Humidifier water tank wastewater treatment method

Abstract

The invention belongs to the technical field of humidifiers, and discloses a humidifier water tank wastewater treatment method which is implemented through a water treatment system, the water treatment system comprises a water tank, a humidification filter screen, a water pump, a one-inlet multi-outlet valve and a plurality of filter elements arranged in parallel, and the filter elements are respectively communicated with the one-inlet multi-outlet valve; comprising the following steps that a water pump is started, the operation time is ta, and ta = (Q / (m * V)) + t0; then carrying out adsorption treatment; the ith adsorption treatment comprises the following processes: opening the ith filter element, closing all the other filter elements, and setting the operation time to be tb; tb = t / (n-1); t is the adsorption time corresponding to the maximum removal rate. The treatment method can solve the problem that residual water in a water tank of an existing humidifier is polluted and yellowed, the effect that normal use and operation of the humidifying function of the humidifier are not affected in the treatment process can be achieved, the use experience of a user is improved through the treatment method, the time for keeping the residual water of the humidifier transparent can be prolonged, and the user experience is improved. The service life is further prolonged.

Description

Technical Field

[0001] The invention belongs to the technical field of humidifiers, and particularly relates to a method for treating wastewater from a humidifier water tank. Background Art

[0002] Current mainstream humidifiers lift water from a water tank into a humidifying filter. The impeller then generates airflow, which draws dry air through the filter and out, removing moisture from the moist filter. Airborne pollutants are intercepted and adsorbed by the filter, and absorbed by the water within. Any moisture not carried away by the airflow flows back down to the water tank under the influence of gravity.

[0003] When a humidifier is used day after day and users constantly refill the water tank, the water in the water tank circulates continuously, further enriching the pollutants intercepted and adsorbed in the air. The water in the water tank is further concentrated into wastewater with high color, high turbidity, high salinity, and high organic matter content. If not cleaned and replaced in time, the accompanying humidification filter will become dirty, adversely affecting user health and user experience, and negatively affecting the brand image. Directly dumping this wastewater also poses a risk of environmental pollution. Summary of the Invention

[0004] The purpose of this application is to address the deficiencies of the prior art and provide a method for treating wastewater from a humidifier water tank. The treatment method is implemented by a water treatment system, which includes:

[0005] A humidifier comprising a water tank (for storing and supplying water and serving as a return point for excess water from the humidification filter) and a humidification filter (for evenly distributing water flow and providing a water storage space for the airflow to carry away water vapor), wherein the water tank contains wastewater to be treated;

[0006] A water pump (a power device that provides power for the system water circulation), the input end of the water pump being connected to the output end of the water tank;

[0007] A one-inlet-multiple-outlet valve (to achieve sequential batch water inlet), wherein the input end of the one-inlet-multiple-outlet valve is connected to the output end of the water pump;

[0008] A multi-stage parallel filter element group, comprising a plurality of filter elements arranged in parallel, wherein the input end of each filter element is independently connected to a different output end of the one-inlet, multiple-outlet valve; and the output end of the multi-stage parallel filter element group is connected to the input end of the humidification filter screen;

[0009] The processing method comprises the following steps:

[0010] Turn on the water pump, and the wastewater to be treated passes through the water pump, the one-inlet-multiple-outlet valve, the multi-stage parallel filter element group and the humidification filter screen in sequence. The running time is t a , t a=(Q / (m*V))+t0; wherein m is the number of filter elements, m is greater than 1, V is the adsorption volume of a single filter element, Q is the design flow rate, and t0 is the stabilization time of the water pump;

[0011] Then, several cycle treatments are performed, wherein one cycle treatment includes n adsorption treatments, where n is equal to m;

[0012] The i-th adsorption treatment includes the following process: opening the i-th filter element and closing all other filter elements, and the operation time is t b ; Wherein, i is any integer from 1 to n; t b =t / (n-1); t is the efficient adsorption time, which is obtained by the following process: adding a water sample of the wastewater to be treated to the filter element of equal mass and letting it stand, testing its absorbance at different time points, calculating the real-time concentration based on the fitting curve of absorbance and concentration, and then obtaining the removal rate based on the real-time concentration and the initial concentration. The t is the adsorption time corresponding to the maximum removal rate.

[0013] This application obtains the high-efficiency adsorption time to determine the relevant parameters of the subsequent water treatment system and treatment method, and combines it with the sequential batch water inlet method to ensure that the normal water circulation of the system operation is not affected (water tank-water pump-humidification filter-water tank), while also ensuring that the pollutants in the water in the filter element have the greatest possible adsorption and removal efficiency; the sequential batch water inlet method referred to here is to divide the filter element into multiple stages in parallel, and after filling with water, the filter elements discharge water in turn, that is, some filter elements filter out water to provide a normal water flow channel, and some filter elements store water for static adsorption. After multiple cycles, the water output from each filter element can meet the requirement that the residence time of the water sample in the filter element is greater than the high-efficiency adsorption time (that is, the residence time of high-efficiency adsorption), thereby ensuring that the normal operation of the system is not affected and the purpose of efficient chromaticity removal is met.

[0014] The specific steps of sequential batch water inflow are as follows:

[0015] (1) After the water pump is started, the wastewater to be treated in the water tank passes through m parallel filter elements at the same time, and the time t a , so that the m filter elements are filled with water, and the humidification filter is kept moist, and the system operates normally.

[0016] (2) When running t a After a certain time (the filter element is filled with water and the system is stable), the one-inlet, multi-outlet valve is controlled to open the valve of the mth filter element (hereinafter referred to as filter element m, and the m filter elements are pre-defined as filter element 1, filter element 2, ... filter element m). The valves of the water paths of the other m-1 filter elements are closed, and the water flows out through filter element m. The remaining m-1 filter elements are left to absorb water. At this time, the residence time of the water in the m filter elements is t1, t1 = Q / (n*V). The system starts to run continuously for t b.

[0017] (3) In the first cycle, after t b After the time has passed, the one-inlet-multiple-outlet valve is controlled to open the valve of filter element 1, and the valves of the other filter elements are closed. The water path of filter element 1 is opened, and the water paths of filter element m and the other filter elements are closed. Water flows out through filter element 1, and the other filter elements are left to stand for adsorption. At this time, the water residence time in filter element m is t1, and the water residence time in the other filter elements is t2. The system starts to run continuously for time t b . t2=(Q / (n*V))+(t / (n-1)).

[0018] (4) In the second cycle, after t b Time (accumulated running time after stabilization 2t b ) After the water is drained, the single-inlet, multi-outlet valve is controlled to open filter element 2, closing the valves in the other filter elements' waterways. This opens the waterway in filter element 2, while the waterways in filter element 1 and the remaining filter elements are closed, allowing water to flow out through filter element 2. At this point, the water's residence time in filter element m is t2, the water's residence time in filter element 1 is t1, and the water's residence time in the other filter elements is t3. t3 = (Q / (n*V)) + (2*t / (n-1)).

[0019] (5) In the i-th cycle (i=1, 2, 3...n-2, where n is a positive integer greater than 2), after t b Time (accumulated running time after stabilization i*t b ), the one-inlet-multiple-outlet valve is controlled to open the valve of filter element i (m filter elements are pre-defined as filter element 1, filter element 2, ... filter element m, filter element i refers to any filter element other than filter element 1, filter element 2, and filter element m in the above steps. At the same time, the value of i in filter element i here is also consistent with the value of i in the i-th cycle), close the valves of the water channels of other filter elements, open the water channel of filter element i, and close the water channels of other filter elements, and water flows out through filter element i. At this time:

[0020] ①The residence time of water in filter element m is t i ,

[0021] ②The water residence time in filter element 1 is t (i-1) ,

[0022] ③The water residence time in filter element 2 is t (i-2) ,

[0023] ④ The water residence time in filter element i-1 is t (i-(i-1)) ,

[0024] ⑤The water residence time in filter element i is t (i+1)) ,

[0025] (6) In the n-1th cycle, after t b Time (cumulative running time after stabilization (n-1)*t b ) After that, the one-inlet-multiple-outlet valve is controlled to open the valve of filter element m-1, close the valves of other filter element water channels, the water channel of filter element m-1 is opened, and the water channels of other filter elements are closed, and water flows out through filter element m-1. At this time:

[0026] ①The residence time of water in filter element m is t (n-1) ,

[0027] ②The water residence time in filter element 1 is t (n-2) ,

[0028] ③The water residence time in filter element 2 is t (n-3) ,

[0029] ④ The water residence time in filter element m-2 is t (n-(n-1)) ,

[0030] ⑤The water residence time in filter element m-1 is t n ,

[0031] At this time, the water residence time in filter element m-1 is t n It is longer than the high-efficiency adsorption time t of the filter element. Therefore, starting from cycle n-1, the water outlet of the parallel filter element group in subsequent cycles will stay in the filter element for a longer time than the high-efficiency adsorption time of the filter element, and the water outlet can achieve the effect of high-efficiency decolorization. Note:

[0032]

[0033] (7) When the filter group performs the n-1th cycle, it can be guaranteed that the residence time of the water outlet of each subsequent filter element is greater than the residence time of efficient adsorption. Therefore, with n cycles as one cycle, it can be regarded that the first-level filter element has completed the adsorption of V×F n ×t of pollutants (F n is the removal rate at the nth cycle, t is the efficient adsorption time), then the concentration in the humidifier water tank after multiple cycles is:

[0034]

[0035] Where V h is the maximum design volume of the humidifier water tank; X is the number of cycles; C x is the concentration of colored pollutants in the water tank after a number of cycles, X is the number of cycles; α is the concentration multiple of the water tank volume (0<α≤Vh / V L , V L The low water level of the humidifier tank can be known in the specific humidifier).

[0036] In some cases, the filter element includes at least one of alloy grid, non-woven fabric, quartz sand, zeolite, manganese sand, polyferric chloride, polyaluminum chloride, inclined tube packing, PP melt-blown, ultrafiltration membrane, activated carbon, ion exchange resin and water curtain paper.

[0037] In some preferred embodiments, the filter element is provided with a water inlet grid, a non-woven fabric, a sand filter layer, an inclined tube filler, an activated carbon layer, and a water curtain paper in sequence from the input end to the output end of the filter element; the wastewater to be treated flows upward from the input end to the output end of the filter element; thereby ensuring the stability of the water channel, facilitating filtration and adsorption, and better improving the adsorption effect. In addition, the water inlet grid can perform preliminary filtration, intercepting particles of dust, mud, sediment, mosquitoes, etc.; the non-woven fabric can filter smaller particles in the water to prevent leakage of the sand filter layer; after the water passes through the sand filter layer, it enters the lower end of the inclined tube, and the inclined tube plays a role in evenly distributing the incoming water, ensuring that the water flow rises and flows out in a laminar form. After the particulate pollutants and aggregated colloids collide with the inclined tube surface, they will settle downward, achieving even distribution of water flow and solid-liquid separation; the water curtain paper can evenly distribute the outflow, and at the same time further adsorb the colored groups of the activated carbon outflow.

[0038] The sand filter layer comprises at least one of quartz sand, zeolite, manganese sand, polyferric chloride, and polyaluminum chloride. It can further filter out some soluble impurities and has a certain filtering effect on colloids. It also compresses the double layer of charged colloids, lowering the zeta potential of difficult-to-filter colloids in the water and reducing their mutual electrostatic repulsion, allowing the colloids to aggregate into large particles that can be filtered and intercepted.

[0039] In some preferred embodiments, the activated carbon layer is surrounded by PP melt-blown film, which can not only cooperate with the activated carbon to filter the water after adsorption by the inclined tube filler, but also prevent the activated carbon from leaking out.

[0040] In some preferred embodiments, an ash hopper is further provided below the water inlet grid, which can be used to collect particulate pollutants, sediments, aggregated colloidal particles, etc. that have been filtered and intercepted.

[0041] Among them, the fitting curve of absorbance and concentration is obtained by the following process: the water sample of the above-mentioned wastewater to be treated is diluted according to a gradient to obtain samples with concentrations of 1, 1 / 2, 1 / 5, 1 / 10, 1 / 20, 1 / 50, and 1 / 100 of the concentration of the above-mentioned wastewater to be treated, respectively, the absorbance of all the above samples is tested respectively, and then the absorbance of all the above samples is linearly fitted with the corresponding concentrations to obtain the fitting curve of absorbance and concentration.

[0042] All absorbance values are measured at the characteristic absorption wavelength of the wastewater to be treated; the characteristic absorption wavelength is 280 nm to 320 nm. Removal rate = (real-time concentration - initial concentration) / adsorption time, where t is the adsorption time corresponding to the maximum removal rate.

[0043] The beneficial effects of the present application are: the present application provides a treatment method that can solve the problem of the residual water in the existing humidifier water tank being contaminated and yellowing, and can achieve the effect of not affecting the normal use and humidification function of the humidifier during the treatment process. The treatment method of the present application improves the user experience, can extend the time that the residual water in the humidifier remains transparent, and further extend the service life of the humidification filter. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 Shown is a schematic diagram of yellow water in a humidifier;

[0045] Figure 2 The diagram shows the yellowing of the humidifier filter.

[0046] Figure 3 Shown is a schematic structural diagram of the first composite filter element;

[0047] Figure 4 Shown are UV-visible spectra of the wastewater sample to be treated and pure water;

[0048] Figure 5 Shown is a graph of a gradient dilution water sample;

[0049] Figure 6 Shown is a schematic diagram of the water treatment system in Example 2;

[0050] Figure 7 Shown are pictures of water samples after treatment in Comparative Example 1 and Example 1.

[0051] Among them, 1 is the ash storage hopper, 2 is the water inlet grille, 3 is the non-woven fabric, 4 is the sand filter layer, 5 is the inclined tube filler, 6 is the PP melt-blown, 7 is the activated carbon layer, and 8 is the water curtain paper. DETAILED DESCRIPTION

[0052] The following will be combined with the embodiments and drawings to clearly and completely describe the concept, specific structure and technical effects of the present invention so as to fully understand the purpose, scheme and effect of the present invention. It should be noted that the embodiments and features in the embodiments of the present invention can be combined with each other unless there is any conflict. The same reference numerals used throughout the drawings indicate the same or similar parts.

[0053] In the following, the fitting curve of absorbance and concentration is obtained by the following process:

[0054] The whole spectrum of the water sample solution to be treated was scanned by UV-visible spectrophotometer to obtain its highest absorption peak and its characteristic absorption wavelength λ0; the water sample solution to be treated was diluted in a gradient to obtain the original solution, 1 / 2, 1 / 5, 1 / 10, 1 / 20, 1 / 50, 1 / 100 and other gradients, and the original solution concentration was defined as C1 = 1, then C 1 / 2 =0.5, C 1 / 5 =0.2, C 1 / 10 =0.1, C 1 / 20 =0.05, C 1 / 50 =0.025, C 1 / 100 =0.01, define the concentration of pure water as C0=0; perform absorbance test on the dilution solutions of different concentrations at the absorption wavelength λ0 to obtain the absorbance corresponding to the concentration gradient, A1, A 1 / 2 、A 1 / 5 、A 1 / 10 、A 1 / 20 、A 1 / 50 、A 1 / 100 , and the absorbance of pure water A0; draw a curve with the absorbance data as the ordinate and the corresponding concentration as the abscissa, perform linear fitting and correlation analysis, and the correlation coefficient R 2 >0.95, the curve is available; the obtained concentration (color) - absorbance curve equation is C = K*A + b, where C is the solution concentration (color), A is the absorbance, K is the slope of the fitting curve, and b is the intercept of the fitting curve.

[0055] In the following content, the optimal adsorption time is obtained by the following process:

[0056] Mix the water sample to be treated with the filter element and let it stand for a certain period of time. x By conducting an absorbance test once in a certain period of time, a series of absorbance data can be obtained. Subsequently, the corresponding real-time concentration (color) is calculated based on the fitting curve of absorbance and concentration. Then, according to the calculation formula of removal rate = (real-time concentration - initial concentration) / adsorption time, the efficient adsorption time t is obtained, that is, the adsorption time corresponding to the maximum concentration (color) removal rate.

[0057] Example 1

[0058] The existing humidifier is prone to water contamination after being used for a long time, as shown in the schematic diagram. Figure 1 As shown, this will also cause the humidification filter of the humidifier to turn yellow, as shown in the schematic diagram Figure 2 As shown (the left picture is the humidification filter, and the right picture is the yellow part of the humidification filter after removing the outer shell).

[0059] Therefore, this embodiment provides a method for treating wastewater from a humidifier water tank. The method is implemented by a water treatment system, which includes:

[0060] A humidifier includes a water tank (for storing and supplying water, and as a place for the return of excess water from the humidification filter) and a humidification filter (for evenly distributing water flow and providing a water storage place for the airflow to carry away water vapor). The water tank contains wastewater to be treated;

[0061] A water pump (power device, providing power for the system water circulation), the input end of the water pump is connected to the output end of the water tank;

[0062] One-inlet-two-outlet valve (to realize sequential batch water inlet), the input end of the one-inlet-two-outlet valve is connected to the output end of the water pump;

[0063] A two-stage parallel filter element group includes two filter elements (a first composite filter element and a second composite filter element) arranged in parallel, wherein the input end of each filter element is independently connected to a different output end of the one-inlet, two-outlet valve; the output end of the two-stage parallel filter element group is connected to the input end of the humidification filter;

[0064] The structural diagram of the first composite filter element is as follows Figure 3 As shown, from the input end to the output end of the first composite filter element, the first composite filter element is sequentially provided with an ash storage hopper 1 (which can be used to collect particulate pollutants, sediments, aggregated colloidal particles, etc. that have been filtered and intercepted), a water inlet grid 2, a non-woven fabric 3, a sand filter layer 4 (formed by a mixture of quartz sand, zeolite and manganese sand), an inclined tube filler 5, an activated carbon layer 7 (surrounded by a PP melt-blown 6; it can not only cooperate with the activated carbon to filter the water after adsorption by the inclined tube filler, but also prevent the activated carbon from leaking), and a water curtain paper 8; the wastewater to be treated flows upward from the input end to the output end of the filter element, that is, it is ensured that water enters from the bottom to the top (thereby ensuring the stability of the water flow channel, facilitating filtration and adsorption, and better improving the adsorption effect); the structure of the second composite filter element is the same as that of the first composite filter element;

[0065] The treatment method includes the following steps:

[0066] First, a full spectrum scan is performed on the wastewater sample to be treated, and its UV-visible spectrum is shown in Figure 4 (the yellow water sample is the wastewater sample to be treated). It can be seen that the water sample has the highest absorption peak at 305nm, that is, the characteristic absorption wavelength λ0 = 305nm of the water sample tested this time.

[0067] After gradient dilution of the water sample ( Figure 5 The absorbance was measured to obtain the absorbance-concentration (color) fitting curve, and the equation was C=0.2954*A-0.0165, R 2 =0.9892>0.95.

[0068] The water sample was placed in a beaker and added to filter elements of equal mass and with the same structure as the first composite filter element and allowed to stand. The absorbance was tested at 0 min, 5 min, 10 min, 15 min, 20 min, 30 min, 40 min, 50 min, and 60 min respectively; the concentration (chromaticity) was calculated according to the absorbance-concentration (chromaticity) fitting curve equation, and then the efficient adsorption time t was calculated to be 5 min.

[0069] Turn on the water pump, and the wastewater to be treated passes through the water pump, the one-inlet and two-outlet valve, the two-stage parallel filter element group and the humidification filter screen in sequence. The running time is t a , t a =1min; then every 5min (2-stage parallel connection t b = t = 5min) alternately open the water circuit switches corresponding to the first composite filter element and the second composite filter element (i.e., operate the one-inlet and two-outlet valves), that is, one filter element passes the flow while the other filter element remains stationary for adsorption;

[0070] Then, 6 cycles of treatment were performed (ie, 5 min*2*6=60 min).

[0071] In some other embodiments, when the number of filter elements used is greater than 2, the specific steps of sequential batch water inlet are as follows:

[0072] (1) After the water pump is started, the wastewater to be treated in the water tank passes through m parallel filter elements at the same time, and the time t a , so that the m filter elements are filled with water, and the humidification filter is kept moist, and the system operates normally.

[0073] (2) When running t a After the filter element is filled with water and the system is stable, the one-inlet and multiple-outlet valve is controlled to open the valve of the mth filter element (hereinafter referred to as filter element m), and the valves of the water channels of the other m-1 filter elements are closed. Water flows out through filter element m, and the remaining m-1 filter elements are left to absorb. At this time, the residence time of water in the m filter elements is t1, t1 = Q / (n*V). The system starts to run continuously for t b .

[0074] (3) In the first cycle, after t b After the time has passed, the one-inlet-multiple-outlet valve is controlled to open the valve of the first filter element and close the valves of the other filter elements. The water path of the first filter element is opened, and the water paths of filter element m and the other filter elements are closed. Water flows out through the first filter element, and the other filter elements are left to stand for adsorption. At this time, the water residence time in filter element m is t1, and the water residence time in the other filter elements is t2. The system starts to run continuously for time t b . t2=(Q / (n*V))+(t / (n-1)).

[0075] (4) In the second cycle, after t bTime (accumulated running time after stabilization 2t b ) After the water is drained, the single-inlet, multi-outlet valve is controlled to open the valve of the second filter element and close the valves of the other filter elements. The water path of the second filter element is opened, and the water paths of the first and other filter elements are closed, allowing water to flow out through the second filter element. At this time, the water residence time in filter element m is t2, the water residence time in the first filter element is t1, and the water residence time in the other filter elements is t3. t3 = (Q / (n*V)) + (2*t / (n-1)).

[0076] (5) In the i-th cycle (i=1, 2, 3...n-2, where n is a positive integer greater than 2), after t b Time (accumulated running time after stabilization i*t b ), control the one-inlet-multiple-outlet valve to open the valve of filter element i (m filter elements are pre-defined as the first filter element, the second filter element, ... filter element m, filter element i refers to any filter element other than the first filter element, the second filter element, and the filter element m in the above steps. At the same time, the value of i in filter element i here is also consistent with the value of i in the i-th cycle), close the valves of the water channels of other filter elements, open the water channel of filter element i, and close the water channels of other filter elements, and water flows out through filter element i. At this time:

[0077] ①The residence time of water in filter element m is t i ,

[0078] ②The water residence time in the first filter element is t (i-1) ,

[0079] ③The water residence time in the second filter element is t (i-2) ,

[0080] ④ The water residence time in filter element i-1 is t (i-(i-1)) ,

[0081] ⑤The water residence time in filter element i is t (i+1)) ,

[0082] (6) In the n-1th cycle, after t b Time (cumulative running time after stabilization (n-1)*t b ) After that, the one-inlet-multiple-outlet valve is controlled to open the valve of filter element m-1, close the valves of other filter element water channels, the water channel of filter element m-1 is opened, and the water channels of other filter elements are closed, and water flows out through filter element m-1. At this time:

[0083] ①The residence time of water in filter element m is t (n-1) ,

[0084] ②The water residence time in the first filter element is t (n-2) ,

[0085] ③The water residence time in the second filter element is t (n-3) ,

[0086] ④ The water residence time in filter element m-2 is t (n-(n-1)) ,

[0087] ⑤The water residence time in filter element m-1 is t n ,

[0088] At this time, the water residence time in filter element m-1 is t n It is longer than the high-efficiency adsorption time t of the filter element. Therefore, starting from cycle n-1, the water outlet of the parallel filter element group in subsequent cycles will stay in the filter element for a longer time than the high-efficiency adsorption time of the filter element, and the water outlet can achieve the effect of high-efficiency decolorization. Note:

[0089]

[0090] (7) When the filter group performs the n-1th cycle, it can be guaranteed that the residence time of the water outlet of each subsequent filter element is greater than the residence time of efficient adsorption. Therefore, with n cycles as one cycle, it can be regarded that the first-level filter element has completed the adsorption of V×F n ×t of pollutants (F n is the removal rate at the nth cycle, t is the efficient adsorption time), then the concentration in the humidifier water tank after multiple cycles is:

[0091]

[0092] Where V h is the maximum design volume of the humidifier water tank; X is the number of cycles; C x is the concentration of colored pollutants in the water tank after a number of cycles, X is the number of cycles; α is the concentration multiple of the water tank volume (0<α≤V h / V L , V L The low water level of the humidifier tank can be known in the specific humidifier).

[0093] In some other embodiments, the first composite filter element comprises at least one of an alloy grid, non-woven fabric, quartz sand, zeolite, manganese sand, polyferric chloride, polyaluminum chloride, inclined tube packing, PP melt-blown, ultrafiltration membrane, activated carbon, ion exchange resin, and dam paper. The water inlet grid performs preliminary filtration, intercepting particles of dust, silt, sediment, mosquitoes, etc.; the non-woven fabric filters smaller particles in the water, preventing leakage from the sand filter layer; after passing through the sand filter layer, water enters the lower end of the inclined tube, which distributes the incoming water evenly, ensuring that the water flows upward in a laminar manner. Particles and aggregated colloids colloidal particles collide with the inclined tube surface and settle downward, achieving uniform water flow and solid-liquid separation; the dam paper distributes the outflow evenly and further adsorbs the chromogenic groups in the activated carbon outflow. In some other embodiments, the sand filter layer includes at least one of quartz sand, zeolite, manganese sand, polyferric chloride and polyaluminum chloride (which can further filter out some soluble impurities and also has a certain filtering effect on colloids. At the same time, it compresses the double layer of charged colloids, reduces the zeta potential of colloids that are difficult to filter in water, and reduces their mutual electrostatic repulsion so that the colloids can aggregate into large particles and be filtered and intercepted).

[0094] Example 2

[0095] A method for treating wastewater from a humidifier water tank, which differs from Example 1 in that: a three-stage filter element group (including composite filter element A, composite filter element B, and composite filter element C; the structures are the same as the first composite filter element structure in Example 1) and a one-inlet-three-outlet valve are used, and the corresponding parameters are adaptively adjusted; other parameters are the same as Example 1. The schematic diagram of the water treatment system involved in this embodiment is shown in FIG. Figure 6 shown.

[0096] Comparative Example 1

[0097] A method for treating wastewater from a humidifier water tank is different from Example 1 in that: the water channel switches of the first composite filter element and the second composite filter element are always kept open at the same time; other aspects are consistent with Example 1.

[0098] The water bodies of Example 1 and Comparative Example 1 were tested after being treated for the same time for 60 minutes. It was found that the direct flow of the filter element in Comparative Example 1 had a certain effect on the removal of chromatic pollutants in the water body, with a removal rate of 77.46%, but it was still slightly yellowish to the naked eye; while the removal rate of Example 1 using the sequencing batch water inlet method was able to reach 95.66%, which was significantly better than the direct flow method used in Comparative Example 1, and the yellowish color of the water sample could no longer be seen by the naked eye. The water sample after treatment in Comparative Example 1 is shown in Figure 2. Figure 7 As shown in (a), the water sample after treatment in Example 1 is Figure 7 As shown in (b); the six bottles side by side in Figure (a) and (b) are diluted gradient water samples of the wastewater to be treated, which are used for visual comparison to observe the removal effect.

[0099] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. As long as the technical effects of the present invention are achieved by the same means, they shall fall within the scope of protection of the present invention. Within the scope of protection of the present invention, various modifications and variations of the technical solutions and / or implementation methods may be made.

Claims

1. A method for treating humidifier water tank wastewater, characterized in that: The treatment method is implemented by a water treatment system, which includes: A humidifier, the humidifier comprising a water tank and a humidifying filter, the water tank containing wastewater to be treated; a water pump, wherein an input end of the water pump is connected to an output end of the water tank; a one-inlet-multiple-outlet valve, wherein the input end of the one-inlet-multiple-outlet valve is connected to the output end of the water pump; A multi-stage parallel filter element group, comprising a plurality of filter elements arranged in parallel, wherein the input end of each filter element is independently connected to a different output end of the one-inlet, multiple-outlet valve; and the output end of the multi-stage parallel filter element group is connected to the input end of the humidification filter screen; The processing method comprises the following steps: Turn on the water pump, and the wastewater to be treated passes through the water pump, the one-inlet-multiple-outlet valve, the multi-stage parallel filter element group and the humidification filter screen in sequence. The running time is t a , t a =(Q / (m*V))+t0; wherein m is the number of filter elements, m is greater than 1, V is the adsorption volume of a single filter element, Q is the design flow rate, and t0 is the stabilization time of the water pump; Then, several cycle treatments are performed, wherein one cycle treatment includes n adsorption treatments, where n is equal to m; The i-th adsorption treatment includes the following process: opening the i-th filter element and closing all other filter elements, and the operation time is t b ; Wherein, i is any integer from 1 to n; t b =t / (n-1); t is the efficient adsorption time, which is obtained by the following process: adding a water sample of the wastewater to be treated to the filter element of equal mass and letting it stand, testing its absorbance at different time points, calculating the real-time concentration based on the fitting curve of absorbance and concentration, and then obtaining the removal rate based on the real-time concentration and the initial concentration. The t is the adsorption time corresponding to the maximum removal rate.

2. The processing method according to claim 1, characterized in that The filter element includes at least one of alloy grid, non-woven fabric, quartz sand, zeolite, manganese sand, polyferric chloride, polyaluminum chloride, inclined tube filler, PP melt-blown, ultrafiltration membrane, activated carbon, ion exchange resin and water curtain paper.

3. The processing method according to claim 2, characterized in that From the input end to the output end of the filter element, the filter element is sequentially provided with a water inlet grid, non-woven fabric, sand filter layer, inclined tube filler, activated carbon layer, and water curtain paper; the wastewater to be treated flows upward from the input end to the output end of the filter element.

4. The processing method according to claim 3, characterized in that The sand filter layer includes at least one of quartz sand, zeolite, manganese sand, polyferric chloride and polyaluminum chloride.

5. The processing method according to claim 3, characterized in that: The activated carbon layer is surrounded by PP melt-blown.

6. The processing method according to claim 3, characterized in that: An ash storage hopper is also provided below the water inlet grid.

7. The processing method according to claim 1, characterized in that The fitting curve of absorbance and concentration is obtained by the following process: the water sample of the wastewater to be treated is diluted according to a gradient to obtain samples with concentrations of 1, 1 / 2, 1 / 5, 1 / 10, 1 / 20, 1 / 50, and 1 / 100 of the concentration of the wastewater to be treated, respectively, the absorbance of all the samples is tested respectively, and then the absorbance of all the samples is linearly fitted with the corresponding concentrations to obtain a fitting curve of absorbance and concentration.

8. The processing method according to claim 7, characterized in that: All absorbances are absorbances at characteristic absorption wavelengths of the wastewater to be treated.

9. The processing method according to claim 8, characterized in that: The characteristic absorption wavelength is 280nm-320nm.

10. The processing method according to claim 1, characterized in that: The removal rate=(the real-time concentration-the initial concentration) / the adsorption time, and t is the adsorption time corresponding to the maximum removal rate.

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