• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
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    • 专利摘要:
    The present disclosure discloses a novel compounding method for high—efficiently removing phosphorus, comprising using a calcium carbide slag and polyferric sulfate (PFS) for coagulation— flocculation and sedimentation of a water sample in two stages, 5 firstly adding a certain amount of the calcium carbide slag to a phosphorus—containing water sample for pretreatment, and removing a sediment after the pretreatment is completed, to obtain an effluent; then adding a certain amount of polyferric sulfate (PFS) to the effluent for further reaction, and taking the effluent lO otained for determination and analysis, the concentration of phosphorus in the effluent reaches a Tier—1A discharge standard. The present disclosure uses the calcium carbide slag as a water treatment material, which effectively solves the problem of environmental pollution caused, by its accumulation in a large 15 amount, and brings good economic and social benefits. The combination of the calcium carbide slag with polyferric sulfate (PFS) can complement with each other, improve wastewater treatment effect, broaden. the scope of application, and reduce treatment costs. 20
    公开号:NL2028950A
    申请号:NL2028950
    申请日:2021-08-11
    公开日:2021-10-06
    发明作者:Li Yan；Tao Guiqing；Bai Jichi；Wang Zhemeng；Xiao Liping；Lan Yunlong；Shen Baohua
    申请人:Univ Liaoning Technical；Univ Qingdao Technology；Qingdao Ouyi Tiancheng Env Engineering Co Ltd；
    IPC主号:
    专利说明:

    NOVEL COMPOUNDING METHOD FOR HIGH-EFFICIENTLY REMOVING PHOSPHORUS
    TECHNICAL FIELD The present disclosure relates to the technical field of phosphorus-containing wastewater treatment, specifically relates to a novel compounding method for high-efficiently removing phos- phorus in a phosphorus-containing wastewater by the combined use of a calcium carbide slag and polyferric sulfate (PFS).
    BACKGROUND ART The excessive discharge of the phosphorus-containing wastewater is one of the factors for the serious eutrophication of water. The phosphorus-containing wastewater is mainly derived from the discharge due to the production of phosphorus chemicals by en- terprises, agricultural fertilization, manure wastewater from aq- uaculture, domestic wastewater, and the like. The main methods for removing phosphorus currently used include the chemical sedimenta- tion, adsorption, and biological methods. The chemical sedimenta- tion method has the advantages of stable operation, cost- effectiveness, and simplicity, which is one of the most effective and commonly-used methods for the treatment of the phosphorus- containing wastewater. Phosphorus mainly exists in the form of soluble orthophosphate which is the easiest to chemically sedi- ment. The phosphorus-removal agents commonly used in the chemical gedimentation method are: (1) calcium salts, such as CaCl, Ca (OH)., CaO, and the like; (2) aluminum salts, Al:S04, polyalumi- num chloride (PAC), and the like; (3) ferric salts, such as FeCls, polyferric sulfate (PFS), and the like. The effect of these meth- ods and agents on the phosphorus removal is also ideal, but other indicators of the treated wastewater still do not meet the stand- ard, requiring other agents to be added. The phosphorus-removal agents and auxiliary agents added make the cost even higher. If the traditional calcium method is used to remove phosphorus, the pH value of the effluent is higher. Thus, a large amount of acid is required to adjust the pH value, to make the effluent meet the discharge standard.
    Most of the industrial by-products are piled up in the open air, which waste the land resources and pollute the environment, such as calcium carbide slag, steel slag, red sludge, and fly ash.
    The calcium carbide slag is the waste slag with very fine particle size and evenly distribution, generated during the hydrolysis of calcium carbide to produce acetylene. It can be used directly without crushing, and has a large specific surface area, high ac- tivity, and high calcium content. The calcium carbide slag is mainly composed of calcium hydroxide and a small amount of calcium carbonate. Polyferric sulfate (PFS) is the most common inorganic polymer flocculant for the water treatment, and has the advantages of low price, good effect, and wide application. It is widely used in the field of the water treatment.
    SUMMARY In view of this, the present disclosure is to provide a novel compounding method for high-efficiently removing phosphorus, using a calcium carbide slag as a water treatment material, which effec- tively solves the problem of environmental pollution caused by its accumulation in a large amount, and brings good economic and so- cial benefits. The combination of the calcium carbide slag with polyferric sulfate (PFS) can complement with each other, improve wastewater treatment effect, broaden the scope of application, and reduce treatment costs.
    To solve the above technical problems, the present disclosure is achieved through the following technical solutions: The present disclosure provides the novel compounding method for high- efficiently removing phosphorus, including using the calcium car- bide slag and polyferric sulfate (PFS) for coagulation- flocculation and sedimentation of a water sample in two stages: firstly adding a certain amount of the calcium carbide slag to the water sample used as a simulation for pretreatment, and removing a sediment after the pretreatment is completed, to obtain an efflu- ent; then adding a certain amount of polyferric sulfate (PFS) to the effluent for further reaction, and taking the effluent ob- tained for determination and analysis; the concentration of phos-
    phorus in the effluent can reach a Tier-1A discharge standard.
    Optionally, the calcium carbide slag added is stirred at a rapid speed of 300 r/min for 1 min, a medium speed of 150 r/min for 2 min, and a slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment. Polyferric sulfate (PFS) added is stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for min, and then stood for 30 min to determine. The GT values of two combined coagulation-flocculation tests are both 21114, which 10 meet the reguirement of 10%-10°.
    Optionally, the calcium carbide slag is taken from an indus- trial waste slag generated when calcium carbide reacts with water to produce acetylene. The calcium carbide slag is mainly composed of Ca(OH), and a small amount of CaCO:. Main chemical compositions of the calcium carbide slag are: CaO, 89.94%; Si0,, 5.69%; Al-0;,
    2.81%; Fey,0:, 0.29%; and miscellaneous, 1.27%. The calcium carbide slag is placed in a blast drying oven to dry at 105°C for 2 h to a constant weight, and grinded to screen the calcium carbide slag with a size of 200 mesh for standby.
    Optionally, the content of ferrum in polyferric sulfate (PFS) is 18.5%. The highest content of impurities is: arsenic, 0.0008%; lead, 0.0015%; and insoluble matters, 0.5%, with a basicity of
    9.0%-14.0% and a pH value of 2.0-3.0.
    Opticnally, the calcium carbide slag and polyferric sulfate (PFS) are combined in two stages to sediment a phosphorus- containing wastewater with the pH value of 7 and the mass concen- tration of 1 mg/L-100 mg/L, to remove phosphorus. An addition amount of the calcium carbide slag in a first stage is 0.001 g/L-
    0.5 g/L, and an addition amount of polyferric sulfate in a second stage is 0.001 g/L-0.35 g/L. The concentration of phosphorus in the effluent is lower than 0.5 mg/L, and the effluent is in a neu- tral range with the turbidity lower than 5 NTU, which meets the requirement of the Tier-1A discharge standard.
    Compared with the prior art, the beneficial effects brought by the technical solution of the present disclosure are as fol- lows: The present disclosure uses the calcium carbide slag as a pretreatment material for the phosphorus-containing wastewater, to adjust the pH value of the phosphorus-containing wastewater with high, medium, and low concentrations by utilizing the high alka- linity of the calcium carbide slag. The calcium ions in the calci- um carbide slag reacts with phosphate ions in the wastewater under higher pH conditions to form the hydroxyapatite sediment. After the solid-liquid separation is carried out between the hydroxyap- atite sediment and the wastewater, most of phosphorus is removed. Polyferric sulfate (PFS) is added to the remaining wastewater, to react with the remaining phosphate ions in the wastewater to form ferric phosphate, and to neutralize the OH released by the remain- ing calcium carbide slag through the H* released by hydrolysis, for the coagulation-flocculation and sedimentation. Therefore, the phosphorus concentration, the pH value, and the residual turbidity of the effluent meet the Tier-1A discharge standard.
    The present disclosure uses the calcium carbide slag for pre- treatment, and the addition amount of polyferric sulfate (PFS) is also reduced for the secondary coagulation-flocculation, which greatly reduces the processing cost. It not only solves the prob- lem of the large accumulation amount of the calcium carbide slag and environmental pollution, but also realizes the utilization of the industrial waste, brining good economic and social benefits.
    DETAILED DESCRIPTION OF THE EMBODIMENTS The above description is only an overview of the technical solutions of the present disclosure. To understand the technical solutions of the present disclosure more clearly, it can be imple- mented in accordance with the content of the description. The pre- sent disclosure will be further described below in conjunction with the preferred examples to make the above and other objects, characteristics, and advantages more obvious and understandable.
    In the examples, the calcium carbide slag is taken from the industrial waste slag generated when calcium carbide reacts with water to produce acetylene. The calcium carbide slag is mainly composed of Ca(OH); and a small amount of CacO;. The main chemical compositions of the calcium carbide slag are: CaO, 89.94%; Si0;,
    5.69%; Al-03, 2.81%; Fe,0:, 0.29%; and miscellaneous, 1.27%. The calcium carbide slag is placed in a blast drying oven to dry at 105°C for 2 h to a constant weight, and grinded to screen the cal- cium carbide slag with a size of 200 mesh for standby.
    In the examples, polyferric sulfate (PFS) is taken from a 5 wastewater treatment plant in Shenyang municipality.
    The content of ferrum in polyferric sulfate (PFS) is 18.5%. The highest con- tent of impurities is: arsenic, 0.0008%; lead, 0.0015%; and insol- uble matters, 0.5%, with the basicity of 9.0%-14.0% and the pH value of 2.0-3.0. The method for determining each indicator in the present dis- closure and the examples are all conventional methods.
    Example 1 The calcium carbide slag and polyferric sulfate (PFS) are combined in two stages to sediment the phosphorus-containing wastewater with the pH value of 7 and the mass concentration of 30 mg/L, to remove phosphorus.
    The calcium carbide slag is firstly added in the simulated wastewater with an amount of 0.12 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment.
    Then, polyferric sulfate (PFS) is added in the simulated wastewater with an amount of 0.12 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min.
    After the reac- tion is completed, the phosphorus concentration in the effluent is determined to be 0.31 mg/L, the total phosphorus (TP) removal rate reaches 98.97%, the pH value of the effluent is 7.5, and the tur- bidity is 2.6 NTU, which meet the requirements of the Tier-1A dis- charge standard.
    Example 2 The calcium carbide slag and polyferric sulfate (PFS) are combined in two stages to sediment the phosphorus-containing wastewater with the pH value of 7 and the mass concentration of 50 mg/L, to remove phosphorus.
    The calcium carbide slag is firstly added in the simulated wastewater with an amount of 0.2 g/L, and stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment. Then, polyferric sulfate (PFS) is added in the simulated wastewater with an amount of 0.16 mg/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min. After the reaction is completed, the phosphorus concentration in the efflu- ent is determined to be 0.39 mg/L, the TP removal rate reaches
    99.22%, the pH value of the effluent is 7.8, and the turbidity is
    2.9 NTU, which meet the requirements of the Tier-1A discharge standard. Example 3 The calcium carbide slag and polyferric sulfate (PFS) are combined in two stages to sediment the phosphorus-containing wastewater with the pH value of 7 and the mass concentration of 100 mg/L, to remove phosphorus. The calcium carbide slag is first- ly added in the simulated wastewater with an amount of 0.4 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment. Then, polyferric sulfate (PFS) is added in the simulated wastewater with an amount of 0.35 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min. After the reac- tion is completed, the phosphorus concentration in the effluent is determined to be 0.35 mg/L, the TP removal rate reaches 99.65%, the pH value of the effluent is 7.7, and the turbidity is 3.6 NTU, which meet the requirements of the Tier-1A discharge standard. Example 4 The phosphorus-containing wastewater is taken from the inflow water of a wastewater plant of Buxin municipality, and the indica- tors are as follows: the chemical oxygen demand (COD) is 90 mg/L, the turbidity is 30.3 NTU, the phosphor content is 3.3 mg/L, and the pH value is 7.31. The calcium carbide slag and polyferric sul-
    fate (PFS) are combined in two stages to sediment to remove phos- phorus. The calcium carbide slag is firstly added in the simulated wastewater with an amount of 0.06 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment. Then, polyferric sulfate (PFS) is add- ed in the simulated wastewater with an amount of 0.04 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min. After the reaction is completed, the phos- phorus concentration in the effluent is determined to be 0.45 mg/L, the TP removal rate reaches 86.36%, the COD is 38 mg/L, the pH value of the effluent is 7.15, and the turbidity is 4.3 NTU, which meet the requirements of the Tier-1A discharge standard.
    Example 5 The phosphorus-containing wastewater is taken from the pro- duction process of an enterprise in Buxin municipality, and the indicators are as follows: the COD is 104 mg/L, the turbidity is
    37.7 NTU, the phosphor content is 10.16 mg/L, and the pH value is
    7.52. The calcium carbide slag and polyferric sulfate (PFS) are combined in two stages to sediment to remove phosphorus. The cal- cium carbide slag is firstly added in the simulated wastewater with an amount of 0.2 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min to remove the sediment. Then, polyferric sulfate (PFS) is added in the simu- lated wastewater with an amount of 0.16 g/L, stirred at the rapid speed of 300 r/min for 1 min, the medium speed of 150 r/min for 2 min, and the slow speed of 40 r/min for 10 min, and then stood for 30 min. After the reaction is completed, the phosphorus concentra- tion in the effluent is determined to be 0.47 mg/L, the TP removal rate reaches 95.37%, the COD is 36 mg/L, the pH value of the ef- fluent is 6.96, and the turbidity is 1.3 NTU, which meet the re- quirements of the Tier-1A discharge standard.
    The above examples are only the preferred examples of the present disclosure, and cannot be used to limit the scope of the claims of the present disclosure.
    It shall be pointed out that several modifications and changes still can be made by those ordi- nary skilled in the art without deviating from the principles of the present disclosure, which shall fall within the protection scope of the present disclosure.
    权利要求:
    Claims (5)
    [1]
    A mixing method for removing phosphorus in a highly efficient manner, comprising using a calcium carbide slag and polyferrisulfate (PFS) for coagulation-flocculation and sedimentation of a water sample in two phases: first adding a certain amount of the calcium carbide slag to the water sample used as a simulation for pretreatment, and removing a sediment after the pretreatment is completed, to obtain an effluent; then adding a predetermined amount of polyferric sulfate (PFS) to the effluent for further reaction, and taking the resulting effluent for determination and analysis; where a concentration of phosphorus in the effluent reaches a Tier-1A discharge standard.
    [2]
    The mixing method for removing phosphorus in a high efficiency according to claim 1, wherein the added calcium carbide slag is stirred at a high speed of 300 rpm for 1 min, stirred at an average speed of 150 rpm for 2 min. stirred and stirred at a slow speed of 40 r/min for 10 min, then left for 30 min to remove the sediment; then polyferrisulfate (PFS) is added and stirred at the high speed of 300 r/min for 1 min, at the medium speed of 150 r/min for 2 min, and at the low speed of 40 r/min for 1 min. ran 10 min, then left alone for 30 min to determine; where GT values of two combined coagulation-flocculation tests are both 21114, satisfying the requirement of 10-10".
    [3]
    The mixing method for removing phosphorus in a high efficiency according to claim 1, wherein the calcium carbide slag is taken from an industrial waste slag generated when calcium carbide reacts with water to produce acetylene; wherein the calcium carbide slag consists mainly of Ca(OH). and a small amount of CaCO:; wherein the main chemical compositions of the calcium carbide slag are: CaO, 89.94%; SiO;, 5.69%; Al:0:, 2.81%; Fe:0: , 0.29%; and various, 1.27%; wherein the calcium carbide slag is placed in a blast furnace to dry to constant weight at 105°C for 2 hours, and ground to screen the 200 mesh size calcium carbide slag for storage.
    [4]
    The mixing method for removing phosphorus in a high efficiency according to claim 1, wherein a content of iron in polyferric sulfate (PFS) is 18.5%; the highest impurity content is: arsenic, 0.0008%; lead, 0.0015 %; and insolubles, 0.5%, having a basicity of 9.03-14.0% and a pH of 2.0-3.0.
    [5]
    The mixing method for removing phosphorus in a high efficiency according to claim 1, wherein the calcium carbide slag and polyferric sulfate (PFS) are combined to use in two steps to produce a phosphorus-containing waste water having a pH of 7 and a subjecting mass concentration of 1 mg/L-100 mg/L to sedimentation to remove phosphorus; wherein an amount of the calcium carbide slag to be added in a first step is 0.001 g/L - 0.5 g/L, and an amount of polyferric sulfate to be added in a second step is 0.001 g/L - 0.35 g/L is; where the concentration of phosphorus in the effluent is less than 0.5 mg/L and the effluent is in a neutral range with a turbidity less than 5 NTU, which meets the requirement of the Tier-1A discharge standard.
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    同族专利:
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    CN112079421A|2020-12-15|
    引用文献:
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    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    CN202010922853.6A|CN112079421A|2020-09-04|2020-09-04|Novel composite efficient phosphorus removal method|
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