CN105036444A - Reduction and reclamation recycled water reuse zero emission treating technology - Google Patents
Reduction and reclamation recycled water reuse zero emission treating technology Download PDFInfo
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- CN105036444A CN105036444A CN201510587664.7A CN201510587664A CN105036444A CN 105036444 A CN105036444 A CN 105036444A CN 201510587664 A CN201510587664 A CN 201510587664A CN 105036444 A CN105036444 A CN 105036444A
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Abstract
The invention discloses a reduction and reclamation recycled water reuse zero emission treating technology. The reduction and reclamation recycled water reuse zero emission treating technology comprises the steps that firstly, softening pretreatment is carried out on raw water waste water, and it is achieved that the concentration of calcium and magnesium ions is smaller than 100 mg/l, and the total hardness is smaller than 200 ml/l; secondly, outlet water enters a roll type RO membrane device to carry out first-time separation and concentration, and produced water of the outlet water is collected and reused; thirdly, concentration solution outlet water of the roll type RO membrane device enters a SuperRo system to carry out second-time concentration, evaporation condensate of the concentration solution outlet water is collected and reused, and the residual solid is transported out to be treated or treated in a landfill mode. An existing recycled water recycling technology is improved based on the special membrane technology, two times of concentration is carried out on biochemical outlet water through the roll type RO membrane device and the SuperRo system, the water producing efficiency is greatly improved, the treatment difficulty of an evaporation system is also lowered due to the fact that the concentration of the outlet water concentration liquid is increased, and the operation cost of all procedures is effectively reduced.
Description
Technical field
The present invention relates to dirty useless processing technology field, specifically, what relate to is a kind of minimizing and resource utilization Treated sewage reusing Zero-discharge treating process.
Background technology
Regulation to reuse water purposes indices in SL368-2006 " Standard of reclaimed water ", except the indexs such as the COD to routine, colourity, SS have requirement, also has index request to TDS.
Conventional biochemistry+materializing strategy, to a certain extent, can reduce the indexs such as CODcr in sewage and ammonia nitrogen, but cannot remove the solvability salt in sewage.The reuse if this kind of water puts into production, even if initial stage salt index can meet reuse requirement, along with cyclically utilizing number of times increases, salt accumulation can not meet reuse water quality requirement.
Therefore, recycling of water resource reuse and zero release in fundamentally realizing, except organic pollutant, also must solve the removal problem of salt.Membrane technique adopts the method for physical sepn, has higher separation accuracy, combines with evaporation technology, be used to gradually in Treated sewage reusing zero release.From at the end of 80, water treatment by membrane is widely applied in China, and reverse osmosis (ReverseOsmosisMembrane is called for short RO) is exactly one of water treatment by membrane technique removing salt treatment process.Reverse osmosis is the selective penetrated property utilizing reverse osmosis membrane can only retain ionic species or small-molecule substance through solvent (normally water), with film both sides static pressure for impellent, and the membrane process that liquid mixture is separated realized.
Reverse osmosis is an important component part of membrane separation technique, produce that water water quality is high, running cost is low because having, pollution-free, the easy to operate plurality of advantages such as reliable, and become seawater and brackish water desalination, and energy-conservation, the easiest technology of pure water preparation.All conglomeraties such as medicine, electronics, chemical industry, food, sea water desaltination are widely used at present.
The treating processes of current routine is, waste water after biochemical treatment, rolling RO is adopted to filter, RO produces water water quality excellence, most industry water of productive use standard can be met, RO dope salt residue, organic substance etc., by the mode of evaporation, are isolated from waste water with the form of solid waste by RO concentrated solution (dense water).Because waste water is through biochemical treatment, volatilizable organic content is very low, and therefore evaporation condensed water quality is also better, can meet most industry water of productive use standard.
Generally there is following features owing to needing water (bio-chemical effluent) water quality in reuse or zero release:
1, more residual Refractory organic compounds matter, general CODCr is at 100 ~ 500mg/L;
2, passed through the process such as biochemistry+materialization, renewable voltinism is poor;
3, some workshop section of conventional processing introduces foreign matter, and salinity is higher.
Rolling reverse osmosis own structural characteristics, although have excellent desalting effect, antipollution is not high and working pressure is limited, for water in general, after comparatively harsh pre-treatment, the rate of recovery of 55% ~ 65% can only be reached, namely remain the concentrated solution of 35% ~ 45%.And remaining concentrated solution will accomplish zero release, need to carry out evaporation process, steam output is larger.
The drawback that evaporation technology exists: (20,000 yuan/ton of water, the above material of dual phase steel) with high investment, high energy consumption (60 yuan/ton of water.0.4 ton of fresh steam/ton water, 150 yuan/ton of fresh steam).
Summary of the invention
For overcoming the problems referred to above that prior art exists, the invention provides the low minimizing of a kind of high-efficiency environment friendly, running cost and resource utilization Treated sewage reusing Zero-discharge treating process.
To achieve these goals, the technical solution used in the present invention is as follows:
A kind of minimizing and resource utilization Treated sewage reusing Zero-discharge treating process, comprise the steps:
(1) former water waste water is through softening pre-treatment, reaches the equal <100mg/l of calcium ions and magnesium ions concentration, total hardness <200mg/l;
(2) water outlet enters rolling RO film device and carries out first time and be separated concentrated, and it produces water and collects reuse;
(3) the concentrated solution water outlet of rolling RO film device enter SuperRO system carry out second time concentrate, its produce water collect reuse;
(4) the concentrated solution water outlet of SuperRO system enters vapo(u)rization system and is cured crystallization treatment, and its evaporation condensate collects reuse, remaining solid outward transport process or landfill disposal.
Wherein, in described step (1), the mud that softening pre-treatment produces is solidified into mud cake landfill disposal through sludge filter press, the clear liquid backflow pretreatment process of generation.
Particularly, the permeant flux of described rolling RO film device is not less than 12.5L/m
2h, the rate of recovery is not less than 70%.The membrane material of described rolling RO film device is aromatic polyamide.
Particularly, the permeant flux of described SuperRO system is not less than 19.8L/m
2h, the rate of recovery is not less than 80%.The membrane material of described SuperRO system is modified aromatic polyamide.
As preferably, described vapo(u)rization system is triple effect pump circulation crystallizing evaporator.
Compared with prior art, the present invention has following beneficial effect:
The present invention is based on special membrane technology to improve existing Treated sewage reusing technique, carry out twice by rolling RO film device and SuperRO system to bio-chemical effluent to concentrate, substantially increase and produce water efficiency, and the increase going out concentrated liquid concentration also reduces the intractability of vapo(u)rization system, significantly reduce the running cost of each operation, and the present invention is novel, design ingenious, be simple and easy to use, be with a wide range of applications, be applicable to applying.
Accompanying drawing explanation
Fig. 1 is process flow sheet of the present invention.
Embodiment
Below in conjunction with drawings and Examples, the invention will be further described, and embodiments of the present invention include but not limited to the following example.
Embodiment
As shown in Figure 1, this minimizing and resource utilization Treated sewage reusing Zero-discharge treating process, comprise the steps:
(1) former water waste water is through softening pre-treatment, reaches the equal <100mg/l of calcium ions and magnesium ions concentration, total hardness <200mg/l; Wherein softening pre-treatment comprise acid adding, add alkali, pretreatment process before some the film such as precipitation and pH readjustment, because pre-treatment herein can process in a conventional manner, therefore repeat no more in the present embodiment, its mud produced is solidified into mud cake landfill disposal through sludge filter press, uses in the clear liquid backflow pretreatment process that it produces again;
(2) water outlet enters rolling RO film device and carries out first time and be separated concentrated, and realize first time desalting treatment, it produces water and collects reuse, and the membrane material of this rolling RO film device is aromatic polyamide, and its permeant flux is not less than 12.5L/m
2h, the rate of recovery is not less than 70%;
(3) the concentrated solution water outlet of rolling RO film device enter SuperRO system carry out second time concentrate, further desalting treatment, its produce water collect reuse, the membrane material of this SuperRO system is modified aromatic polyamide, and its permeant flux is not less than 19.8L/m
2h, the rate of recovery is not less than 80%, thus makes the total yield of whole technique be not less than 94%, 7% of the former water yield that the concentrated solution finally for evaporating is not enough;
(4) the concentrated solution water outlet of SuperRO system enters vapo(u)rization system and is cured crystallization treatment, and its evaporation condensate collects reuse, remaining solid outward transport process or landfill disposal.
As preferably, described vapo(u)rization system is triple effect pump circulation crystallizing evaporator.The vaporization temperature of the height of liquid level of its different section, mass flow and each effect and pressure-controlling are within rational scope of design.Adopt advanced three, two, one effect preheating according to feeding temperature, temperature of charge is preheating to and imitates separator close to entering again during vaporization temperature by float(ing)valve control liquid level one.Avoid material Yin Wendu to raise suddenly like this and produce burnt pipe phenomenon.The falling-film evaporator that one effect adopts is because material starting point concentration is lower, and after evaporation, material concentration can not produce crystal plugging far below saturation concentration again, so adopt falling-film evaporator.Falling-film evaporator has the concentrated advantage such as fast; It is one of vaporizer of advanced person the most at present.After one effect vapor-liquid separation, material controls liquid level two, triple effect crystal separator by parallel the entering of recycle pump by float(ing)valve.Adopt two-tube-pass pump feed evaporator in addition, not only ensure material flow but also reduce power of motor.Match with DTB crystal separator, the solvent evaporation that can realize ideal, crystal growth, vapor-liquid separation process.Two, triple effect we adopt most advanced DTB crystal separator can continuous crystallisation discharging.Two, triple effect adopts pump circulation continuous crystallisation DTB separator, by controlling mother liquor internal recycle flow and magma density, can reach the object of crystallization control growth velocity, and wall can be avoided well to scab phenomenon simultaneously; By controlling mother liquor outer circulation flow, the degree of supersaturation of heat transfer coefficient and mother liquor can be regulated, make crystallization operation steady running; Draft tube baffle crystallizer possesses the function of mother liquor overflow clearly, can effectively control crystal grain discharging.Crystallize out by extend leg by discharging pump send into crystallizer again crystallisation by cooling make more polycrystal separate out.
About solution plugging problem: because adopting draft tube baffle crystallizer, recycle stock is drawn from the draft tube baffle crystallizer spacer internal upper part mouth of pipe, an xln material is in settling phase in spacer passage, there is the effect of mother liquor overflow clearly, the crystal grain of large-size can not enter in spacer, add the thin brilliant eliminating effect of undersaturated feeding liquid and larger pump circulation flow velocity, substantially can avoid pipe plugging by crystallization problem.The outer circulation import of crystallizer is located at lower cover in addition, and it has larger liquid level, can avoid the mother liquor interior a large amount of gasification of circulating line outside.Another discharge port crystal plugging phenomenon, we adopt the continuous circulation form of discharging pump, make crystal remain on discharge nozzle internal circulation flow, after solid-to-liquid ratio reaches requirement, automatically close circulation valve open discharge valve inflow crystallizer, broken empty backflush device is separately installed and makes the smooth discharging of crystal in crystallizer.The equipment used in the present invention and system are prior art, repeat no more.
Carry out water treatment experiment of the present invention in certain unit, the related data of acquisition is as shown in table 1 below:
| Operation | pH | Electric conductivity (μ s/cm) | Total hardness (mg/L) | Ca2+ (mg/L) | Cl- (mg/L) | COD (mg/L) |
| Pre-treatment water outlet | 8.71 | 12000 | 444.5 | 190.97 | 2706.61 | 329.75 |
| The water outlet of rolling RO film device | 5.2 | 1400 | ND | 3.5 | 89.66 | 33.52 |
| The water outlet of SuperRO system | 5.28 | ≤200 | ND | ND | 127.18 | 49.83 |
Table 1
Known by testing, the present invention has excellent effect on water treatment efficiency.
Above-described embodiment is only the preferred embodiments of the present invention, not limiting the scope of the invention, as long as adopt principle of design of the present invention, and the change carried out non-creativeness work on this basis and make, all should belong within protection scope of the present invention.
Claims (7)
1. minimizing and a resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, comprise the steps:
(1) former water waste water is through softening pre-treatment, reaches the equal <100mg/l of calcium ions and magnesium ions concentration, total hardness <200mg/l;
(2) water outlet enters rolling RO film device and carries out first time and be separated concentrated, and it produces water and collects reuse;
(3) the concentrated solution water outlet of rolling RO film device enter SuperRO system carry out second time concentrate, its produce water collect reuse;
(4) the concentrated solution water outlet of SuperRO system enters vapo(u)rization system and is cured crystallization treatment, and its evaporation condensate collects reuse, remaining solid outward transport process or landfill disposal.
2. minimizing according to claim 1 and resource utilization Treated sewage reusing Zero-discharge treating process, it is characterized in that, in described step (1), the mud that softening pre-treatment produces is solidified into mud cake landfill disposal through sludge filter press, the clear liquid backflow pretreatment process of generation.
3. minimizing according to claim 1 and resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, the permeant flux of described rolling RO film device is not less than 12.5L/m
2h, the rate of recovery is not less than 70%.
4. minimizing according to claim 3 and resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, the membrane material of described rolling RO film device is aromatic polyamide.
5. minimizing according to claim 1 and resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, the permeant flux of described SuperRO system is not less than 19.8L/m
2h, the rate of recovery is not less than 80%.
6. minimizing according to claim 5 and resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, the membrane material of described SuperRO system is modified aromatic polyamide.
7. the minimizing according to any one of claim 1 ~ 6 and resource utilization Treated sewage reusing Zero-discharge treating process, is characterized in that, described vapo(u)rization system is triple effect pump circulation crystallizing evaporator.
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Cited By (2)
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| CN109906204A (en) * | 2016-11-18 | 2019-06-18 | 奥加诺株式会社 | 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 |
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| CN112850987A (en) * | 2021-01-27 | 2021-05-28 | 上海科保化工有限公司 | Zero-emission reclaimed water recycling system |
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