Sewage treatment equipment and method for preventing adsorbent clogging and hardening

A sewage treatment method and adsorbent technology, which are applied in water/sewage treatment, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc., can solve the problem of increasing treatment procedures and costs, wasting resources, and increasing swelling. and other problems, so as to avoid the increase of operating costs and investment costs, increase operating costs and investment costs, and resist water quality fluctuations.

Active Publication Date: 2021-06-18
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in practical application, when the resin is cleaned too frequently, it will cause degradation of the resin, increase the expansion degree, and be easily broken, and a large amount of acid and water are needed for cleaning, which wastes resources, and the use of pickling requires a separate acid-resistant device. , pipelines, etc., and the container containing the adsorbent also needs to be treated with acid resistance. Therefore, in practical applications, the pickling step will increase the treatment process and cost. How to solve the problem of hardening and clogging of the adsorbent at the lowest cost has become a priority in sewage treatment. Problems to be solved in the field of adsorption
[0008] To sum up, how to overcome the complexity and high cost of pickling in the prior art, prevent the adsorbent in the adsorption unit from being clogged and hardened by the precipitation of pollutants, and improve the use efficiency of the adsorbent without additional Increasing the amount of wastewater in process treatment is an urgent problem to be solved in the application of coagulation-sedimentation-adsorption process in industrial water treatment

Method used

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  • Sewage treatment equipment and method for preventing adsorbent clogging and hardening
  • Sewage treatment equipment and method for preventing adsorbent clogging and hardening
  • Sewage treatment equipment and method for preventing adsorbent clogging and hardening

Examples

Experimental program
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Effect test

Embodiment 1

[0048] like figure 2 As shown, a kind of sewage treatment method that prevents adsorbent clogging and hardening of the present embodiment, treats the sewage that is the same as Comparative Example 1 and has the same treatment capacity, and its steps are:

[0049] (1) Make the sewage to be treated flow into the primary sedimentation tank, and add Ca(OH) with a mass percentage of 10% 2 , Ca(OH) 2 The dosage is 2.68m 3 / d (0.89% of sewage treatment capacity), stir evenly and carry out fast precipitation, react 10min;

[0050] (2) After the mixed reaction in step (1), the effluent flows into the secondary sedimentation unit (flocculation sedimentation tank), and polyacrylamide with a mass percentage of 1‰ is added to the flocculation sedimentation tank, and the dosage of polyacrylamide is 0.75m 3 / d (0.25%), stir evenly to carry out flocculation reaction for 30 minutes, and let stand for 90 minutes to slowly precipitate;

[0051] (3) The supernatant after the precipitation of...

Embodiment 2

[0064] like figure 2 As shown, a kind of sewage treatment method that prevents adsorbent clogging and hardening of the present embodiment, and comparative example 2 handles the sewage of the same type and the same treatment capacity and adopts the same adsorbent, and its treatment process is the same as embodiment 1, the difference is that :

[0065] The coagulant uses polyaluminum chloride (PAC) with a mass percentage of 20%, and the dosage is 0.3m 3 / d; the mass percent of coagulant PAM is 0.5‰, and the dosage is 0.6m 3 / d; after it was left to settle for 120min, the supernatant liquid entered the adsorption tower; 15% of the adsorbed water in the step (3) was returned to before the adsorption tower in the step (3) by the reflux pipeline.

[0066] When the adsorbent reaches a breakthrough when the water volume is about 400BV, it needs to be washed once with 1% hydrochloric acid by mass.

[0067] To traditional coagulation-precipitation-adsorption method (comparative exam...

Embodiment 3

[0077] like figure 2 As shown, a kind of sewage treatment method that prevents adsorbent clogging and hardening of the present embodiment, and comparative example 3 handles the sewage of the same type and the same treatment capacity and adopts the same adsorbent, and its treatment process is the same as embodiment 1, the difference is that :

[0078] The coagulant uses polyaluminum chloride with a mass percentage of 1%, and the dosage is 6m 3 / d; coagulant PAM mass percentage is 2‰, dosage is 0.3m 3 / d; after it was left to settle for 90min, the supernatant liquid entered the adsorption tower; 20% of the adsorption water in step (3) was returned to before the adsorption tower in step (3) by the reflux pipeline.

[0079] When the volume of water entering the adsorbent is about 1900BV, it reaches breakthrough, and it needs to be washed once with 1% hydrochloric acid by mass.

[0080] To traditional coagulation-precipitation-adsorption method (comparative example 3, such as ...

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Abstract

The invention discloses a sewage treatment device and method for preventing adsorbent clogging and hardening, and belongs to the technical field of waste water treatment. In the sewage treatment method of the present invention, first, a coagulant is added to the primary precipitation unit to carry out rapid precipitation reaction, after the rapid precipitation reaction, the effluent flows into the secondary precipitation unit, and then a coagulant is added to carry out the flocculation reaction, and then after the flocculation reaction is slowly precipitated The supernatant liquid enters the adsorption unit for adsorption and decontamination. Part of the adsorbed effluent is fully mixed with the supernatant effluent after flocculation and sedimentation before returning to the adsorption unit, and then flows into the adsorption unit. row or enter the next processing unit for processing. The invention prevents the saturated or supersaturated influent before the adsorption unit from causing precipitation in the adsorption unit to block the adsorbent or harden the adsorbent; and there is no additional increase in the amount of waste water, the operation is simple, the use efficiency of the adsorbent is effectively improved, and the sewage is reduced Handle operating costs.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a sewage treatment equipment and method for preventing adsorbent clogging and hardening. Background technique [0002] In recent years, the problem of water pollution in my country has become increasingly serious. With the rapid development of economy and society, water pollution in some river basins is showing a trend of increasing. Various complex pollutants lead to the decline of water environment quality, the damage of water ecosystem, and the increase of environmental hidden dangers. On the one hand, water resources are scarce in the central, western and northern areas, which require advanced treatment of urban sewage and industrial wastewater to increase the recycling rate. On the other hand, the problem of drinking water safety has become increasingly prominent. There are more and more trace organic pollutants with biological toxicity. The implementa...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04
CPCC02F1/281C02F1/283C02F1/42C02F1/5236C02F1/56C02F2301/08
Inventor 张炜铭张延扬单超朱兆坚林原花铭潘丙才吕路
Owner NANJING UNIV
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