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

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...

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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

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