CN101468821B - Pretreatment system and pretreatment method for sewerage - Google Patents
Pretreatment system and pretreatment method for sewerage Download PDFInfo
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- CN101468821B CN101468821B CN2007103041111A CN200710304111A CN101468821B CN 101468821 B CN101468821 B CN 101468821B CN 2007103041111 A CN2007103041111 A CN 2007103041111A CN 200710304111 A CN200710304111 A CN 200710304111A CN 101468821 B CN101468821 B CN 101468821B
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Abstract
The invention provides a pretreatment device of sewage pretreatment system, which has a water inlet and a water outlet. The sewage pretreatment system also comprises a water mixer, a clean water valve and a water quality test device. The invention provides a sewage pretreatment method, which comprises: detecting the pollution index value; judging whether or not the pollution index value of the sewage meets the requirement of the first threshold value; mixing clean water and sewage and adjusting the inflow of the clean water to make the pollution index value of the mixed sewage meet the requirement of the first threshold valve if the pollution index value dose not meet the requirement of the first threshold value according the result of the judgment; and pretreating mixed sewage. The sewage pretreatment system and the method ensure the quality and the stabile flow of the effluent of the pretreatment device.
Description
Technical field
The present invention relates to water treatment system, relate in particular to a kind of pretreatment system for sewage and pretreatment process.
Background technology
In recent years, along with China's industrialization and process of urbanization, shortage of water resources has become the important factor of restriction China's economy and social development.Adopt the reusing sewage technology not only can save a large amount of new water, can also reduce sewage emissions significantly, thereby become the emphasis of water-saving and emission-reducing.
The reusing sewage technology has obtained rapid progress at present, has formed the sewage appropriateness and has handled and two mainstream technologys of advanced treatment of wastewater." two film " method (ultrafiltration or micro-filtration+reverse osmosis) water technology is typical sewerage advanced treatment process technology, its principle with externally discharged waste water through after reverse osmosis membrane (RO) constitutes " two film " system handles, discharging again with boiler of feeding or circulating water system use by ultra-filtration membrane (UF) (or microfiltration membrane (MF)), have effluent quality good, be easy to realize characteristics such as automatic control, floor space are little, water-saving and environmental protection.Because the water quality of externally discharged waste water does not satisfy UF (or MF) and the RO requirement to influent quality, usually externally discharged waste water at first need be carried out pre-treatment, after by pretreatment system for sewage contaminative impurity such as the chemical oxygen demand (COD) in the sewage (COD), ammonia nitrogen, suspended substance being reduced significantly, further reduce COD in the sewage, suspended substance and microorganism through UF or MF again, make the water quality behind UF or MF deposit density index (SDI) less than 3, to satisfy RO to requirements in water quality.RO can remove the saliferous more than 99% in the water, makes product water water quality reach pseudo-first-order de-salted water index.Therefore, most enterprises adopt " pre-treatment+UF (or MF)+RO " combination process to build sewage water advanced treatment apparatus, and effluent quality is better under normal operation.
But, in the actual use of this combination process, find most of device operation and unstable, exist film to pollute serious problems such as weak point, effluent quality instability in very fast, work-ing life, feasible " two film " system is impacted.Investigate further and analyze the back discovery, the stable device of all pretreatment unit influent qualities, operation is better; And the device that can not normally move, the pretreatment unit influent quality is all unstable, and variation water quality is bigger, and the pretreatment system effluent quality does not reach UF (or MF) and RO to requirements in water quality yet.Especially under the too high situation of organic concentration in externally discharged waste water and ammonia-nitrogen content, system causes serious impact and pollution to " two film ".Therefore, guaranteeing that the pretreatment system influent quality is stable just becomes the key that can " pre-treatment+UF (or MF)+RO " technology normally be moved.
Summary of the invention
The objective of the invention is in existing " pre-treatment+UF (or MF)+RO " technology, the influent quality instability of pretreatment system, do not reach UF (or MF) and RO to the influent quality requirement, system impacts and pollution problems to " two film ", provides a kind of and can guarantee that the pretreatment system influent quality is stable, running cost is low, flexible operation and the waste disposal plant and the method that extensively are suitable for.
Pretreatment system for sewage provided by the invention comprises pretreatment unit, and this pretreatment unit has water-in and water outlet, and described pretreatment system for sewage also comprises water-water jet, water purifying valve and water quality detecting device; Water-water jet has sewage import, water purification import and the sewage outlet with the internal communication of water-water jet, the sewage import is used for introducing pending sewage to the inside of water-water jet, the water purification import is used for introducing water purification to the inside of water-water jet, sewage outlet is connected with the water-in of pretreatment unit, pending sewage and water purification that water-water jet is used for being introduced mix, and mixed sewage is discharged in the pretreatment unit by sewage outlet and water-in; Water quality detecting device is positioned at the sewage outlet place of water-water jet, is used to detect flow through the water quality of sewage of sewage outlet to obtain the pollution index value of sewage; Water purifying valve is positioned at water purification ingress, is used to regulate the water purifying flooding quantity satisfies first threshold with the pollution index value that guarantees mixed sewage requirement.
Sewerage pretreatment method provided by the invention may further comprise the steps: the pollution index value that detects sewage; Judge whether the pollution index value of described sewage satisfies the requirement of first threshold; When described judged result is the pollution index value of described sewage when not satisfying requiring of first threshold, water purification is mixed with described sewage, and regulate the water purifying flooding quantity so that the pollution index value of mixed sewage satisfies the requirement of first threshold; And mixed sewage carried out pre-treatment.
The present invention does not mainly meet water inlet that pretreatment system requires and reaches the water purification that pretreatment system requires and mix by the sewage quality that enters pretreatment system being detected, making according to the water quality detection result, make mixed sewage satisfy pretreatment system by the water purifying dilution to requirements in water quality, with the effluent quality and the water yield of guaranteeing pretreatment system, the stable requirement that reaches UF and RO, thus avoid " two film " system to suffer the impact of bad influent quality.
Description of drawings
Fig. 1 is the structure iron of pretreatment system for sewage provided by the invention;
Fig. 2 is the structure iron of the preferred implementation of pretreatment system for sewage provided by the invention;
Fig. 3 is the structure iron of the preferred implementation of pretreatment system for sewage provided by the invention;
Fig. 4 is the schema of sewage water treatment method provided by the invention;
Fig. 5 is the schema of the preferred implementation of sewage water treatment method provided by the invention.
Embodiment
Below in conjunction with accompanying drawing pretreatment system for sewage provided by the invention and method are described in further detail.
Pretreatment system for sewage provided by the invention comprises pretreatment unit 1, and this pretreatment unit 1 has water-in 10 and water outlet 11, and wherein, described pretreatment system for sewage also comprises water-water jet 3, water purifying valve 13 and water quality detecting device 4; Water-water jet 3 has sewage import 30, water purification import 31 and the sewage outlet 32 with the internal communication of water-water jet 3, sewage import 30 is used for introducing pending sewage to the inside of water-water jet 3, water purification import 31 is used for introducing water purification to the inside of water-water jet 3, sewage outlet 32 is connected with the water-in 10 of pretreatment unit 1, pending sewage and water purification that water-water jet 3 is used for being introduced mix, and mixed sewage is discharged in the pretreatment unit 1 by sewage outlet 32 and water-in 10; Water quality detecting device 4 is positioned at sewage outlet 32 places of water-water jet 3, be used to detect flow through sewage outlet 32 sewage water quality with the pollution index value of sewage; Water purifying valve 13 is positioned at water purification import 31 places, is used to regulate the water purifying flooding quantity satisfies first threshold with the pollution index value that guarantees mixed sewage requirement.
As shown in Figure 1, described pretreatment unit 1 can be for any with the contaminative impurity in its pre-treatment form removal sewage, thereby the waste disposal plant of foreign matter content in the reduction sewage, according to the water quality situation and the on-the-spot condition of on-the-spot externally discharged waste water, described pretreatment unit 1 can be for carrying out pretreated sewage pretreatment unit by aeration filtration (BAF)+coagulating sedimentation+filtration, coagulating sedimentation+filtration+carbon post, bio-contact oxidation+coagulating sedimentation+filtration, activated sludge process+coagulating sedimentation+filtration or other pre-treatment forms to sewage.1 pair of sewage of described pretreatment unit carries out pretreated principle and process is conventionally known to one of skill in the art.
Described water-water jet 3 for example can be vortex water-water jet or vibration water-water jet for the liquid that enters in it being carried out well-mixed container arbitrarily.
Described water quality detecting device 4 is for detecting arbitrarily from the effusive water quality detecting device that will enter water quality that pretreatment unit 1 carries out pretreated sewage with the pollution index value that obtains sewage of sewage outlet 32.Described pollution index value is to need to carry out the content of pretreated contaminative impurity in per unit volume sewage or other parameter values of sewage, for example pH value in the sewage.
The water quality characteristics of the sewage that detects according to on-the-spot needs and the water-quality guideline that enters the control of pretreatment unit 1 needs emphasis, described pollution index value can be in organic content value, solid suspension content value, turbidity value, ammonia nitrogen value, pH value or other pollutent desired values one or more, and described water quality detecting device 4 can be in organic content on line analyzer, suspended solid on line analyzer, turbidity on-line analyser, ammonia nitrogen on line analyzer, pH value on line analyzer or other pollutent on line analyzers one or more.Wherein, described organic content on line analyzer can be preferably UV organism on line analyzer for COD on line analyzer, total organic carbon (TOC) on line analyzer or ultraviolet (UV) organism on line analyzer.The on-the-spot impurity that can detect is as required selected corresponding with it water quality detecting device.Described first threshold is to satisfy the high pollution desired value of sewage of 1 pair of water quality requirement of pretreatment unit, and for different pretreatment units and the on-the-spot demand different to water quality, described first threshold also has nothing in common with each other.Therefore, described first threshold is looked site specific and is set, and needs only the requirement that the sewage that satisfies after pre-treatment can satisfy UF and RO, avoids " two film " to be subjected to impacting just passable.When pollution index value is several in organic content value, solid suspension content value, turbidity value, ammonia nitrogen value, pH value or other pollutent desired values, as long as it is a kind of that wherein a kind of do not satisfy in the corresponding described first threshold that, regulate the water purifying flooding quantity and all satisfy the requirement of first threshold with in the pollution index value that guarantees mixed sewage all.
Therefore, as shown in Figure 2, described water purification import 31 links to each other with described water outlet 11, is used for the water through obtaining after the pre-treatment that pretreatment unit 1 is discharged is incorporated into as water purification the inside of water-water jet 3.
Described water purifying valve 13 for example can be manual or Mechanical Driven variable valve for can progressively regulating the valve of the water purifying flooding quantity of the inside that enters into water-water jet 3 arbitrarily, perhaps is that electricity drives variable valve.The switching that the Mechanical Driven variable valve can come regulated valve by drive unit (for example motor).It for example is magnetic valve that electricity drives variable valve, can directly come the progressively switching of regulated valve by electrical signal.
Under the preferable case, described water purifying valve 13 is for having the magnetic valve of control end, described pretreatment system for sewage also comprises control unit 22, and the input terminus of control unit 22 is connected with the output terminal of water quality detecting device 4, and the output terminal of control unit 22 is connected with the control end of water purifying valve 13; Water quality detecting device 4 is used to also judge whether described pollution index value satisfies the requirement of first threshold, and judged result is sent to control unit 22; Control unit 22 be used for when judged result be the described pollution index value time control water purifying valve 13 that do not satisfy requiring of first threshold to regulate the water purifying flooding quantity, satisfy the requirement of first threshold to keep pollution index value.
As shown in Figure 2, the output terminal of water quality detecting device 4 is connected with the input terminus of control unit 22, be used for sending the normal or improper electrical signal of expression pollution index value to control unit 22, the control end of water purifying valve 13 is connected with the output terminal of control unit 22, is used to receive the electrical signal from control unit 22;
When the pollution index value of the sewage of the water quality detecting device 4 detected sewage outlet 32 of flowing through does not satisfy requiring of first threshold, water quality detecting device 4 sends the improper electrical signal of expression pollution index value to control unit 22, control unit 22 receives this electrical signal, control water purifying valve 13 is progressively opened, make water purification pass through water purifying valve 13 and progressively flow into water-water jet 3, the normal electrical signal of expression pollution index value just stops to regulate water purifying valve 13 or adjusting water purifying valve 13 is progressively closed up to receiving;
When the pollution index value of the sewage of the water quality detecting device 4 detected sewage outlet 32 of flowing through satisfies requiring of first threshold, water quality detecting device 4 sends the normal electrical signal of expression pollution index value to control unit 22, control unit 22 receives this electrical signal, and indication water purifying valve 13 is in current state.
Owing to exist the foreign matter content that need carry out pretreated sewage excessive, cause the pollution index value of the mixed sewage behind water purifying valve 13 complete openings still can not satisfy the situation of the demand of 1 pair of water quality of pretreatment unit, under the preferable case, described pretreatment system for sewage also comprises sewage valve 12, described sewage valve 12 is for having the magnetic valve of control end, be positioned at sewage import 30 places, be used to regulate the flooding quantity of sewage; The output terminal of described control unit 22 also is connected with the control end of sewage valve 12, and described control unit 22 also is used to control sewage valve 12 to regulate the flooding quantity of sewage, satisfies the requirement of first threshold to keep pollution index value.
In the concrete operations, can not satisfy any time adjusting sewage valve 12 that first threshold requires in pollution index value, to keep pollution index value to satisfy the requirement of first threshold, can not work as when pollution index value does not still satisfy requiring of first threshold after adjusting water purifying flooding quantity begins the process predetermined amount of time yet and regulate sewage valve 12, satisfy the requirement of first threshold to keep pollution index value.
For example, when pollution index value did not still satisfy requiring of first threshold after adjusting water purifying flooding quantity begins the process predetermined amount of time, control unit 22 control sewage valves 12 satisfied the requirement of first threshold to regulate the flooding quantity of sewage with the maintenance pollution index value.
Described predetermined amount of time for by the water purifying valve 13 of control unit 22 control from being opened to complete opening institute elapsed time section, this predetermined amount of time is determined by the opening speed of water purifying valve 13.After the process predetermined amount of time, it is water purifying valve 13 complete opening, the water purification that joins in the water-water jet 3 has reached after the maximum, when the pollution index value of sewage does not still satisfy requiring of first threshold, need make the pollution index value of mixed sewage progressively become the requirement of satisfying first threshold by regulating the flooding quantity that sewage valve 12 reduces sewage.
Described sewage valve 12 drives variable valve for the electricity of the flooding quantity of the sewage that can progressively regulate the inside that enters into water-water jet 3 arbitrarily, and for example magnetic valve can directly come the progressively switching of regulated valve by electrical signal.Described sewage valve and water purifying valve from be closed to complete opening fully or from complete opening to the time of closing fully, promptly sewage and water purifying water intake velocity can be set according to the amount of inlet water of the required pretreatment unit of system.
As shown in Figure 3, the control end of sewage valve 12 is connected with the output terminal of control unit 22, is used to receive the electrical signal from control unit 22;
When control unit 22 continues to receive the improper electrical signal of expression pollution index value that is sent by water quality detecting device 4 within the section at the fixed time, control unit 22 control sewage valves 12 are progressively closed, gradually reduce the flooding quantity of the sewage that enters water-water jet 3, the normal electrical signal of expression pollution index value that water quality detecting device 4 sends just stops to regulate sewage valve 12 or control sewage valve 12 is progressively opened up to receiving.
For the water yield of the sewage that guarantees to enter pretreatment unit 1 remains stable, to avoid that " two film " system is afterwards caused unnecessary influence and impact, under the preferable case, described control unit 22 also is used at control water purifying valve 13 to control sewage valve 12 when regulating the water purifying flooding quantity to regulate the flooding quantity of sewage, so that the water purifying flooding quantity of being regulated increases or the flooding quantity of speed that reduces and the sewage of being regulated reduces or the speed of increase equates respectively.Thus, flowing out to the water yield that pretreatment unit 1 carries out pretreated mixed sewage from water-water jet 3 remains stable.
Fig. 4 is the schema of sewerage pretreatment method provided by the invention.As shown in Figure 4, this sewerage pretreatment method may further comprise the steps: the pollution index value that detects sewage; Judge whether the pollution index value of described sewage satisfies the requirement of first threshold; When described judged result is the pollution index value of described sewage when not satisfying requiring of first threshold, water purification is mixed with described sewage, and regulate the water purifying flooding quantity so that the pollution index value of mixed sewage satisfies the requirement of first threshold; And mixed sewage carried out pre-treatment.
As shown in Figure 4, when the pollution index value of detected sewage does not satisfy requiring of first threshold, make water purification flow into water-water jet 3 and progressively increase, mix, satisfy the requirement of first threshold up to the pollution index value of mixed sewage with sewage.
When detected pollution index value satisfies requiring of first threshold, keep current state, the water purifying flooding quantity is not done any adjustment.
Wherein, being used for carrying out the blended water purification with sewage can satisfy the fresh water that first threshold requires for pollution index value, can provide by external water source.Under the preferable case, in order to save the water source, described water purification can provide by carrying out pre-treatment water afterwards.Therefore, be used for carrying out the blended water purification from the water that obtains after the pre-treatment with sewage.
Pollution index value for fear of sewage is excessive, cause and only to control by regulating the water purifying flooding quantity, as shown in Figure 5, describedly water purification and sewage are carried out the blended step also comprise the flooding quantity of regulating sewage, satisfy the requirement of first threshold to keep pollution index value.
In the concrete operations, can not satisfy the flooding quantity of any time adjusting sewage of first threshold requirement in pollution index value, to keep pollution index value to satisfy the requirement of first threshold, also can work as from regulating the flooding quantity that the water purifying flooding quantity begins to regulate when the pollution index value of sewage does not still satisfy requiring of first threshold afterwards through predetermined amount of time sewage, satisfy the requirement of first threshold to keep pollution index value.
For example, when the judged result of described determining step after adjusting water purifying flooding quantity begins the process predetermined amount of time does not still satisfy requiring of first threshold for the pollution index value of described sewage, regulate the flooding quantity of sewage, satisfy the requirement of first threshold up to the pollution index value of mixed sewage.
Therefore, when the pollution index value of sewage does not still satisfy requiring of first threshold after the section at the fixed time, gradually reduce the flooding quantity of sewage, the flooding quantity that when the pollution index value of sewage satisfies requiring of first threshold, just stops to reduce the flooding quantity of sewage or progressively increase sewage.
Wherein remain stablely for the water yield of the mixed sewage that guarantees to flow into pretreatment unit 1, the speed that the water purifying flooding quantity increases or reduces reduces with the flooding quantity of sewage or the speed of increase equates respectively.
Described pollution index value is to need to carry out the content of pretreated contaminative impurity in per unit volume sewage or other parameter values of sewage, for example pH value in the sewage.The water quality characteristics of the sewage that detects according to on-the-spot needs and the water-quality guideline of needs emphasis control, described pollution index value can be in organic content value, solid suspension content value, turbidity value, ammonia nitrogen value and the pH value one or more.
Come the present invention is done more detailed description below by embodiment.
Present embodiment is an example with organic impact in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.
Organic content value with 80 COD (mg/L) in the present embodiment is set at first threshold.
Present embodiment is that the sewage of 70 COD (mg/L) is that the sewage import of the duct type static mixer of QD1-CDSV is introduced from the model of Chinese and Western, Wuhan instrument production with the organic content value, the organic content value that is the water-water jet water inlet is 70 COD (mg/L), and is as shown in table 1.The sewage valve that is positioned at this sewage ingress is that the model of the huge good production in Shanghai is the magnetic valve of ZCZP, the model that this magnetic valve is produced by the Taiwan Chinese workers is that the micro-chip transmission control electrical signal of ADAM-4012 is controlled to realize progressively unlatching and progressively to close, the magnetic valve of this sewage ingress was total up to 10 seconds from being closed to complete opening fully, can reach the discharge of sewage of 0.1 cube of meter per second in 10 seconds behind the complete opening.When sewage was introduced water-water jet, this sewage valve was in the complete opening state.The model that the water purifying valve that is positioned at the water purification ingress of water-water jet is similarly the huge good production in Shanghai is the magnetic valve of ZCZP, be connected with the water purification water source, control to realize unlatching gradually and to close gradually by above-mentioned micro-chip, the magnetic valve of this water purification ingress was total up to 10 seconds from being closed to complete opening fully, can reach the net water flux of 0.1 cube of meter per second in 10 seconds behind the complete opening.When sewage was introduced water-water jet, this water purifying valve was in buttoned-up status.The water quality detecting device that is positioned at the sewage outlet place of water-water jet is the UV organism on line analyzer of UVASsc for the model that An Heng company produces, wherein be provided with first threshold, this UV organism on line analyzer can detect the organic content value in the sewage and itself and first threshold judged, can show simultaneously to detect the organic content value that obtains.The pretreatment unit that is connected with water-water jet is the charcoal filter that model that Shaanxi west star company produces has coagulating sedimentation+filtration+three kinds of functions of carbon post when being TJ-D300.After sewage was introduced into water-water jet, analysis and the judgement to its organic content value flowed in the pretreatment unit again through UV organism on line analyzer.After sewage introduced water-water jet, the organic content value of the sewage that UV organism on line analyzer shows was 70COD (mg/L), and less than first threshold, micro-chip is not done any control to sewage valve and water purifying valve.When sewage valve and water purifying valve did not all move, the organic content value of the pretreatment unit water inlet that UV organism on line analyzer shows is 70 COD (mg/L), and was as shown in table 1.
Embodiment 2
Present embodiment is an example with organic impact in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.
Present embodiment adopts the device identical with embodiment 1 that sewage is carried out pre-treatment.Different is that the organic content value of water-water jet water inlet is 150 COD (mg/L), and is as shown in table 1.After sewage introduced water-water jet, the organic content value of the sewage that UV organism on line analyzer shows is 150 COD (mg/L), greater than first threshold, the micro-chip control water purifying valve is progressively opened, the organic content value of the sewage that UV organism on line analyzer shows after 7 seconds is 80 COD (mg/L), equal first threshold, the micro-chip control water purifying valve remains on current opened condition.When sewage valve and water purifying valve did not all move, the organic content value of the pretreatment unit water inlet that UV organism on line analyzer shows is 80 COD (mg/L), and was as shown in table 1.
Present embodiment is an example with organic impact in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.
Present embodiment adopts the device identical with embodiment 1 that sewage is carried out pre-treatment.Different is that the organic content value of water-water jet water inlet is 200 COD (mg/L), and is as shown in table 1.After sewage introduced water-water jet, the organic content value of the sewage that UV organism on line analyzer shows is 200 COD (mg/L), greater than first threshold, the micro-chip control water purifying valve is progressively opened, water purifying valve complete opening after 10 seconds, the organic content value of the sewage that UV organism on line analyzer shows is 100 COD (mg/L), still greater than first threshold, the micro-chip control sewage valve is progressively closed, the organic content value of the sewage that UV organism on line analyzer shows after 3 seconds is 80 COD (mg/L), equal first threshold, the micro-chip control sewage valve remains on current state.When sewage valve and water purifying valve did not all move, the organic content value of the pretreatment unit water inlet that UV organism on line analyzer shows is 80 COD (mg/L), and was as shown in table 1.
Embodiment 4
Embodiment 4 is used for detecting embodiment 1-3 from the effusive organic content value through the water after the pre-treatment of pretreatment unit.
The CTL-12 type organism analyser that adopts the logical enviromental protection instrument factory of Chengde China to produce detects the organic content value of pretreatment unit water outlet among the embodiment 1-3 respectively, and the result is as shown in table 1.
Table 1
| Project | COD(mg/L) | ||
| |
Embodiment 2 | |
|
| The water-water jet water inlet | 70 | 100 | 200 |
| The pretreatment unit water inlet | 70 | 80 | 80 |
| The pretreatment unit water outlet | 50 | 55 | 55 |
The result of table 1 shows, behind the pretreatment system for sewage that the employing present embodiment provides, the COD of pretreatment unit water inlet significantly reduces, thereby the COD of pretreatment unit water outlet is lower, shows that present embodiment can effectively prevent organism in the sewage to the impact of " two film " system.
Embodiment 5
Present embodiment is an example with the impact of ammonia nitrogen in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.
Present embodiment adopts the device identical with embodiment 1 that sewage is carried out pre-treatment.Different is, the ammonia-nitrogen content value with 10 (mg/L) in the present embodiment is set at first threshold, and the ammonia-nitrogen content value of water-water jet water inlet is 10 (mg/L), and is as shown in table 2.Water quality detecting device is the ammonia nitrogen on line analyzer of Compacx for the model that An Heng company produces, and when sewage valve and water purifying valve did not all move, the ammonia-nitrogen content value of the pretreatment unit water inlet that the ammonia nitrogen on line analyzer shows is 10 (mg/L), and was as shown in table 2.
Embodiment 6
Present embodiment is an example with the impact of ammonia nitrogen in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.Present embodiment adopts the device identical with embodiment 1 that sewage is carried out pre-treatment.Different is, ammonia-nitrogen content value with 10 (mg/L) in the present embodiment is set at first threshold, the ammonia-nitrogen content value of introducing the sewage of water-water jet is 30 (mg/L), water quality detecting device is the ammonia nitrogen on line analyzer of Compacx for the model that An Heng company produces, the micro-chip control water purifying valve is progressively opened, the ammonia nitrogen on line analyzer shows that the ammonia-nitrogen content value is 10 (mg/L) after 8 seconds, equals first threshold, and the micro-chip control water purifying valve remains on current opened condition.When sewage valve and water purifying valve did not all move, the ammonia-nitrogen content value of the pretreatment unit water inlet that the ammonia nitrogen on line analyzer shows is 10 (mg/L), and was as shown in table 2.
Embodiment 7
Present embodiment is an example with the impact of ammonia nitrogen in the pre-bilge water resisting, in order to pretreatment system for sewage provided by the invention and method to be described.Present embodiment adopts the device identical with embodiment 1 that sewage is carried out pre-treatment.Different is, ammonia-nitrogen content value with 10 (mg/L) in the present embodiment is set at first threshold, the ammonia-nitrogen content value of introducing the sewage of water-water jet is 60 (mg/L), water quality detecting device is the ammonia nitrogen on line analyzer of Compacx for the model that An Heng company produces, the micro-chip control water purifying valve is progressively opened, and water purifying valve complete opening after 10 seconds, ammonia nitrogen on line analyzer show that the ammonia-nitrogen content value is 30 (mg/L), still greater than first threshold, the micro-chip control sewage valve is progressively closed.After 8 seconds, the ammonia nitrogen on line analyzer shows that the ammonia-nitrogen content value is 10 (mg/L), equals first threshold, and the micro-chip control sewage valve remains on current state.When sewage valve and water purifying valve did not all move, the ammonia-nitrogen content value of the pretreatment unit water inlet that the ammonia nitrogen on line analyzer shows is 10 (mg/L), and was as shown in table 2.
Embodiment 8
Embodiment 8 is used for detecting embodiment 5-7 from the effusive ammonia-nitrogen content value through the water after the pre-treatment of pretreatment unit.
The Compacx nh 3-n analyser that adopts An Heng company to produce detects the ammonia-nitrogen content value of pretreatment unit water outlet among the embodiment 5-7 respectively, and the result is as shown in table 2.
Table 1
| Project | (mg/L) | ||
| Embodiment 5 | Embodiment 6 | Embodiment 7 | |
| The water-water |
10 | 30 | 60 |
| The pretreatment |
10 | 10 | 10 |
| The pretreatment unit water outlet | 8 | 8 | 7 |
The result of table 2 shows, behind the pretreatment system for sewage that the employing present embodiment provides, the ammonia-nitrogen content of pretreatment unit water inlet significantly reduces, thereby the ammonia-nitrogen content of pretreatment unit water outlet is lower, shows that present embodiment can effectively prevent ammonia nitrogen in the sewage to the impact of " two film " system.
Claims (9)
1. pretreatment system for sewage, this system comprises pretreatment unit (1), this pretreatment unit (1) has water-in (10) and water outlet (11), and wherein, described pretreatment system for sewage also comprises water-water jet (3), water purifying valve (13) and water quality detecting device (4);
Water-water jet (3) has sewage import (30), water purification import (31) and the sewage outlet (32) with the internal communication of water-water jet (3), sewage import (30) is used for introducing pending sewage to the inside of water-water jet (3), water purification import (31) is used for introducing water purification to the inside of water-water jet (3), sewage outlet (32) is connected with the water-in (10) of pretreatment unit (1), described water purification import (31) links to each other with described water outlet (11), is used for the water through obtaining after the pre-treatment that pretreatment unit (1) is discharged is incorporated into as water purification the inside of water-water jet (3);
Water quality detecting device (4) is positioned at the sewage outlet (32) of water-water jet (3) to be located, and is used for detecting flowing through the water quality of sewage of sewage outlet (32) to obtain the pollution index value of sewage;
Water purifying valve (13) is positioned at described water purification import (31) to be located, and is used to regulate the water purifying flooding quantity satisfies first threshold with the pollution index value that guarantees mixed sewage requirement.
2. pretreatment system for sewage according to claim 1, wherein, described water purifying valve (13) is for having the magnetic valve of control end, described pretreatment system for sewage also comprises control unit (22), the input terminus of control unit (22) is connected with the output terminal of water quality detecting device (4), and the output terminal of control unit (22) is connected with the control end of water purifying valve (13);
Water quality detecting device (4) is used to also judge whether described pollution index value satisfies the requirement of first threshold, and judged result is sent to control unit (22);
Control unit (22) be used for when judged result be the described pollution index value time control water purifying valve (13) that do not satisfy requiring of first threshold to regulate the water purifying flooding quantity, satisfy the requirement of first threshold to keep pollution index value.
3. pretreatment system for sewage according to claim 2, wherein, described pretreatment system for sewage also comprises sewage valve (12), described sewage valve (12) is positioned at sewage import (30) to locate for having the magnetic valve of control end, is used to regulate the flooding quantity of sewage; The output terminal of described control unit (22) also is connected with the control end of sewage valve (12);
Described control unit (22) also is used to control sewage valve (12) to regulate the flooding quantity of sewage, satisfies the requirement of first threshold to keep pollution index value.
4. pretreatment system for sewage according to claim 3, wherein, described control unit (22) is used at control water purifying valve (13) with the flooding quantity of control sewage valve (12) when regulating the water purifying flooding quantity with adjusting sewage, so that the speed that the water purifying flooding quantity of being regulated increases or the flooding quantity of speed that reduces and the sewage of being regulated reduces or increases equates respectively.
5. pretreatment system for sewage according to claim 1, wherein, described first threshold is one or more in organic content value, solid suspension content value, turbidity value, ammonia nitrogen value and the pH value, and described water quality detecting device (4) is one or more in organic content on line analyzer, suspended solid on line analyzer, turbidity on-line analyser, ammonia nitrogen on line analyzer and the pH value on line analyzer.
6. sewerage pretreatment method, wherein, this method may further comprise the steps:
A) pollution index value of detection sewage;
B) judge whether the pollution index value of described sewage satisfies the requirement of first threshold;
C) as step B) in judged result be that the pollution index value of described sewage is not when satisfying requiring of first threshold, water purification is mixed with described sewage, and regulate the water purifying flooding quantity so that the pollution index value of mixed sewage satisfies the requirement of first threshold; And
D) mixed sewage is carried out pre-treatment;
Wherein, be used for the blended water purification from step D step C)) water that obtains after the pre-treatment.
7. method according to claim 6, wherein, described step C) also comprise and satisfy the requirement of first threshold to keep pollution index value by the flooding quantity of regulating sewage.
8. method according to claim 7, wherein, the speed that the water purifying flooding quantity increases or reduces equates respectively with the speed that the flooding quantity of sewage reduces or increases.
9. method according to claim 6, wherein, described first threshold is one or more in organic content value, solid suspension content value, turbidity value, ammonia nitrogen value and the pH value.
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| CN108996570A (en) * | 2018-08-20 | 2018-12-14 | 朱翠帮 | A kind of method of treated sewage treatment discharge |
| CN109467205B (en) * | 2018-12-19 | 2021-10-08 | 武汉格林环保设施运营有限责任公司 | High-concentration organic wastewater treatment system |
| CN111781053B (en) * | 2020-06-16 | 2022-12-30 | 力合科技（湖南）股份有限公司 | Water sample pretreatment device, water sample pretreatment system and water sample pretreatment method |
| CN111871989B (en) * | 2020-06-16 | 2022-03-22 | 力合科技（湖南）股份有限公司 | Water sample pretreatment system |
| CN112573641B (en) * | 2020-11-20 | 2021-11-02 | 中国环境科学研究院 | Sewage treatment capacity determining method and device |
| CN113716814A (en) * | 2021-09-26 | 2021-11-30 | 上海上实龙创智能科技股份有限公司 | Sewage allocation system and method |
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