Method for rapidly evaluating quality of sludge conditioning and dewatering inorganic agent

Abstract

The invention belongs to the field of sewage treatment, and discloses a method for rapidly evaluating the quality of a sludge conditioning and dewatering inorganic agent. Taking the stock solution conductivity of the to-be-detected inorganic agent and the diluent conductivity of the to-be-detected inorganic agent as indexes for rapidly evaluating the quality of the sludge conditioning and dewatering inorganic agent; obtaining a stock solution conductivity test result of the to-be-tested inorganic agent and a diluent conductivity test result of the to-be-tested inorganic agent; and comparing the stock solution conductivity test result of the to-be-tested inorganic agent and the diluent conductivity test result of the to-be-tested inorganic agent with the stock solution conductivity parameter and the diluent conductivity parameter respectively so as to evaluate the quality of the to-be-tested inorganic agent and / or screen the inorganic agent which can be used as the sludge conditioning and dewatering inorganic agent. The method provided by the invention can rapidly and effectively evaluate the quality of the sludge conditioning dehydration inorganic agent.

Description

Technical Field

[0001] The invention belongs to the field of sewage treatment, and more specifically, relates to a method for quickly evaluating the quality of inorganic agents for sludge conditioning and dehydration. Background Art

[0002] Sludge conditioning and dehydration is a critical step in the sewage treatment process, which directly affects the reduction, stabilization and subsequent treatment and disposal costs and efficiency of sludge. Inorganic agents play an important role in sludge conditioning and dehydration. At present, sludge conditioning and dehydration mostly use aluminum-iron inorganic agents, which can achieve the purpose of sludge hydrophobicity conditioning and deep dehydration by conducting electrical neutralization reaction on sludge.

[0003] In the face of how to select and evaluate the appropriate inorganic agents, and how to quickly determine whether each batch of agents entering the factory meets the standards, rapid testing indicators and testing methods have become a sharp sword in our hands. These methods can quickly evaluate the effect and dehydration performance of the agents, which is crucial for optimizing the conditioning and dehydration process.

[0004] However, in actual operation, the sludge dehydration chemicals of sewage treatment plants are usually transported to the plant in trucks, and each truck weighs about 30 tons. For a medium or large sludge treatment center, more than 5 to 10 trucks of chemicals enter the plant every day. If each truck of chemicals needs to be sampled and sent to a third party for monitoring, not only will the testing cost be high, but the traditional testing cycle is as long as a week, which obviously cannot meet our urgent need for fast testing speed.

[0005] There are currently a series of national standards and industry standards for sludge conditioning and dewatering agents as references, such as "Water Treatment Agent Polyaluminium Chloride" (GBT 22627-2022), "Water Treatment Agent Polyaluminium Ferric Chloride" (HGT5359-2018), "Polyferric Sulfate" (GBT14591-2016) and "Polyferric Chloride" (HGT4672-2014), etc., which provide authoritative evaluation criteria for the quality of agents. These challenging indicators are active ingredients, basicity, pH, density, insoluble matter, heavy metal pollutants, etc. Under normal circumstances, the active ingredients and basicity in the agent indicators are the key indicators for evaluating whether the agent can meet the performance requirements; indicators such as heavy metals are to limit the control indicators of pollutants entering the sewage treatment plant. Therefore, the first thing to be solved during the acceptance of the plant is whether the agent can meet the production efficiency requirements, and then further limit the pollutant control indicators through witness sampling and third-party monitoring.

[0006] In order to improve the efficiency of detection and reduce costs, sewage treatment plants often use small-scale laboratory simulation tests to determine whether the chemicals entering the plant can meet the production application requirements. Compared with traditional third-party testing, this method can significantly shorten the detection cycle. However, this method is limited by many factors such as mud quality, chemical dosage, matching chemicals, personnel, equipment, etc., and cannot be used alone as an objective evaluation or control indicator for chemical acceptance.

[0007] Therefore, it is urgent to propose a rapid quality assessment method for sludge conditioning and dewatering inorganic agents. Summary of the invention

[0008] The purpose of the invention is to solve the technical problem of lack of rapid evaluation index for quality acceptance of sludge conditioning agents entering sewage treatment plants, and to propose a rapid quality evaluation method for sludge conditioning and dehydration inorganic agents.

[0009] In order to achieve the above object, the present invention provides a method for quickly evaluating the quality of inorganic agents for sludge conditioning and dehydration, the method comprising:

[0010] The conductivity of the original solution of the inorganic agent to be tested and the conductivity of the diluted solution of the inorganic agent to be tested are used as indicators for rapid evaluation of the quality of the inorganic agent for sludge conditioning and dehydration;

[0011] Obtaining the conductivity test results of the original solution of the inorganic agent to be tested and the conductivity test results of the diluted solution of the inorganic agent to be tested;

[0012] Set the conductivity parameters of the original solution and the dilution solution;

[0013] The conductivity test results of the original solution of the inorganic agent to be tested and the conductivity test results of the diluted solution of the inorganic agent to be tested are compared with the conductivity parameters of the original solution and the conductivity parameters of the diluted solution respectively, so as to evaluate the quality of the inorganic agent to be tested and / or screen the inorganic agent that can be used as the inorganic agent for sludge conditioning and dewatering.

[0014] According to the present invention, preferably, the diluent of the inorganic agent to be tested is prepared by mixing the inorganic agent to be tested with a diluent.

[0015] According to the present invention, preferably, the diluent is deionized water and / or tap water, and the conductivity of the diluent is ≤400 μS / cm.

[0016] According to the present invention, preferably, the volume ratio of the inorganic agent to be tested to the diluent is 1:(80-120), preferably 1:100.

[0017] According to the present invention, preferably, the conductivity parameter of the stock solution is 100-120 mS / cm, preferably 110 mS / cm.

[0018] According to the present invention, preferably, the conductivity parameter of the diluent is 4-6 mS / cm, preferably 5.5 mS / cm.

[0019] According to the present invention, preferably, when the test result of the original solution conductivity of the inorganic agent to be tested is ≥ the original solution conductivity parameter, and the test result of the diluted liquid conductivity of the inorganic agent to be tested is ≤ the diluted liquid conductivity parameter, the inorganic agent to be tested is a qualified inorganic agent and can be used as an inorganic agent for sludge conditioning and dewatering.

[0020] According to the present invention, preferably, the device used for testing conductivity comprises a conductivity meter, and the conductivity meter is provided with a glass bulb type probe.

[0021] According to the present invention, preferably, the test range of the conductivity is 0.00 μS / cm-200.00 mS / cm, with an accuracy of ±1.0%.

[0022] According to the present invention, preferably, the inorganic agent to be tested is an aluminum-iron inorganic agent for sludge conditioning, preferably polyaluminum chloride and / or polyaluminum-ferric chloride.

[0023] The beneficial effects of the technical solution of the present invention are as follows:

[0024] The present invention solves the technical problem of lack of rapid assessment indicators for quality acceptance of sludge conditioning agents entering a sewage treatment plant, provides a rapid assessment method for the quality of sludge conditioning and dehydration inorganic agents from the perspective of conductivity, and provides specific control indicators and parameters. Through rapid detection of two conductivity characteristic indicators, the quality of the sludge conditioning and dehydration inorganic agents can be rapidly assessed to determine whether they can meet production applications and whether agent acceptance can be carried out.

[0025] The method of the present invention can quickly and effectively evaluate the quality of inorganic agents for sludge conditioning and dehydration, and can be used as a screening control indicator for inorganic agents for sludge conditioning and dehydration, and can also be used as a rapid testing and verification indicator for the quality of inorganic agents entering a sewage treatment plant for sludge dehydration, which is simple, fast, economical and efficient.

[0026] Other features and advantages of the present invention will be described in detail in the following detailed description. DETAILED DESCRIPTION

[0027] The preferred embodiments of the present invention will be described in more detail below. Although the preferred embodiments of the present invention are described below, it should be understood that the present invention can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present invention more thorough and complete, and to fully convey the scope of the present invention to those skilled in the art.

[0028] Example 1

[0029] This embodiment provides a method for quickly evaluating the quality of inorganic agents for sludge conditioning and dehydration, the method comprising:

[0030] The conductivity of the original solution of the inorganic agent to be tested and the conductivity of the diluted solution of the inorganic agent to be tested are used as indicators for rapid evaluation of the quality of the inorganic agent for sludge conditioning and dehydration;

[0031] The conductivity test result EC(0) of the original solution of the inorganic agent to be tested and the conductivity test result EC(1 / 100) of the diluted solution of the inorganic agent to be tested are obtained; wherein the diluted solution of the inorganic agent to be tested is prepared by mixing the inorganic agent to be tested with tap water (with a conductivity of 359 μS / cm) at a dosage volume ratio of 1:100; the equipment used for testing the conductivity includes a conductivity meter, and the conductivity meter is provided with a glass bulb probe. The test range of the conductivity is 0.00 μS / cm-200.00 mS / cm, with an accuracy of ±1.0%.

[0032] Set the conductivity parameter of the stock solution to 110 mS / cm and the conductivity parameter of the dilution solution to 5.5 mS / cm;

[0033] The test results EC(0) of the original solution conductivity of the inorganic agent to be tested and the test results EC(1 / 100) of the diluted solution conductivity of the inorganic agent to be tested are compared with the original solution conductivity parameter and the diluted solution conductivity parameter, respectively, so as to evaluate the quality of the inorganic agent to be tested and / or screen the inorganic agent that can be used as the inorganic agent for sludge conditioning and dewatering. Specifically, when the test results EC(0) of the original solution conductivity of the inorganic agent to be tested is ≥ the original solution conductivity parameter, and at the same time, the test results EC(1 / 100) of the diluted solution conductivity of the inorganic agent to be tested is ≤ the diluted solution conductivity parameter, the inorganic agent to be tested is a qualified inorganic agent and can be used as the inorganic agent for sludge conditioning and dewatering.

[0034] In this embodiment, the inorganic agent to be tested is an aluminum-iron inorganic agent for sludge conditioning (other test results: basicity 59%, Al2O3: 10.1%, Fe: 1.3%), the original solution conductivity test result EC(0) of the inorganic agent to be tested is 115.7mS / cm, and the diluted solution conductivity test result EC(1 / 100) of the inorganic agent to be tested is 5.13mS / cm; it satisfies EC(0)≥110mS / cm and EC(1 / 100)≤5.5mS / cm, and can be used as an inorganic agent for sludge conditioning and dehydration.

[0035] Example 2

[0036] The difference between this embodiment and embodiment 1 is only that:

[0037] In this embodiment, the inorganic agent to be tested is an aluminum-iron inorganic agent for sludge conditioning (other test results: basicity 67%, Al2O3: 10.6%, Fe: 1.1%);

[0038] The conductivity test result of the original solution of the inorganic agent to be tested, EC(0), is 124.2 mS / cm;

[0039] The conductivity test result of the diluted solution of the inorganic agent to be tested, EC (1 / 100), is 5.00 mS / cm;

[0040] It meets the requirements of EC(0)≥110mS / cm and EC(1 / 100)≤5.5mS / cm and can be used as an inorganic agent for sludge conditioning and dehydration.

[0041] Example 3

[0042] The difference between this embodiment and embodiment 1 is only that:

[0043] In this embodiment, the inorganic agent to be tested is an aluminum-iron inorganic agent for sludge conditioning (other test results: basicity 76%, Al2O3: 10.8%, Fe: 1.2%);

[0044] The conductivity test result of the original solution of the inorganic agent to be tested, EC(0), is 122.2 mS / cm;

[0045] The conductivity of the diluent tap water is 342μS / cm, and the conductivity test result EC(1 / 100) of the diluent of the inorganic agent to be tested is 4.20mS / cm;

[0046] It meets the requirements of EC(0)≥110mS / cm and EC(1 / 100)≤5.5mS / cm and can be used as an inorganic agent for sludge conditioning and dehydration.

[0047] The embodiments of the present invention have been described above, and the above description is exemplary, not exhaustive, and is not limited to the disclosed embodiments. Many modifications and changes will be apparent to those skilled in the art without departing from the scope and spirit of the described embodiments.

Claims

1. A method for rapid assessment of the quality of inorganic agents for sludge conditioning and dehydration, characterized in that: The method comprises: The conductivity of the original solution of the inorganic agent to be tested and the conductivity of the diluted solution of the inorganic agent to be tested are used as indicators for rapid evaluation of the quality of the inorganic agent for sludge conditioning and dehydration; Obtaining the conductivity test results of the original solution of the inorganic agent to be tested and the conductivity test results of the diluted solution of the inorganic agent to be tested; Set the conductivity parameters of the original solution and the dilution solution; The conductivity test results of the original solution of the inorganic agent to be tested and the conductivity test results of the diluted solution of the inorganic agent to be tested are compared with the conductivity parameters of the original solution and the conductivity parameters of the diluted solution respectively, so as to evaluate the quality of the inorganic agent to be tested and / or screen the inorganic agent that can be used as the inorganic agent for sludge conditioning and dewatering.

2. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 1, wherein: The diluent of the inorganic agent to be tested is prepared by mixing the inorganic agent to be tested with a diluent.

3. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 2, wherein: The diluent is deionized water and / or tap water, and the conductivity of the diluent is ≤400 μS / cm.

4. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 2, wherein: The volume ratio of the inorganic agent to be tested to the diluent is 1:(80-120).

5. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 2, wherein: The conductivity parameter of the stock solution is 100-120 mS / cm.

6. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 2, wherein: The conductivity parameter of the dilution liquid is 4-6 mS / cm.

7. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to any one of claims 1 to 6, wherein: When the test result of the original solution conductivity of the inorganic agent to be tested is ≥ the original solution conductivity parameter, and the test result of the diluted solution conductivity of the inorganic agent to be tested is ≤ the diluted solution conductivity parameter, the inorganic agent to be tested is a qualified inorganic agent and can be used as an inorganic agent for sludge conditioning and dehydration.

8. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 1, wherein: The equipment used for testing the conductivity includes a conductivity meter provided with a glass bulb-type probe.

9. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 1, wherein: The test range of conductivity is 0.00μS / cm-200.00mS / cm, with an accuracy of ±1.0%.

10. The method for rapid quality assessment of inorganic agents for sludge conditioning and dehydration according to claim 1, wherein: The inorganic agent to be tested is an aluminum-iron inorganic agent for sludge conditioning, preferably polyaluminum chloride and / or polyaluminum-ferric chloride.