Phosphorus-free scale inhibition dispersant for sewage treatment, and preparation method thereof

A phosphorus-free scale inhibition and sewage treatment technology, applied in water/sludge/sewage treatment, special treatment targets, chemical instruments and methods, etc., can solve problems such as reactor collapse, high operating costs, and reactor acidification, and achieve Prevent sludge calcification, prevent equipment fouling, good overall performance

Pending Publication Date: 2020-07-24
嘉兴天兴环保技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there are two problems in this operation: firstly, the operating cost is high, and the pH value of the effluent of the anaerobic reactor is generally around 7.1, so more acid needs to be added to increase the operating cost; secondly, the dosage of acid is difficult to control, The effect of adding less is not obvious, and adding more will easily cause the activity of methanogens to be inhibited, and the reactor will be acidified, resulting in the collapse of the reactor. The inventors have found that: polymaleic anhydride, benzotriazole, zinc nitrate, The combination of polyacrylic acid, polyepoxysuccinic acid and sodium gluconate has good enough performance, especially for preventing anaerobic granular sludge from scaling, and can effectively prevent calcium Ion interception in an anaerobic reactor

Method used

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  • Phosphorus-free scale inhibition dispersant for sewage treatment, and preparation method thereof
  • Phosphorus-free scale inhibition dispersant for sewage treatment, and preparation method thereof
  • Phosphorus-free scale inhibition dispersant for sewage treatment, and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0019] A phosphorus-free scale inhibitor dispersant for sewage treatment, consisting of the following raw materials in parts by mass:

[0020]

[0021] A preparation method of a phosphorus-free scale inhibitor dispersant for sewage treatment, comprising 46 parts of polymaleic anhydride, 28 parts of benzotriazole, 43 parts of zinc nitrate, 11 parts of polyacrylic acid, 18 parts of polyoxysuccinic acid, 3 parts Sodium gluconate and 0.8 parts of deionized water were placed in a reaction kettle, stirred and mixed at 70° C. for 1.5 hours to obtain a phosphorus-free scale inhibitor dispersant for sewage treatment.

Embodiment 2

[0023] A phosphorus-free scale inhibitor dispersant for sewage treatment, consisting of the following raw materials in parts by mass:

[0024]

[0025]

[0026] A preparation method of non-phosphorous scale inhibitor dispersant for sewage treatment, comprising 42 parts of polymaleic anhydride, 30 parts of benzotriazole, 45 parts of zinc nitrate, 16 parts of polyacrylic acid, 15 parts of polyoxysuccinic acid, 2 parts Sodium gluconate and 1.2 parts of deionized water were mixed and placed in a reaction kettle, stirred and mixed at 65°C for 2 hours to obtain a phosphorus-free scale inhibitor dispersant for sewage treatment.

Embodiment

[0028] Factory A is a waste paper and paper mill, mainly producing containerboard paper. Due to the high content of calcium ions in the raw materials and the large amount of recycled water used, the concentration of calcium ions in the wastewater discharged into the sewage treatment plant reaches 800-1000mg / L. The scale of calcium ion in the anaerobic reactor is very high, reaching about 400mg / L, so the internal scaling is serious, and the diameter of the outlet pipe is reduced from DN600 to about 200. At the same time, the anaerobic granular sludge is severely calcified, and the ash content reaches more than 70%. The removal efficiency of the anaerobic section drops to about 60%, and it is necessary to discharge the calcified sludge frequently and purchase granular sludge to maintain the operation of the anaerobic reactor. In order to alleviate the calcification problem, after negotiation, factory A agreed to try out the non-phosphorus scale inhibitor dispersant, and authorize...

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Abstract

The invention discloses a phosphorus-free scale inhibition dispersant for sewage treatment. The phosphorus-free scale inhibition dispersant is prepared from the following raw materials in parts by mass: 30 to 50 parts of polymaleic anhydride; 20 to 30 parts of benzotriazole; 40 to 50 parts of zinc nitrate; 5 to 15 parts of polyacrylic acid; 10 to 20 parts of polyoxosuccinic acid; 1 to 5 parts of sodium gluconate; and 0.8 to 1.2 parts of deionized water. The invention further discloses a preparation method of the phosphorus-free scale inhibition dispersant for sewage treatment, wherein the preparation method is characterized by comprising the following steps: uniformly mixing polymaleic anhydride, benzotriazole, zinc nitrate, polyacrylic acid, polyoxosuccinic acid, sodium gluconate and deionized water. Compared with the prior art, the phosphorus-free scale inhibition dispersant of the invention has the advantages that interception of calcium ions in an anaerobic reactor can be effectively reduced, the problems of pipeline scaling of an anaerobic reactor and calcification of anaerobic granular sludge in a high-calcium environment can be fundamentally solved, and the phosphorus-free scale inhibition dispersant is low in operation cost.

Description

【Technical field】 [0001] The invention relates to the technical field of sewage treatment, in particular to a phosphorus-free scale inhibitor dispersant for sewage treatment and a preparation method thereof. 【Background technique】 [0002] The development of scale inhibitors has gone through several stages of inorganic polyphosphates, organic phosphates, polycarboxylic acids, binary and ternary phosphorus-containing copolymers and binary ternary phosphorus-free copolymers until the early 1990s. The Scale Antiscalants of Lin series still account for a large proportion. High scaling can seriously affect the equipment used in most wastewater treatment technologies, thereby affecting the wastewater treatment effect and treatment efficiency. More importantly, the antiscalant cannot affect the reproduction of microorganisms, which requires that the antiscalant does not contain ions that disrupt the stable operation of the biochemical system. At the same time, many antiscalants o...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F5/12
CPCC02F5/125C02F2303/08
Inventor 朱玉英
Owner 嘉兴天兴环保技术有限公司
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