(4) 聚丙烯酰胺絮凝劑預(yù)處置普通占整個污泥處置費用較高的比例，因而，聚丙烯酰胺的優(yōu)活動電流等。The synthesis and process physical properties of AM polyacrylamide: PAM is prepared by direct reaction of acrylonitrile with water under the action of framework copper catalyst, and then dried by ion exchange polymerization. The process is as follows: catalyst: catalytic hydration CH2 = CHCN + H2 humidity CH2 = CHCONH2 polymerization nCH2 = CHCONH2 - initiator - CH2CHCONH2
Industrial uses of polyacrylamide: Polyacrylamide (PAM) has high molecular weight, good water solubility, adjustable molecular weight, and can introduce various ionic groups to obtain specific properties. Low molecular weight is an effective additive or stabilizer for dispersing materials. High molecular weight is an important flocculant. It can produce hydrophilic and water-insoluble gel, which has good adhesion to many groups of surface and dissolved substances. Because of the above properties, PAM is widely used in flocculation, thickening, drag reduction, glue imitation, bonding, scale inhibition and other fields.
Anionic polyacrylamide can be used in different molecular weights according to different uses and user's requirements for product performance.
In industrial wastewater treatment, especially for suspended particles, coarser, high concentration, positive charged particles, neutral and alkaline wastewater such as iron and steel plant wastewater, electroplating plant wastewater, metallurgical wastewater, coal washing wastewater and other wastewater treatment effect is very good.
In drinking water treatment. The water source of many Waterworks in our country is low in mud and high in mineral content, which is turbid. Although it has been treated by precipitation, it still can not meet the requirements. Flocculants are needed to make the water quality clear. Many waterworks use inorganic flocculants, but the amount of inorganic flocculants is large, resulting in poor effect of sludge increase. Anionic polyacrylamide acrylamide monomer was 0.012%. The molecular weight of anionic PAM was 12.5 million and the content of acrylamide monomer was 0.013%. The concentration of two kinds of PAM is 0.05%. They are used after refrigeration for 24 hours.
(1) PAM pretreatment sludge takes lOml sludge and puts it into a 300 ml beaker. Six-unit mixers are used to mix at 1130 RPM speed for 30 seconds, and then the PAM is added to the sludge quickly and quantitatively. The PAM is stirred at lOOrpm speed for 30 seconds, then the speed of the mixer is reduced to 20-30 rpm and the slow stirring speed is 60 seconds to promote flocculation. The specific resistance of pretreated sludge, capillary water absorption time (CST), the viscosity of filtrate and the viscosity of centrifuge were measured.
(2) The specific resistance is tested by Brinell funnel according to the test method proposed by Coackley. The diameter of Brinell funnel is 80 mm. The filter paper is made of 70 mm medium speed filter paper. The vacuum degree of the test is controlled to 0.01 MPa. The experiment was repeated three times to get the average value.
(3) In order to reduce specific resistance and improve sludge dewatering effect, sludge should be pretreated before sludge dewatering. Sludge pretreatment methods include freeze-thaw pretreatment, heat treatment, acid treatment, alkali treatment, lime pretreatment and polymer flocculant pretreatment. Polymer flocculant polyacrylamide (PAM) pretreatment is the most widely used pretreatment method at home and abroad.
(5)實驗研討標(biāo)明：投加陽離可作為自來水廠污泥預(yù)處置藥劑的首選。
(6)依據(jù)CST值變化肯定PAM最投加率與測定比阻得到的最投加率分歧。并且CST值與比阻之間存在線性相關(guān)關(guān)系，比阻值越大，CST值越大，因而能夠采用CST值來近似替代污泥比阻反映污泥的脫水性能gricultural planting
The use of polyacrylamide as a water retaining agent is just as the name implies, to keep water content, reduce evaporation and ensure soil moisture as much as possible. During agricultural
planting, a large area of large-scale 2020已過半生意好壞凈水行業(yè)大老板們心中都有數(shù) 有寶的開幾十個店鋪 有做阿里的阿里是真差勁沒一點效果 阿里完全不扶持小微企業(yè) 貿(mào)易商 凈水材料在阿里上折騰了4年花了2萬多塊沒一點效果 本錢都沒掙回來啊 真?zhèn)?百度還好 就是點擊珍貴啊 百度點擊付費一個詞都是10塊左右 很多還都是浪費了 今年接觸的洗沙廠老板比較多 很多都是直接一句話 你來吧 做好 帶上一噸貨上機好了再說價格 來來回回幾千塊的費用哪能承擔(dān)得起啊 洗沙場一個月用3-5噸 大的10噸聚丙烯酰胺陰離子 本來幾個都亂了 各個廠家都是競爭價格不說利潤質(zhì)量 價格一壓再壓都到4000上了 您能買多多好的聚丙烯酰胺陰離子 陰離子1800萬分子量pam 不含稅8700左右 您買的4000 5000 都還說自己買的就是1800萬的 您的溶解比例您知道嗎 你噸水溶解了幾噸聚丙烯酰胺 江西的 湖南的湖北的各個老板都是 不知道是上過當(dāng)還是怎么 赤峰老板 1000多公里讓我去給你你服務(wù) 帶藥去 您可以不考慮這個成本 我們需要考慮的 什么叫生意合作 信任 您把我們這些做生意的當(dāng)什么了 上門服務(wù)的小JJ嗎 想做化工行業(yè)還得多方面發(fā)展 聚丙烯酰胺 已經(jīng)亂了 做點化工輔料吧 工業(yè)葡萄糖醋酸鈉 生化處理用的也不少 養(yǎng)菌種培菌碳源這種方法現(xiàn)在比較流行 因為無污染 不排污 處理標(biāo)準(zhǔn)高 近幾年各地推進的農(nóng)村改廁 污水集中處理 都是這樣的設(shè)備
ng wastewater.
The latest type of water treatment agent polyacrylamide, when treating sewage and water in many occasions, the combination of anionic polyacrylamide and cationic polyacrylamide has a very significant and synergistic effect than using one kind of ionic polyacrylamide alone. The ability of PAM to reduce surface tension is much greater than the ability of cations or anions existing alone under the same conditions. For the requirement of low surface tension, both anionic and cationic polyacrylamide need to be used at the same time. If they are used improperly, white precipitates will be produced and the effect of using them will be lost. PAM has the characteristics of amphoteric ions. It can complete the coordination of anions and cations. There is no precipitate on the surface. Especially, it is more convenient to use PAM as a flocculant because of the complex water quality or the changeable nature of water.
The sludge used in sewage pretreatment is taken from the sedimentation tank with Qiantang River water as its source of water, and PAC is used as a flocculant in the water plant. The sludge was naturally concentrated to a solid content of 2.7%-2.8%. The organic matter content in the sludge was 12.1%, SJ content was 52.1%, Al content was determined. The content was 20.2%. There are three types of PAM: cationic, anionic and nonionic. Non-ionic PAM dissolves slowly and is generally not used for sludge pretreatment. Therefore, only two representative cationic polyacrylamides and anionic polyacrylamides are selected in the experiment. The molecular weight of cationic PAM was 12 million and the content of
