CN105036444B - Minimizing and recycling Treated sewage reusing Zero-discharge treating process - Google Patents
Minimizing and recycling Treated sewage reusing Zero-discharge treating process Download PDFInfo
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- CN105036444B CN105036444B CN201510587664.7A CN201510587664A CN105036444B CN 105036444 B CN105036444 B CN 105036444B CN 201510587664 A CN201510587664 A CN 201510587664A CN 105036444 B CN105036444 B CN 105036444B
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Abstract
The invention discloses a kind of minimizing and recycling Treated sewage reusing Zero-discharge treating process, including：（1）The softened pretreatment of raw water waste water, it is equal to reach calcium ions and magnesium ions concentration<100mg/l, total hardness<200mg/l；（2）Water outlet enters rolling RO diaphragms and carries out separation concentration for the first time, and production water collects reuse；（3）The concentrate water outlet of rolling RO diaphragms enters SuperRO systems and carries out second of concentration, and production water collects reuse；（4）The concentrate water outlet of SuperRO systems carries out curing crystallization treatment into vapo(u)rization system, and evaporation condensate collects reuse, remaining solid outward transport processing or landfill disposal.Existing Treated sewage reusing technique is improved the present invention is based on extraordinary membrane technology, bio-chemical effluent is concentrated twice by rolling RO diaphragms and SuperRO systems, substantially increase production water efficiency, and the increase for going out concentrated liquid concentration also reduces the intractability of vapo(u)rization system, significantly reduces the operating cost of each process.
Description
Technical field
The present invention relates to the useless processing technology field of dirt, returned in particular, referring to water in a kind of minimizing and recycling
Use Zero-discharge treating process.
Background technology
SL368-2006《Standard of reclaimed water》In to the regulations of recycled water purposes indices, except to conventional COD,
Outside the indexs such as coloration, SS require, also there is index request to TDS.
Conventional biochemistry+materializing strategy to a certain extent, can reduce the indexs such as CODcr and ammonia nitrogen in sewage, still
The dissolubility salt in sewage can not be removed.The reuse if this kind of water puts into production, even if initial stage salt index can meet reuse
It is required that as circulating and recovering number increases, salt accumulation cannot meet reuse water quality requirement.
Therefore, recycling of water resource reuse and zero-emission in fundamentally realizing, in addition to organic pollution, it is necessary to solve salt
Removal problem.The method that membrane technology uses physical separation has higher separation accuracy, is combined with evaporation technology, gradually quilt
For in Treated sewage reusing zero-emission.Since year ends 80, water treatment by membrane is widely applied in China, reverse osmosis
（Reverse Osmosis Membrane, abbreviation RO）It is exactly except one of water treatment by membrane technique of salt treatment process.It is reverse osmosis
It is that can only penetrate solvent using reverse osmosis membrane（Typically water）And the selective penetrated property of ionic species or small-molecule substance is retained, with
Film both sides static pressure is motive force, and the membrane process to liquid mixture separation realized.
Reverse osmosis is an important component of membrane separation technique, because with producing water water quality is high, operating cost is low, without dirt
Dye, it is easy to operate reliable many advantages, such as, and as the most energy saving, most of seawater and brackish water desalination and pure water preparation
Easy technology.It is widely used to all conglomeraties such as medicine, electronics, chemical industry, food, sea water desalination at present.
Conventional processing procedure is that the waste water after biochemical treatment is filtered using rolling RO, and RO producing water water qualities are excellent at present
It is different, most of industrial process waters standards, RO concentrates can be met（Concentrated water）By way of evaporation, by RO dopes salt residue,
Organic substance etc. is isolated in the form of solid waste from waste water.Since waste water passes through biochemical treatment, volatilizable content of organics is very low,
Therefore evaporation condensed water quality is also preferable, can meet most of industrial process waters standards.
Due to needing the middle water of reuse or zero-emission（Bio-chemical effluent）Water quality generally has following features：
1st, some Refractory organic compounds matter are remained, general CODCr is in 100 ~ 500mg/L；
2nd, the processing such as biochemistry+materialization are had already passed through, renewableization is poor；
3rd, the certain workshop sections of conventional treatment introduce foreign substance, and salinity is higher.
The reverse osmosis own structural characteristics of rolling, although with excellent desalting effect, antipollution is not high and operation is pressed
Power is limited, for general middle water, after more harsh pretreatment, can only achieve 55% ~ 65% rate of recovery, i.e., remaining
35% ~ 45% concentrate.And remaining concentrate will accomplish zero-emission, need to be evaporated processing, evaporation capacity is larger.
Evaporation technology there are the drawbacks of：It is with high investment（20000 yuan/ton of water, dual phase steel more than material）, high energy consumption（60 yuan/ton
Water.0.4 ton of fresh steam/ton water, 150 yuan/ton of fresh steam）.
Invention content
To overcome the above problem of the existing technology, the present invention provides a kind of high-efficiency environment friendly, operating cost low decrement
Change and recycling Treated sewage reusing Zero-discharge treating process.
To achieve these goals, the technical solution adopted by the present invention is as follows：
A kind of minimizing and recycling Treated sewage reusing Zero-discharge treating process, include the following steps：
（1）The softened pretreatment of raw water waste water, it is equal to reach calcium ions and magnesium ions concentration<100mg/l, total hardness<200mg/l；
（2）Water outlet enters rolling RO diaphragms and carries out separation concentration for the first time, and production water collects reuse；
（3）The concentrate water outlet of rolling RO diaphragms enters SuperRO systems and carries out second of concentration, and production water is collected back
With；
（4）The concentrate water outlet of SuperRO systems carries out curing crystallization treatment into vapo(u)rization system, and evaporation condensate is received
Collect reuse, remaining solid outward transport processing or landfill disposal.
Wherein, the step（1）In, the sludge that softening pretreatment generates is solidified into through sludge filter press at mud cake landfill
Reason, the clear liquid reflux pretreatment process of generation.
Specifically, the permeant flux of the rolling RO diaphragms is not less than 12.5L/m2H, the rate of recovery are not less than 70%.The volume
The membrane material of formula RO diaphragms is aromatic polyamide.
Specifically, the permeant flux of the SuperRO systems is not less than 19.8L/m2H, the rate of recovery are not less than 80%.It is described
The membrane material of SuperRO systems is modified aromatic polyamide.
Preferably, the vapo(u)rization system is triple effect forced circulation crystallizing evaporator.
Compared with prior art, the invention has the advantages that：
Existing Treated sewage reusing technique is improved the present invention is based on extraordinary membrane technology, by rolling RO diaphragms and
SuperRO systems concentrate bio-chemical effluent twice, substantially increase production water efficiency, and go out the increase of concentrated liquid concentration
The intractability of vapo(u)rization system is also reduced, significantly reduces the operating cost of each process, and present inventive concept is novel,
It is ingenious in design, it is easy to use, it is with a wide range of applications, is suitble to promote and apply.
Description of the drawings
Fig. 1 is the process flow chart of the present invention.
Specific embodiment
The invention will be further described with reference to the accompanying drawings and examples, and embodiments of the present invention include but not limited to
The following example.
Embodiment
As shown in Figure 1, the minimizing and recycling Treated sewage reusing Zero-discharge treating process, include the following steps：
（1）The softened pretreatment of raw water waste water, it is equal to reach calcium ions and magnesium ions concentration<100mg/l, total hardness<200mg/l；Its
Middle softening pretreatment includes pretreatment process before the films of some such as acid adding plus alkali, precipitation and pH readjustments, due to pretreatment herein
It can handle, therefore be repeated no more in the present embodiment in a conventional manner, the sludge generated is solidified into mud cake through sludge filter press
Landfill disposal, generate clear liquid reflux pretreatment process in use again；
（2）Water outlet enters rolling RO diaphragms and carries out separation concentration for the first time, realizes first time desalting processing, and production water is collected
Reuse, the membrane material of rolling RO diaphragms is aromatic polyamide, and permeant flux is not less than 12.5L/m2H, the rate of recovery be not low
In 70%；
（3）The concentrate water outlet of rolling RO diaphragms enters SuperRO systems and concentrate for the second time, at further desalination
Reason, production water collect reuse, and the membrane material of the SuperRO systems is modified aromatic polyamide, and permeant flux is not less than
19.8L/m2H, the rate of recovery are not less than 80%, so that the overall recovery of entire technique is not less than 94%, eventually for evaporation
The 7% of concentrate deficiency raw water amount；
（4）The concentrate water outlet of SuperRO systems carries out curing crystallization treatment into vapo(u)rization system, and evaporation condensate is received
Collect reuse, remaining solid outward transport processing or landfill disposal.
Preferably, the vapo(u)rization system is triple effect forced circulation crystallizing evaporator.Height of liquid level, the object of its different section
The evaporating temperature of stream amount and each effect is controlled with pressure within rational scope of design.According to feeding temperature using advanced three,
2nd, an effect preheating enters back into when temperature of charge is preheating to close to evaporating temperature and imitates separator by ball-cock assembly control liquid level one.This
Sample avoids material from increasing the burnt pipe phenomenon of generation suddenly because of temperature.The falling film evaporator that one effect uses is because of material initial concentration ratio
Relatively low, material concentration will not generate crystal plugging far below saturated concentration again after evaporation, so using falling film evaporator.Falling liquid film steams
Hair utensil, which has, concentrates the advantages such as fast；It is presently the most one of advanced evaporator.Material is put down by circulating pump after one effect vapor-liquid separation
It is advanced by ball-cock assembly control liquid level two, triple effect crystal separator.In addition using two-tube-pass forced-circulation evaporator, both ensure object
Stream speed reduces power of motor again.It is matched with DTB crystal separators, can realize ideal evaporation of the solvent, crystal growth, vapour
Liquid separation process.2nd, triple effect we use most advanced DTB crystal separators that can discharge with continuous crystallisation.2nd, triple effect is using pressure
Continuous crystallisation DTB separators are recycled, by controlling mother liquor inner recirculation flow amount and magma density, control crystalline growth speed can be reached
The purpose of rate, while wall can be avoided to scab phenomenon well；By controlling mother liquor outer circulation flow, heat transfer system can be adjusted
The degree of supersaturation of number and mother liquor, makes crystallization operation stable operation；DTB crystallizers have the function of clear mother liquor overflow, can be effective
Control crystal grain discharging.Be precipitated crystal by extend leg by discharge be pumped into crystallizing tank again crystallisation by cooling make more polycrystal analyse
Go out.
About solving the problems, such as plugging：Because using DTB crystallizers, recycle stock draws from DTB crystallizer spacer internal upper part nozzles
Go out, crystalline solid pellet, in settling phase, has the effect of clear mother liquor overflow, the crystal grain of large-size in spacer channel
It is not likely to enter in spacer, along with the fine crystal elimination effect of undersaturated feeding liquid and larger forced circulation flow velocity, substantially
On can be to avoid pipe plugging by crystallization problem.In addition the outer circulation import of crystallizer is located at low head, there is larger liquid level, can
Largely gasify in outer circulating line to avoid mother liquor.Another discharge port crystal plugging phenomenon, we are constantly recycled using discharging pump
Form makes crystal be maintained at discharge nozzle internal circulation flow, and circulation valve is automatically closed after solid-to-liquid ratio reaches requirement and opens discharging
Valve flows into crystallizing tank, and the another broken empty recoil device of installation makes crystal in crystallizer smoothly discharge.Equipment used in the present invention and
System is the prior art, is repeated no more.
The water treatment experiment of the present invention is carried out in certain unit, the related data of acquisition is as shown in table 1 below：
| Process | pH | Conductivity (μ s/cm) | Total hardness (mg/L) | Ca2+ (mg/L) | Cl- (mg/L) | COD (mg/L) |
| Pretreatment water outlet | 8.71 | 12000 | 444.5 | 190.97 | 2706.61 | 329.75 |
| Rolling RO diaphragms are discharged | 5.2 | 1400 | ND | 3.5 | 89.66 | 33.52 |
| SuperRO systems are discharged | 5.28 | ≤200 | ND | ND | 127.18 | 49.83 |
Table 1
By experiment it is found that the present invention has excellent effect on water treatment efficiency.
Above-described embodiment is merely a preferred embodiment of the present invention, and it is not intended to limit the protection scope of the present invention, as long as using
The design principle of the present invention and the variation for carrying out non-creative labour on this basis and making, should all belong to the present invention's
Within protection domain.
Claims (2)
1. minimizing and recycling Treated sewage reusing Zero-discharge treating process, which is characterized in that include the following steps：
(1) it is equal to reach calcium ions and magnesium ions concentration for the softened pretreatment of raw water waste water<100mg/L, total hardness<200mg/L, this is soft
Change pretreatment to include acid adding, alkali, precipitation and pH readjustments, the sludge generated is added to be solidified at mud cake landfill through sludge filter press
Reason, and the clear liquid that sludge filter press is generated flows back this pretreatment process；
(2) water outlet enters rolling RO diaphragms and carries out detaching concentration for the first time, and production water collects reuse, wherein the rolling RO diaphragms
Permeant flux be not less than 12.5L/ (m2﹒ h), the rate of recovery is not less than 70%, and the membrane material of rolling RO diaphragms is fragrance
Polyamide；
(3) the concentrate water outlet of rolling RO diaphragms enters SuperRO systems and concentrate for the second time, and production water collects reuse,
Described in SuperRO systems permeant flux be not less than 19.8L/ (m2﹒ h), the rate of recovery is not less than 80%, the SuperRO
The membrane material of system is modified aromatic polyamide；
(4) concentrate of SuperRO systems is discharged into vapo(u)rization system and carries out curing crystallization treatment, and evaporation condensate is collected back
With remaining solid outward transport processing or landfill disposal.
2. minimizing according to claim 1 and recycling Treated sewage reusing Zero-discharge treating process, which is characterized in that described
Vapo(u)rization system is triple effect forced circulation crystallizing evaporator.
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| JP6807219B2 (en) * | 2016-11-18 | 2021-01-06 | オルガノ株式会社 | Reverse osmosis membrane treatment system and reverse osmosis membrane treatment method |
| CN112850987A (en) * | 2021-01-27 | 2021-05-28 | 上海科保化工有限公司 | Zero-emission reclaimed water recycling system |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002143850A (en) * | 2000-11-15 | 2002-05-21 | Hitachi Zosen Corp | Wastewater treatment equipment |
| CN203741166U (en) * | 2014-03-19 | 2014-07-30 | 昆山晶科微电子材料有限公司 | Reclaimed water recycling system |
| CN104150718A (en) * | 2014-08-25 | 2014-11-19 | 成都美富特膜科技有限公司 | Zero-discharging technology in reclaimed water reuse |
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| CN101928087B (en) * | 2009-06-26 | 2011-12-28 | 中国石油化工股份有限公司 | Method for treating high salinity wastewater |
| CN103848514B (en) * | 2012-11-29 | 2017-04-12 | 上海乐泽环境工程有限公司 | High recovery rate and pollution resistance reverse osmosis membrane water treatment method |
| CN103833172B (en) * | 2014-03-13 | 2016-01-06 | 郭强 | A kind for the treatment of process of brine waste |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002143850A (en) * | 2000-11-15 | 2002-05-21 | Hitachi Zosen Corp | Wastewater treatment equipment |
| CN203741166U (en) * | 2014-03-19 | 2014-07-30 | 昆山晶科微电子材料有限公司 | Reclaimed water recycling system |
| CN104150718A (en) * | 2014-08-25 | 2014-11-19 | 成都美富特膜科技有限公司 | Zero-discharging technology in reclaimed water reuse |
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Address after: Jintang County of Chengdu City, Sichuan province 610000 Huai town Jintang Industrial Park Green Avenue Applicant after: Chengdu Environmental Protection Industry Group Co.,Ltd. Foote Address before: Jintang County of Chengdu City, Sichuan province 610000 Huai town Jintang Industrial Park Green Avenue Applicant before: CHENGDU MEIFUTE MEMBRANE TECHNOLOGY Co.,Ltd. |
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Effective date of registration: 20190114 Address after: 610404 No. 8 Wangjiatang Lane, Qingyang District, Chengdu City, Sichuan Province Patentee after: SICHUAN MEIFUTE ENVIRONMENT TREATMENT Co.,Ltd. Address before: 610000 environmental protection Avenue, Jintang Industrial Park, huaikou Town, Jintang County, Chengdu, Sichuan Patentee before: Chengdu Environmental Protection Industry Group Co.,Ltd. Foote |
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Address after: No. 22 Guanghua Road, Huaikou Street, Jintang County, Chengdu City, Sichuan Province, 610000 (within Jintang Industrial Park, Sichuan) Patentee after: Sichuan Meifeng Environmental Governance Co.,Ltd. Address before: 610404 No. 8 Wangjiatang Lane, Qingyang District, Chengdu City, Sichuan Province Patentee before: SICHUAN MEIFUTE ENVIRONMENT TREATMENT Co.,Ltd. |