste water containing low concentration ammonium chloride

A treatment method, the technology of ammonium chloride, applied in the direction of heating water/sewage treatment, osmosis/dialysis water/sewage treatment, etc., can solve the problems of incomplete discharge, increase of potassium permeation, high cost, etc., and achieve resource utilization Utilization and clean production, solving environmental problems, and low operating costs

Inactive Publication Date: 2004-04-28
山东鲁南化工科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

However, these methods not only increase the complexity of the operation, but also can only save part of the water, and cannot completely solve the discharge problem; for example, water used as a regenerant not only reduces the exchange capacity of the resin, but also increases the permeation of potassium, resulting in increased consumption and by-products. The quality of ammonium chloride has declined; direct evaporation crystallization is not only a large investment but also high consumption and cost, and has no economic value, so it has not been fundamentally solved

Method used

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  • Method for treating waste water containing low concentration ammonium chloride
  • Method for treating waste water containing low concentration ammonium chloride

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Effect test

Embodiment 1

[0029] (1) Quality recovery of water: the ammonium chloride waste water produced in the potassium salt production system is divided into 0.01%~0.1%, 0.1%~0.4%, 0.1%~0.4% and 2% ~ 4%, ≥ 5.5% four kinds of water quality, collect waste water of the same water quality, mix them separately; use 0.1% ~ 0.4% low concentration wastewater ultrafiltration (or microfiltration) device 3 and 2% ~ 4% high concentration wastewater ultrafiltration The filtration (or microfiltration) device 12 pre-treats the wastewater to reduce the pollution of the reverse osmosis membrane.

[0030] (2) Reverse osmosis membrane concentration treatment of ammonium chloride wastewater, purified water reuse: the above-mentioned wastewater with a concentration of 0.01% to 0.1%, condensed water from the evaporation system and medium-pressure reverse osmosis 6, 8 out of purified water into low-pressure reverse osmosis The device 9 is uniformly processed, and the operating pressure is 1.3Mpa; the concentration is 0....

Embodiment 2

[0033]Water separation and recovery: the ammonium chloride wastewater generated in the potassium salt production system is divided into 0.01%~0.1%, 0.1%~0.4%, 2%~ 4%, ≥5.5% four kinds of water quality, collect the waste water of the same water quality, mix respectively; Adopt two sets of ultrafiltration (or microfiltration) devices to pretreat the waste water to reduce the pollution of the reverse osmosis membrane. Wherein, the two sets of ultrafiltration devices are 0.1%-0.4% low-concentration wastewater ultrafiltration device 3 and 2%-4% high-concentration wastewater ultrafiltration device 12 . The separated ammonium chloride wastewater enters the reverse osmosis membrane for concentration treatment.

[0034] Medium-pressure reverse osmosis devices 6 and 8 are divided into two stages of treatment, that is, for NH 4 Wastewater with a CL concentration of about 0.1% is treated by the first stage of reverse osmosis6, and the design recovery rate is about 80%. After this stage o...

Embodiment 3

[0039] The ammonium chloride wastewater with a concentration of about 0.1% is concentrated to 0.4-0.5% by the low-pressure reverse osmosis device 9, and the purified water is returned to the production system as process pure water for reuse (if it is necessary to improve the quality of the purified water, it can be considered to add a low-pressure or super low pressure reverse osmosis unit). Concentrated water can be used for other process treatment.

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Abstract

The treating process of waste water containing low concentration ammonium chloride includes the following steps: separating water and recovering, reverse penetrating film concentrating treatment of waste water containing ammonium chloride and reusing of purified water, concentrating water via evaporation to recover ammonium chloride and returning condensated water to membrane system for retreatment. The present invention has low power consumption, low production cost and technological advance, and can produce purified water reaching industrial pure water indexes and recover ammonium chloride completely.

Description

(1) Technical field [0001] The invention relates to a method for treating wastewater, in particular to a method for treating wastewater containing low-concentration ammonium chloride. (2) Background technology [0002] Aiming at the problem of the treatment of low-concentration ammonium chloride-containing wastewater produced in the production process of the potassium salt industry, it is an urgent problem that the industry faces. Due to the low-concentration ammonium chloride wastewater produced in the production process of the potassium salt industry, the average concentration of ammonium chloride is below 4%, which has no economic recovery value, so the treatment of these low-concentration ammonium chloride wastewater has become a very difficult problem. Problem: If it is directly discharged, it will not only cause huge environmental pollution, but also cause a huge waste of water resources and raw materials, causing huge damage to the social environment and the living en...

Claims

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Application Information

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IPC IPC(8): C02F1/04C02F1/44
Inventor 娄兰亭吴永国张宗华李冬冬徐可喜
Owner 山东鲁南化工科技有限公司
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