Method for preparing flocculating agent from paper mill sludge
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A papermaking sludge and flocculant technology, applied in sludge treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., to achieve the effects of environmental protection, simple production method and high flocculation efficiency
Active Publication Date: 2012-07-18
SHANDONG UNIV
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However, the related technology of synthesizing flocculant with papermaking sludge as raw material has not been reported yet.
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Embodiment 1
[0027] The preparation of the flocculant (L-AM) of embodiment 1. different initiator additions
[0028] Weigh 2.0g of papermaking sludge, add 60ml of deionized water and 10% NaOH solution, stir to stabilize the pH at about 11.5, after about 40min the pH remains basically unchanged, centrifuge at 8000rpm for 5min, take the supernatant, and adjust the pH to 7.5 , put the reactor into a water bath at 70°C, stir for 3min to 5min, add the initiator potassium peroxodisulfate, the amount of the initiator is 30mg, 50mg, 70mg, 100mg respectively, pass nitrogen to exhaust the air, after 15min, add 6g For acrylamide monomer, pass nitrogen gas for about 3 minutes to 5 minutes, and continue to react at 70°C for 3 hours. After the reaction, the product was cooled to room temperature, and 500ml of acetone was added to precipitate the product, vacuum filtered, and the filter residue was vacuum-dried at 50°C to obtain five products with different initiator dosages.
Embodiment 2
[0029] Example 2. Preparation of flocculants (L-AM) with different acrylamide additions
[0030] The same as described in Example 1, except that the amount of the initiator is fixed at 50 mg, and the amount of acrylamide is respectively 3 g, 4 g, 5 g, and 6 g, so that flocculant products with different addition amounts of acrylamide are obtained.
Embodiment 3
[0031] Example 3. Preparation of flocculant (L-AM) under different synthetic pH environments
[0032] The same as that described in Example 2, except that the amount of acrylamide was fixed at 5 g, and the pH of the supernatant was adjusted to 3.5, 5.5, 7.5, and 9.5, respectively, to obtain flocculant products under different reaction pH environments.
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Abstract
The invention relates to a method for preparing a flocculating agent from paper mill sludge. The method comprises the following steps: raw material is not purified, an alkali liquor is directly used for dissolving lignin, a supernatant is separated out, the PH value of the supernatant is regulated, after a reactor is heated to a certain temperature, potassium persulfate is added, nitrogen gas is filled, the stirring and the activating are performed for 15 minutes, and then acrylamide is added in the reactor, nitrogen gas is filled continuously, the stirring reaction is conducted, acetone is added to mix to separate out reaction products, the vacuum drawing and filtering is performed, and filtered slag is taken to conduct the vacuum drying to obtain the flocculating agent product. When theprepared flocculating agent is used for treating water samples, the adding quantity is 2 mg / l, the UV254 removal rate reaches about 70%, and the DOC removal rate reaches about 60%. The method provided by the invention has the advantages that the process is simple, the reaction condition is mild, the waste reuse is achieved and the use amount of the prepared flocculating agent is small through theindustrial production and appliance, the efficiency is high, and the cost of water treatment is low.
Description
technical field [0001] The invention relates to a method for synthesizing a flocculant by using sludge produced in an alkaline papermaking process as a main raw material, and belongs to the technical field of waste resource utilization and water treatment flocculants. technical background [0002] With the continuous rapid growth of population, people's demand for water resources is also increasing. Especially in my country, a country with scarce water resources, uneven distribution and large population, water resources are particularly important. In addition, due to various reasons, the pollution of water resources is becoming more and more serious, which further aggravates the contradiction of water shortage. [0003] After the problem of water resource pollution arose, various methods of sewage treatment emerged as the times require, and experienced a period of rapid development. Coagulation is an important link in the water treatment process. Although it is often used ...
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