CN204237668U - A kind of energy-saving sewage factory secondary biochemical effluent desalting system - Google Patents
A kind of energy-saving sewage factory secondary biochemical effluent desalting system Download PDFInfo
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- CN204237668U CN204237668U CN201420740423.2U CN201420740423U CN204237668U CN 204237668 U CN204237668 U CN 204237668U CN 201420740423 U CN201420740423 U CN 201420740423U CN 204237668 U CN204237668 U CN 204237668U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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- Y02A20/124—Water desalination
- Y02A20/131—Reverse-osmosis
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Abstract
A kind of energy-saving sewage factory secondary biochemical effluent desalting system, this system comprises just permeates salt concentrating unit and multiple-effect evaporator, just permeate salt concentrating unit and comprise the airtight commuting case of FO film, draw liquid recycle device and clean water recovery device, the airtight commuting case of FO film at least arranges one-level, draw liquid recycle device to be connected respectively by electrically operated valve with the airtight commuting case of FO films at different levels, clean water recovery device with draw liquid recycle device and be connected, the airtight commuting case of FO films at different levels is connected by discharge opeing electrically operated valve successively, and be all connected with mother liquor multiple-effect evaporator by surmounting electrically operated valve.This system is for the high osmotic pressure characteristic of Sewage Plant secondary biochemical effluent, by preparation colligative property higher draw liquid, the permeable pressure head utilizing colligative property of solution difference to bring, recycle and reuse water resources while making Sewage Plant secondary biochemical effluent obtain efficient concentration, produces electric energy; Operational process realizes automatic interlock and controls, can according to different flow condition adjust operation mode.
Description
Technical field
The utility model relates to a kind of desalting system for Sewage Plant secondary biochemical effluent, belongs to sewage deep Treatment process field.
Background technology
Natural salt circulation is that carrier carries out with water cycle, and water cycle is prevalent in the links of vital process and activity in production, and the excessive increase of certain link salinity works the mischief to the life and health of the mankind, activity in production or ecotope.Investigation finds, the immediate offshore areas such as the many inland rivers of China, lake and the Bohai Sea, and salt index presents the trend continuing to rise.
Salinity in current sewage is mainly derived from the industrial production directly utilizing seawater, domestic water and food-processing, salt chemical engineering, fine chemistry industry, petrochemical complex, papermaking, leather processing, the industry such as synthetic ammonia and heat power plant, and in sewage disposal, salinity (mainly chlorine, sodium and boron) be usually difficult to effectively be removed, so (also claim reuse water in sewage discharge or Treated sewage reusing, its water quality is between sewage and tap water, it is municipal effluent, waste water is up to state standards after purifying treatment, the undrinkable water that can use within the specific limits) time, salinity is recycled in environment for use together with water, and then produce a series of harm, mainly comprise the following aspects:
(1) corroding metal pipeline and equipment, affects waste water conveying and treatment facility life-span;
(2) affect water ecological setting, certain influence is caused to hydrobiont;
(3) can the soil salinization be caused for irrigating, suppressing plant-growth even to cause it dead;
(4) be by under ooze polluted underground water.
Cause water body salinity to rise overally and mainly contain the factor of the following aspects:
One is the overall control lacked in national existing Water Environment Standards system total salt quantity (summation of all kinds of saliferous factor), although define individually as the salt index of muriate and so in part industry standard, but the efflux wastewater of quite a few industry and clear clean lower water outward and control overflow is not proposed to total salt quantity, cause enterprise all not give enough attention to the salinity in waste discharge in process choice and wastewater treatment process, even take the measure increasing salinity.
Two is because COD, ammonia nitrogen index carry out overall control and the assessment for cleaner production carried out energetically, make enterprise increase the dynamics of water saving and Treated sewage reusing, improve water circulation use rate, result causes water displacement to reduce, recirculated water salt accumulation, in waste discharge, salt concentration increases.In the waste water of Some Enterprises as peace and quiet lower water discharge, although COD concentration is not high, total salt quantity Pollutant levels are very high, and even indivedual enterprise is more than 10000mg/L.
Three is in order to satisfied national emission reduction tasks and quality of water environment improve demand, has formulated a series of strict pollution discharge standard in recent years.Enterprise, in order to the qualified discharge of the composite targets such as COD, adds the chemical reagent such as too much flocculation agent, acid, alkali in sewage treatment process, result also in increasing of salt concentration in efflux wastewater.
At present, constantly perfect along with national Water Environment Standards system, progressively strict to the overall control of total salt quantity, the flourishing province of part is as Shandong, in existing four basin provincial standards, add total salt quantity index, new standard modification list required: from 1 day May in 2014, and total salt quantity index limits performs the requirement of 3000mg/L; On January 1st, 2016 rises, and total salt quantity index limits performs the requirement of 1600mg/L; With the enterprise that middle water or recirculated water are main water source, total salt quantity index limits is loosened to 2000mg/L; General surface water body economizes control section water quality using total salt quantity l000mg/L as reference control objectives, and the city in district that establishes exceeding this target value can propose stricter requirement local to waste discharge.
As can be seen here, the desalination of Sewage Plant sewage has been trend of the times.Chinese patent literature CN103708644A disclosed " a kind of for the deep treatment method of the synchronous dephosphorization of secondary biochemical effluent except COD ", CN103787525A disclosed " a kind of method of municipal effluent secondary biochemical effluent advanced treatment ", CN103803696A disclosed " a kind of method of paper waste secondary biochemical effluent degree of depth decolouring " and CN102491560B disclosed " method and system for the process of vitamins C secondary biochemical effluent and reuse " all do not relate to secondary biochemical effluent except Ficus caricaL.
CN102390879B disclosed " in a kind of selective removal secondary biochemical effluent simultaneously nitrate and phosphatic method ", the steps include: the mixing solutions simultaneously containing nitrate, phosphoric acid salt and other solvability counter anions by being equipped with polyvinyl pyridine transition metal complex and the double-deck ADSORPTION IN A FIXED BED post of strongly basic anion exchange resin, wherein polyvinyl pyridine transition metal complex is above adsorption column, and strongly basic anion exchange resin is in the below of adsorption column; To adsorb nitrate and phosphatic adsorption column carries out desorption by sodium chloride brine, after desorption, adsorption column can be recycled.The method can only remove lower concentration nitrate and phosphoric acid salt in secondary effluent from sewage treatment plant, complex technical process.
For this reason, be necessary on the basis of Sewage Plant secondary biochemical, analyze the saliferous characteristic of Sewage Plant secondary biochemical effluent, utilize osmosis, develop energy-conservation, efficient Sewage Plant secondary biochemical effluent treatment technology.
Osmosis be the solution of two kinds of different concns every with semi-permeable membranes (allow solvent molecule pass through, do not allow the film that solute molecule passes through), water molecules or other solvent molecule to enter the phenomenon highly concentrated solution by semi-permeable membranes from the solution of lower concentration.Its condition occurred has two: one to be have semi-permeable membranes, and two is that semi-permeable membranes both sides have substance withdrawl syndrome poor.
Osmosis can be divided into again just permeates (FO), reverse osmosis (RO) and pressure damping infiltration (PRO).
(FO) process of just permeating is for motivating force with the permeable pressure head of semi-permeable membranes both sides, water molecules in solution is transmitted to low water chemistry gesture district (high ion concentration solution) from high water chemistry gesture district (low ion concns solution) by semi-permeable membranes, and solute molecule or ion are by a kind of process of osmosis stopped.
Reverse osmosis (RO) process is a kind of is impellent with pressure difference, isolates the membrane sepn operation of solvent from solution.Because it is contrary with the direction just permeated, therefore claims reverse osmosis.The osmotic pressure difference of different material can be utilized, use the reverse osmosis pressure being greater than osmotic pressure, reach separation, extraction, purifying and concentrated object.
Pressure damping infiltration (PRO) is between just permeating the pilot process with reverse osmosis process, refers to and apply pressure in the opposite direction of permeable pressure head, similar to reverse osmosis process, but water molecules remains and is diffused into high ion concentration side, similar to positive process of osmosis.
The colligative property of dilute solution (comprising Sewage Plant secondary biochemical effluent) refers to the numerical value of the vapor pressure lowering of solvent in dilute solution, depression of the freezing point, the elevation of boiling point and osmotic pressure, only relevant with the amount of solute in solution, have nothing to do with the person's character of solute, colligative property of solution draws liquid for exploitation special type and provides theoretical foundation, as long as namely configuration is necessarily colligative draw liquid, make its osmotic pressure higher than treatment sewage factory secondary biochemical effluent, utilize osmosis particularly just to permeate (FO), just Sewage Plant secondary biochemical effluent can be concentrated further.
For this reason, need energy-conservation, the efficient Sewage Plant secondary biochemical effluent desalting system of exploitation badly, osmosis is utilized especially just to permeate the permeable pressure head that (FO) acts on and colligative property of solution difference is brought, realize that Sewage Plant secondary biochemical effluent is effectively disposed, while recycle water resources, make full use of the pressure reduction acquisition electric energy just permeating (FO) and produce, save energy.
Summary of the invention
The deficiency that the utility model exists for existing Sewage Plant secondary biochemical effluent desalination technology, according to the saliferous characteristic of secondary biochemical effluent, utilizes colligative property of solution, the Sewage Plant secondary biochemical effluent treatment system providing a kind for the treatment of effect good, energy-conservation.There is provided this system a kind of to the treatment process of Sewage Plant secondary biochemical effluent simultaneously.
Energy-saving sewage factory of the present utility model secondary biochemical effluent desalting system, by the following technical solutions:
This system, comprise and just permeate salt concentrating unit and mother liquor (or claiming concentrated solution) multiple-effect evaporator, just permeating salt concentrating unit to comprise the airtight commuting case of FO film, draw liquid recycle device and clean water recovery device, the airtight commuting case of FO film at least arranges one-level, draw liquid recycle device to be connected respectively by electrically operated valve with the airtight commuting case of FO films at different levels, clean water recovery device with draw liquid recycle device and be connected, the airtight commuting case of FO films at different levels is connected by discharge opeing electrically operated valve successively, and is all connected with mother liquor multiple-effect evaporator by surmounting electrically operated valve.
The inside of the airtight commuting case of FO film arranges membrane element, and airtight for FO film commuting case inside is divided into mother liquor district and draws liquid zone by membrane element, and the top in mother liquor district is provided with water inlet pipe, this water inlet pipe is provided with into water electrically operated valve; In the airtight commuting case of upper level FO film, the bottom in mother liquor district is connected with the top in mother liquor district in the airtight commuting case of next stage FO film by discharge opeing electrically operated valve, and in every airtight commuting case of one-level FO film, the bottom in mother liquor district is all connected with mother liquor multiple-effect evaporator by surmounting electrically operated valve simultaneously; The top of drawing liquid zone in the airtight commuting case of every one-level FO film is connected with the liquid commuting case that draws drawn in liquid recycle device respectively by drawing liquid transfer lime, respective draw liquid transfer lime is provided with draw liquid outlet electric valve door; The bottom of drawing liquid zone in the airtight commuting case of every one-level FO film is provided with draws liquid compensation electrically operated valve, and with draw drawing between liquid compensation box in liquid recycle device and be connected by drawing liquid offsetting pipe, draw liquid offsetting pipe is connected with and draw liquid compensated pump.
The outer setting drawing liquid zone have connect draw upper and lower, liquid zone draw liquid circulation tube, draw liquid circulation tube is provided with and draw liquid recycle pump.By draw liquid recycle pump will draw liquid drawing upper and lower, liquid zone formed circulation.
Mother liquor district is provided with agitator, ionometer and temperature control equipment with drawing in liquid zone.
Draw liquid recycle device comprise draw liquid commuting case, draw liquid intermediate box, draw liquid multiple-effect evaporator, draw liquid dissolve case, draw liquid compensation box and molten medicine-chest, draw liquid commuting case top and be provided with commuting case electrically operated valve and commuting case electric-powered air release valve, and by commuting case electrically operated valve with draw liquid intermediate box and be connected; The bottom of drawing liquid commuting case is surmounted pipe electrically operated valve by commuting case and is drawn liquid intermediate box and be connected; Draw liquid intermediate box top and be provided with intermediate box electric-powered air release valve, draw liquid intermediate box and draw liquid multiple-effect evaporator and be connected; Draw liquid to dissolve case and draw liquid multiple-effect evaporator and be connected; The bottom of drawing liquid compensation box is connected with the bottom of drawing liquid and dissolve case by compensation box import electrically operated valve; The bottom of molten medicine-chest is connected with the bottom of drawing liquid compensation box by molten medicine outlet electric valve door.
Draw in liquid dissolving case and molten medicine-chest and be provided with agitator and ionometer.
Draw in liquid compensation box and be provided with ionometer.
Clean water device comprises filtered water tank, fresh water pump and clear water pipe, filtered water tank with draw liquid multiple-effect evaporator and be connected, clear water pipe is connected with filtered water tank, and fresh water pump is connected on clear water pipe, and clear water pipe is connected with molten medicine-chest.
Said system, also comprise infiltration energy utilization device, this device comprises airtight rotor casing and turbine generation unit, turbine wheel is provided with in rotor casing, turbine wheel is connected with turbine generation unit, the bottom of rotor casing is provided with rotor casing electric-powered air release valve, rotor casing by rotor casing water inlet electrically operated valve with draw liquid commuting case and be connected, while rotor casing also with draw liquid intermediate box and be connected.
The treatment process of said system, is:
Amount concentration (the ionic state amount of substance in solution and the molecular state amount of substance sum) S of the permeate substance of first analytical calculation Sewage Plant secondary biochemical effluent
1according to required seepage water pressure (△ π, by whether waiting actual demand decision for generating electricity), (in operational process with ionometer display data approximate conversion), show that the airtight commuting case of required first step FO film draws the ionic concn J of liquid
1, J
1be greater than S
1, and draw the progression n of the airtight commuting case of FO film of needs and the number i of every grade of airtight commuting case of FO film; Then by drawing liquid recycle device preparation ionic concn J
1draw liquid, make to draw liquid and be full of the airtight commuting case of first step FO film; Open Sewage Plant secondary biochemical effluent water inlet electrically operated valve, Sewage Plant secondary biochemical effluent flows in the airtight commuting case of first step FO film, with draw liquid and exchange, water molecules in Sewage Plant secondary biochemical effluent is freely reached and draws liquid, what after dilution, volume increased draw liquid realizes drawing being separated of liquid solute (being generally gas) and water (solvent) by drawing multiple-effect evaporator in liquid recycle device, realize the recovery and reuse of drawing liquid solute, unnecessary water enters clean water device, realizes the recycling of water resources; Sewage Plant secondary biochemical effluent is concentrated by the airtight commuting case of FO film step by step, finally cannot reconcentration or enter mother liquor multiple-effect evaporator without the need to mother liquor concentrated further as required and carry out desalting treatment.
The utility model is for the high osmotic pressure characteristic of Sewage Plant secondary biochemical effluent, by preparation colligative property higher draw liquid, the permeable pressure head utilizing colligative property of solution difference to bring, while making Sewage Plant secondary biochemical effluent obtain efficient concentration, recycle and reuse water resources, produces electric energy; Meanwhile, operational process realizes automatic interlock and controls, and can, according to different flow condition adjust operation mode, be convenient to implement.There is following characteristics:
1. make full use of colligative property of solution, by preparation colligative property higher draw liquid (as NH
4hCO
3deng), utilize the Thief zone pressure reduction of itself and Sewage Plant secondary biochemical effluent, while realizing Sewage Plant secondary biochemical effluent efficient concentration, recyclable great lot of water resources;
2. it is large that the FO film adopted has membrane flux, and the characteristic that concentration polarization phenomenon is few, can ensure the smooth realization of infiltration function;
3. the multiple-effect evaporator adopted is general-purpose equipment, adopt pump circulation and negative pressure of vacuum (vacuum tightness 0.08 MPa) evaporation mode, to guarantee the material explosive evaporatoin that (is generally 65 ~ 80 DEG C) at a lower temperature, this equipment has the advantages that material heated time is short, velocity of evaporation is fast, concentration ratio is large, the material of the larger or easy crystallization for viscosity, fouling, adaptability is better, and multiple-effect is evaporated simultaneously, steam obtains Reusability, energy efficient about more than 70% compared with common single-effect evaporator.
4. the osmotic energy that system produces can be converted into electric energy by the infiltration energy utilization device adopted, thus reduces cost for wastewater treatment;
5. make operational process realize automatic interlock by automation instrument to control, be convenient to according to different flow condition adjust operation mode;
6. modular design, can according to Sewage Plant secondary biochemical effluent actual concentrations and other implementation conditions, and independent assortment, has stronger handiness.
Accompanying drawing explanation
Fig. 1 is the structural principle schematic diagram of the utility model energy-efficient Sewage Plant secondary biochemical effluent desalting system.
In figure: 1, water inlet electrically operated valve, 2, the airtight commuting case of FO film, 3, Sewage Plant secondary biochemical effluent agitator, 4, draw liquid agitator, 5, film frame, 6, membrane element, 7, Sewage Plant secondary biochemical effluent ionometer, 8, draw liquid ionometer, 9, temperature control equipment, 10, draw liquid delivery gauge, 11, draw liquid outlet electric valve door, 12, draw liquid recycle pump, 13, draw liquid commuting case, 14, commuting case tensimeter, 15, commuting case electrically operated valve, 16, airtight rotor casing, 17, turbine wheel, 18, turbine generation unit, 19, draw liquid intermediate box, 20, intermediate box electric-powered air release valve, 21, draw liquid multiple-effect evaporator, 22, intermediate box upflow tube, 23, draw liquid and dissolve case, 24, dissolve box mixer, 25, dissolve case ionometer, 26, compensation box import electrically operated valve, 27, draw liquid compensation box, 28, compensation box ionometer, 29, molten medicine outlet electric valve door, 30, molten medicine-chest, 31, molten medicine agitator, 32, draw liquid ionometer, 33, air-washer, 34, filtered water tank, 35, fresh water pump, 36, the first step surmounts pipe electrically operated valve, and 37, discharge opeing electrically operated valve, 38, the second stage surmounts pipe electrically operated valve, and 39, mother liquid evaporation device import electrically operated valve, 40, mother liquor multiple-effect evaporator, 41, draw liquid compensated pump, 42, draw liquid and compensate electrically operated valve, 43, commuting case surmounts pipe electrically operated valve, and 44, water supply pipe, 45, commuting case electric-powered air release valve, 46, rotor casing electric-powered air release valve, 47, rotor casing water inlet electrically operated valve, 48, baffle.
Embodiment
Energy-saving sewage factory of the present utility model secondary biochemical effluent desalting system mainly comprises and is just permeating salt concentrating unit, mother liquor (or claim concentrated solution) multiple-effect evaporator 40 and infiltration energy utilization device, and each device is connected successively by pipeline.The concrete structure of each device as shown in Figure 1.
Just permeating salt concentrating unit, comprising and be at least provided with 3 grades in one-level FO film airtight commuting case 2(Fig. 1), draw liquid recycle device and clean water recovery device.
The bosom of the airtight commuting case 2 of single-stage FO film is provided with film frame 5, is provided with membrane element 6 in film frame 5.Airtight for FO film commuting case 2 is divided into mother liquor district, left side (Sewage Plant secondary biochemical effluent district) and right side to draw liquid zone two portions by film frame 5, and twoth district are complete isolated area, only carry out mass transfer by membrane element 6.The top in mother liquor district is provided with the water inlet pipe of Sewage Plant secondary biochemical effluent, this water inlet pipe is provided with into water electrically operated valve 1, be provided with Sewage Plant secondary biochemical effluent agitator 3, Sewage Plant secondary biochemical effluent ionometer 7 and temperature control equipment 9(in mother liquor district to be arranged on bottom mother liquor district), temperature control equipment 9 can be electric drive, also can be interchanger.Draw in liquid zone to be provided with and draw liquid agitator 4, draw liquid ionometer 8 and well heater (be arranged on and draw bottom liquid zone), the outer setting drawing liquid zone have connect its upper and lower draw liquid circulation tube, draw liquid circulation tube is provided with and draw liquid recycle pump 12, liquid being drawn drawing the formation circulation of upper and lower, liquid zone by drawing liquid recycle pump 12, accelerating mass transfer.
In the airtight commuting case of upper level FO film 2, the bottom in mother liquor district is connected with the top in mother liquor district in the airtight commuting case of next stage FO film by liquid discharge pipe, liquid discharge pipe is provided with discharge opeing electrically operated valve 37, in every airtight commuting case of one-level FO film, the bottom of concentrated liquid zone is all connected with mother liquor multiple-effect evaporator 40 by surmounting pipe simultaneously, surmount and pipe arranges electrically operated valve (surmount pipe electrically operated valve 36 as the first step in Fig. 1 and the second stage surmounts pipe electrically operated valve 38), surmount pipe and be connected with mother liquor multiple-effect evaporator 40 by mother liquid evaporation device import electrically operated valve 39.The top of drawing liquid zone in the airtight commuting case of every one-level FO film is connected with the airtight liquid commuting case 13 that draws respectively by drawing liquid transfer lime, respective draw liquid transfer lime is provided with draw liquid delivery gauge 10 and draw liquid outlet electric valve door 11.The bottom of drawing liquid zone in the airtight commuting case of every one-level FO film is provided with draws liquid compensation electrically operated valve 42, and be connected by drawing liquid offsetting pipe with drawing between liquid compensation box 27, draw liquid offsetting pipe is connected with and draw liquid compensated pump 41, draw on liquid compensation box 27 and be provided with compensation box ionometer 28.
Draw liquid recycle device to comprise and draw liquid commuting case 13, draw liquid intermediate box 19, draw liquid multiple-effect evaporator 21, draw liquid and dissolve case 23, draw liquid compensation box 27 and molten medicine-chest 30, draw liquid commuting case 13, draw liquid intermediate box 19, draw liquid multiple-effect evaporator 21, draw liquid and dissolve case 23 and to draw liquid compensation box 27 be all airtight.It is airtight for drawing liquid commuting case 13, and its top is provided with commuting case tensimeter 14, commuting case electrically operated valve 15 and commuting case electric-powered air release valve 45, and is connected with the top of drawing liquid intermediate box 19 by commuting case electrically operated valve 15; The bottom of drawing liquid commuting case 13 surmounts pipe electrically operated valve 43 by commuting case and is connected with the bottom of drawing liquid intermediate box 19.Draw liquid intermediate box 19 inside and be provided with baffle 48, its top is provided with intermediate box electric-powered air release valve 20.Draw liquid intermediate box 19 and draw liquid multiple-effect evaporator 21 bottom and be connected, and top is connected with intermediate box upflow tube 22.Draw liquid to dissolve case 23 and draw liquid multiple-effect evaporator 21 and be connected, draw liquid and dissolve in case 23 to be provided with and dissolve box mixer 24 and dissolve case ionometer 25, draw bottom liquid dissolving case 23 and be connected with air-washer 33(scrubber tower).The bottom of drawing liquid compensation box 27 is connected with the bottom of drawing liquid and dissolve case 23 by compensation box import electrically operated valve 26, draws in liquid compensation box 27 and is provided with compensation box ionometer 28.The bottom of molten medicine-chest 30 is connected with the bottom of drawing liquid compensation box 27 by molten medicine outlet electric valve door 29, and molten medicine-chest 30 is connected with water supply pipe 44, and is provided with molten medicine agitator 31 in it and draws liquid ionometer 32.Multiple-effect evaporator is general-purpose equipment.
Clean water device comprises filtered water tank 34, fresh water pump 35 and clear water pipe, filtered water tank 34 with draw liquid multiple-effect evaporator 21 and be connected, clear water pipe is connected with filtered water tank 34, and fresh water pump 35 is connected on clear water pipe.Clear water pipe is connected with molten medicine-chest 30 by valve, to utilize the clear water drawing liquid multiple-effect evaporator 21 generation.
Infiltration energy utilization device, comprise airtight rotor casing 16 and turbine generation unit 18, be provided with turbine wheel 17 in rotor casing 16, turbine wheel 17 is connected with turbine generation unit 18, and the bottom of rotor casing 16 is provided with rotor casing electric-powered air release valve 46.Rotor casing 16 by rotor casing water inlet electrically operated valve 47 with draw liquid commuting case 13 and be connected, while also with draw liquid intermediate box 19 and be connected.
The operational process of said system, as described below.
Before operation, first determine following several important parameters:
1, the osmotic pressure π (Sewage Plant secondary biochemical effluent) of the front Sewage Plant secondary biochemical effluent of process
First carry out detection to Sewage Plant secondary biochemical effluent before process to analyze, calculate amount concentration (the ionic state amount of substance molecular state amount of substance sum in the solution) (S of permeate substance wherein
1, with molL
-1meter), adopt Fan Tuofu (van ' t Hoff) formulae discovery to draw the osmotic pressure π (Sewage Plant secondary biochemical effluent) of Sewage Plant secondary biochemical effluent before process:
π (Sewage Plant secondary biochemical effluent)=c
brT ≈ S
1rT
Wherein: π (Sewage Plant secondary biochemical effluent) is the osmotic pressure of Sewage Plant secondary biochemical effluent before process;
Concerning electrolyte solution, c
bsolute molecule and the total amount of substance of ion that osmotic effect in 1L solution, can be produced, c herein
b≈ S
1, be called the amount concentration of permeate substance;
R is gas law constant;
T is absolute temperature.
In operational process, the amount concentration of the permeate substance in FO films at different levels airtight commuting case mother liquor district is by the waste water ionometer display data proximate calculation that it is arranged;
2, the airtight commuting case of first step FO film draws the ionic concn J of liquid
1
According to required permeable pressure head (△ π by whether determines for the actual demand such as to generate electricity), adopt Fan Tuofu (van ' t Hoff) formula π=c
brT calculates the ionic concn J that the airtight commuting case of required first step FO film draws liquid
1:
J
1≈ c
b=π (drawing liquid)/RT
π (drawing liquid)=π (Sewage Plant secondary biochemical effluent)+△ π
π (Sewage Plant secondary biochemical effluent) ≈ S
1rT
Wherein, π (drawing liquid) for drawing the osmotic pressure of liquid, the osmotic pressure that π (Sewage Plant secondary biochemical effluent) is Sewage Plant secondary biochemical effluent;
Concerning electrolyte solution, c
bsolute molecule and the total amount of substance of ion that osmotic effect in 1L solution, can be produced, c herein
b≈ J
1, be called the amount concentration of permeate substance;
R is ideal gas constant;
T is absolute temperature.
In operational process, the airtight commuting case of FO films at different levels draws the amount concentration of the permeate substance of liquid zone by the waste water ionometer display data proximate calculation that it is arranged;
For raising the efficiency, generally adopting and drawing liquid close to saturation concentration.
3, the progression n(serial number of the airtight commuting case of FO film)
To draw the ionic concn J of liquid
1for the saturation concentration drawing liquid solute under normal temperature and pressure conditions is example, its osmotic pressure is definite value π (drawing liquid)
saturated;
Due to the effect of agitator and recycle pump, with the airtight commuting case of one-level FO film mother liquor (or claiming concentrated solution) concentration and draw liquid concentration and can think homogeneous;
When system is normally run, along with constantly concentrating of mother liquor (or claiming concentrated solution), the amount concentration of the mother liquor district permeate substance of the airtight commuting case of FO film not at the same level can be more and more higher, and S
n+1> S
n(S
nbe the amount concentration of permeate substance in the mother liquor of n-th grade of airtight commuting case of FO film, n is the progression of the airtight commuting case of FO film), it also can reduce gradually with the permeable pressure head △ π drawing liquid, in theory, works as S
nclose to the saturation concentration of mother liquor solute, close to when drawing liquid ionic concn J1 and equal to draw liquid ionic concn J1, the mother liquor of FO film both sides and draw liquid and there is not permeable pressure head △ π, now the progression of the airtight commuting case of FO film is the greatest measure of n.
The reduction of permeable pressure head △ π can affect membrane flux and osmotic efficiency, the work of generator also can be affected during for generating electricity, for this reason, the practical factor such as pressure needed for membrane flux, osmotic efficiency and generator impeller, comprehensively determines the progression n of the airtight commuting case of FO film usually.
4, the number i(of every grade of airtight commuting case of FO film quantity in parallel)
The number i of every grade of airtight commuting case of FO film is estimated by following formula:
i=Q/（Q’·S）。
Wherein: Q is wastewater treatment scale (m
3s
-1);
Q ' is FO membrane flux (m
3s
-1m
-2);
S is effective forward osmosis membrane area (m of the airtight commuting case of single FO film
2).
Determine above-mentioned important parameter, mean the configuration of the system of determining.
Open water supply pipe 44, make to add tap water in molten medicine-chest 30, and in molten medicine-chest 30, pouring liquid drawing liquor into, (the amount concentration of permeate substance is J
0, J
0> J
1, market purchasing) or solid draw liquid solute powder (market purchasing), stirred by molten medicine agitator 31, preparation ionic concn is J
1draw liquid, by draw liquid ionometer 32 detect preparation draw liquid ionic concn.Open molten medicine outlet electric valve door 29, make to draw liquid inflow and draw liquid compensation box 27, then the liquid that draws opening the first step successively compensates electrically operated valve 42 and draws liquid compensated pump 41, make to draw liquid and be full of the airtight commuting case 2 of first step FO film, then successively close draw liquid compensated pump 41, the first step draw liquid compensate electrically operated valve 42, molten medicine outlet electric valve door 29 and molten medicine agitator 31, check simultaneously and determine that all the other electrically operated valves are all in closing condition, each vent valve is in opened condition, finally carries out the process preparation work before system cloud gray model.
After above-mentioned job done, open Sewage Plant secondary biochemical effluent water inlet electrically operated valve 1, Sewage Plant secondary biochemical effluent flows into the mother liquor district of the airtight commuting case 2 of first step FO film, because the ionic concn (J of liquid zone is drawn in membrane element 6 side
1) be greater than the amount concentration (S of the permeate substance in mother liquor district
1) permeable pressure head (△ π) that formed, water molecules in mother liquor district Sewage Plant secondary biochemical effluent is freely reached through membrane element 6 and draws liquid zone, be closed structure owing to drawing liquid zone, what after dilution, volume increased draw liquid can enter and airtight draws liquid commuting case 13 by drawing liquid offsetting pipe.Draw after liquid commuting case 13 is full of, close commuting case electric-powered air release valve 45.Draw liquid as utilized to generate electricity, then close commuting case and surmount pipe electrically operated valve 43, open rotor casing water inlet electrically operated valve 47, rare after dilution draws liquid, and (ionic concn is J
1', J
1' < J
1) enter airtight rotor casing 16, promote turbine wheel 17 and do work, export electric energy by turbine generation unit 18, rare after generating draws liquid and enters and draw liquid intermediate box 19.As without the need to generating, then close rotor casing water inlet electrically operated valve 47, open commuting case and surmount pipe electrically operated valve 43, make rare liquid that draws enter and draw liquid intermediate box 19, then enter and draw liquid multiple-effect evaporator 21.By multiple-effect evaporator 21, being separated of liquid solute (being generally gas) and water (solvent) is drawn in realization, and solute wherein enters and draws liquid and dissolve case 23, opens and dissolves box mixer 24, utilize dissolving case ionometer 25 to control strength of solution, realize the recovery and reuse of drawing liquid solute; Unnecessary water enters filtered water tank 34, is delivered to molten medicine-chest 30 or is back to plant area that other is arranged with water by fresh water pump 35, realizes the recycling of water resources.
Sewage Plant secondary biochemical effluent after concentrated enters the airtight commuting case of FO film of next stage step by step by discharge opeing electrically operated valve 37, by above-mentioned process flow operation.Every grade of airtight commuting case of FO film utilizes the temperature control equipment 9 bottom it, the temperature of conservative control Sewage Plant secondary biochemical effluent, the saturation concentration under making its concentration reach this temperature.Finally cannot reconcentration or enter mother liquor multiple-effect evaporator 40 without the need to mother liquor concentrated further as required and carry out desalting treatment.
Claims (9)
1. an energy-saving sewage factory secondary biochemical effluent desalting system, comprise and just permeate salt concentrating unit and mother liquor multiple-effect evaporator, it is characterized in that: just permeating salt concentrating unit and comprising the airtight commuting case of FO film, draw liquid recycle device and clean water recovery device, the airtight commuting case of FO film at least arranges one-level, draw liquid recycle device to be connected respectively by electrically operated valve with the airtight commuting case of FO films at different levels, clean water recovery device with draw liquid recycle device and be connected, the airtight commuting case of FO films at different levels is connected by discharge opeing electrically operated valve successively, and be all connected with mother liquor multiple-effect evaporator by surmounting electrically operated valve.
2. energy-saving sewage factory according to claim 1 secondary biochemical effluent desalting system, it is characterized in that: the inside of the airtight commuting case of described FO film arranges membrane element, airtight for FO film commuting case inside is divided into mother liquor district and draws liquid zone by membrane element, the top in mother liquor district is provided with water inlet pipe, this water inlet pipe is provided with into water electrically operated valve; In the airtight commuting case of upper level FO film, the bottom in mother liquor district is connected with the top in mother liquor district in the airtight commuting case of next stage FO film by discharge opeing electrically operated valve, and in every airtight commuting case of one-level FO film, the bottom in mother liquor district is all connected with mother liquor multiple-effect evaporator by surmounting electrically operated valve simultaneously; The top of drawing liquid zone in the airtight commuting case of every one-level FO film is connected with the liquid commuting case that draws drawn in liquid recycle device respectively by drawing liquid transfer lime, respective draw liquid transfer lime is provided with draw liquid outlet electric valve door; The bottom of drawing liquid zone in the airtight commuting case of every one-level FO film is provided with draws liquid compensation electrically operated valve, and with draw drawing between liquid compensation box in liquid recycle device and be connected by drawing liquid offsetting pipe, draw liquid offsetting pipe is connected with and draw liquid compensated pump.
3. energy-saving sewage factory according to claim 2 secondary biochemical effluent desalting system, is characterized in that: described in draw liquid zone outer setting have connect draw upper and lower, liquid zone draw liquid circulation tube, draw liquid circulation tube is provided with and draw liquid recycle pump.
4. energy-saving sewage factory according to claim 2 secondary biochemical effluent desalting system, is characterized in that: described mother liquor district is provided with agitator, ionometer and temperature control equipment with drawing in liquid zone.
5. energy-saving sewage factory according to claim 1 secondary biochemical effluent desalting system, it is characterized in that: described in draw liquid recycle device comprise draw liquid commuting case, draw liquid intermediate box, draw liquid multiple-effect evaporator, draw liquid dissolve case, draw liquid compensation box and molten medicine-chest, draw liquid commuting case top and be provided with commuting case electrically operated valve and commuting case electric-powered air release valve, and by commuting case electrically operated valve with draw liquid intermediate box and be connected; The bottom of drawing liquid commuting case is surmounted pipe electrically operated valve by commuting case and is drawn liquid intermediate box and be connected; Draw liquid intermediate box top and be provided with intermediate box electric-powered air release valve, draw liquid intermediate box and draw liquid multiple-effect evaporator and be connected; Draw liquid to dissolve case and draw liquid multiple-effect evaporator and be connected; The bottom of drawing liquid compensation box is connected with the bottom of drawing liquid and dissolve case by compensation box import electrically operated valve; The bottom of molten medicine-chest is connected with the bottom of drawing liquid compensation box by molten medicine outlet electric valve door.
6. energy-saving sewage factory according to claim 5 secondary biochemical effluent desalting system, is characterized in that: described in draw liquid and dissolve in case and molten medicine-chest and be provided with agitator and ionometer.
7. energy-saving sewage factory according to claim 5 secondary biochemical effluent desalting system, is characterized in that: described in draw in liquid compensation box and be provided with ionometer.
8. energy-saving sewage factory according to claim 1 secondary biochemical effluent desalting system, it is characterized in that: described clean water device comprises filtered water tank, fresh water pump and clear water pipe, filtered water tank with draw liquid multiple-effect evaporator and be connected, clear water pipe is connected with filtered water tank, fresh water pump is connected on clear water pipe, and clear water pipe is connected with molten medicine-chest.
9. energy-saving sewage factory according to claim 1 secondary biochemical effluent desalting system, it is characterized in that: also comprise infiltration energy utilization device, this device comprises airtight rotor casing and turbine generation unit, turbine wheel is provided with in rotor casing, turbine wheel is connected with turbine generation unit, the bottom of rotor casing is provided with rotor casing electric-powered air release valve, rotor casing by rotor casing water inlet electrically operated valve with draw liquid commuting case and be connected, while rotor casing also with draw liquid intermediate box and be connected.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326615A (en) * | 2014-11-28 | 2015-02-04 | 马涛 | Energy-saving high-salt wastewater treatment system and treatment method |
| CN104386871A (en) * | 2014-11-28 | 2015-03-04 | 马涛 | Secondary bio-chemical effluent desalting system for energy-saving wastewater treatment plant and treating method of secondary bio-chemical effluent desalting system |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104326615A (en) * | 2014-11-28 | 2015-02-04 | 马涛 | Energy-saving high-salt wastewater treatment system and treatment method |
| CN104386871A (en) * | 2014-11-28 | 2015-03-04 | 马涛 | Secondary bio-chemical effluent desalting system for energy-saving wastewater treatment plant and treating method of secondary bio-chemical effluent desalting system |
| CN104386871B (en) * | 2014-11-28 | 2016-07-27 | 马涛 | A kind of energy-saving sewage factory secondary biochemical effluent desalting system and processing method thereof |
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