本文關(guān)鍵詞：藍(lán)藻腐爛特性及其加壓結(jié)團(tuán)絮凝沉淀濃縮技術(shù)研究　出處：《揚(yáng)州大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

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【摘要】：為了提高藍(lán)藻漿濃縮效率,降低能耗,采用外加壓力壓破藍(lán)藻氣囊,使藍(lán)藻失去氣囊浮力易于沉淀分離。本文主要關(guān)注并研究了藍(lán)藻的腐爛特性以及藍(lán)藻加壓后結(jié)團(tuán)絮凝沉淀濃縮效果,并在此基礎(chǔ)上進(jìn)行加壓加壓結(jié)團(tuán)絮凝沉淀濃縮湖泊藍(lán)藻工藝動(dòng)態(tài)試驗(yàn),從而得到一種安全、高效、經(jīng)濟(jì)的藍(lán)藻水分離處理工藝。(1)研究了不同溫度下藍(lán)藻的腐爛過程,將藍(lán)藻漿分別放置于25℃、30℃、35℃的恒溫培養(yǎng)箱中培養(yǎng),間隔一定時(shí)間觀察藍(lán)藻性狀,取樣測(cè)定藍(lán)藻殘余葉綠素量,用于表征藍(lán)藻腐爛程度。測(cè)定藍(lán)藻過濾液中的TOC、TN、TP等水質(zhì)指標(biāo),表征藍(lán)藻腐爛、藻細(xì)胞破爛后向水中釋放污染物的量,間接反映藍(lán)藻腐爛程度。當(dāng)培養(yǎng)溫度為25℃時(shí),藍(lán)藻腐爛度和污染物釋放量在開始培養(yǎng)后的108h內(nèi)并沒有明顯的變化,而在隨后的96h內(nèi)腐爛度和污染物釋放量開始逐漸增大,整個(gè)腐爛過程較慢且需要7.5d才能完全腐爛;當(dāng)培養(yǎng)溫度為30℃時(shí),藍(lán)藻腐爛度和污染物釋放量在開始培養(yǎng)后的12h內(nèi)有較大幅度的變化,之后的36h內(nèi)變化減小隨后藍(lán)藻腐爛度和污染物釋放量重新增大,整個(gè)腐爛過程較快只需要3.5d就完全腐爛;當(dāng)培養(yǎng)溫度為35℃時(shí),藍(lán)藻腐爛度和污染物釋放量在開始培養(yǎng)后的24h內(nèi)就快速增高直至穩(wěn)定,整個(gè)腐爛過程極快僅需1d就完全腐爛。(2)通過靜態(tài)實(shí)驗(yàn)研究了不同腐爛程度藍(lán)藻漿混凝沉淀性能,將藍(lán)藻漿分別放置于25℃、30℃、35℃的恒溫培養(yǎng)箱中培養(yǎng),間隔一定時(shí)間取藻液進(jìn)行加壓混凝沉淀濃縮實(shí)驗(yàn),取上清液測(cè)定濁度、TN、TP、CODcr以及殘余葉綠素和藻毒素量等水質(zhì)指標(biāo),最終得出在不同腐爛程度下的最佳加藥量。通過靜態(tài)實(shí)驗(yàn)發(fā)現(xiàn),在處理新鮮藻漿(腐爛度在30%以下)時(shí)隨著投藥量的增加,新鮮藻漿經(jīng)過混凝沉淀后各污染物釋放量以及殘余葉綠素和藻毒素量是逐步降低的,最終確定當(dāng)PAC投加量與干藻質(zhì)量比為1/15以及PAM投加量與干藻質(zhì)量比為1/1000時(shí)為最佳投加量;當(dāng)藍(lán)藻漿開始腐爛(腐爛度在30%到60%)時(shí),最終確定將PAC投加量與干藻質(zhì)量比調(diào)整到1/5以及將PAM投加量與干藻質(zhì)量比調(diào)整為1/800能明顯提高出水水質(zhì);在處理陳腐藻漿(腐爛度在60%以上)時(shí),最終確定當(dāng)PAC投加量與干藻質(zhì)量比為1/1.6以及PAM投加量與干藻質(zhì)量比為1/667時(shí)為最佳投加量。(3)通過動(dòng)態(tài)實(shí)驗(yàn)研究了結(jié)團(tuán)絮凝沉淀濃縮新鮮藍(lán)藻和陳腐藍(lán)藻漿的工藝方法和效果,先采用雙罐并聯(lián)加壓裝置對(duì)藻漿進(jìn)行加壓后接結(jié)團(tuán)絮凝沉淀池,待裝置穩(wěn)定運(yùn)行一段時(shí)間后取出水水樣測(cè)定濁度、葉綠素a、TN、TP、高錳酸鹽指數(shù)以及底泥的含水率。通過動(dòng)態(tài)實(shí)驗(yàn)發(fā)現(xiàn),在處理新鮮藻漿時(shí),選定PAC最佳投加量為干藻質(zhì)量的1/20以及PAM的最佳投加量為干藻質(zhì)量的1/1500處理效果最佳。在最佳投藥量下繼續(xù)實(shí)驗(yàn),發(fā)現(xiàn)藻水分離動(dòng)態(tài)實(shí)驗(yàn)各項(xiàng)指標(biāo)是優(yōu)于靜態(tài)實(shí)驗(yàn)的,出水濁度普遍小于6NTU、葉綠素a濃度小于7mg·m-3,藻泥的含水率小于97%,但是要控制原藻漿的含水率在99%以上,并且在99.4%時(shí)的處理效果最佳;在處理陳腐藻漿時(shí),選定PAC最佳投加量為干藻質(zhì)量的1/1.5以及PAM的最佳投加量為干藻質(zhì)量的1/300處理效果最。繼續(xù)研究我們發(fā)現(xiàn)需要將上升流速控制在2m·h-1的范圍內(nèi)以達(dá)到最佳的出水要求,在最佳投藥量下,為了達(dá)到最佳的處理效果,需要控制原藻漿的含水率在99.2%以上,并且在99.4%時(shí)的處理效果達(dá)到最佳。
[Abstract]:In order to improve the blue-green algae slurry concentrating efficiency, reduce energy consumption, the external pressure crushed cyanobacteria balloon, the cyanobacteria lose buoyancy force to precipitation separation. This paper focuses on the research and the decay characteristics and cyanobacteria cyanobacteria pressed pellet flocculation precipitation concentration effect, and on the basis of the pressure pressure pellet flocculation sedimentation process dynamics of cyanobacteria the test, so as to obtain a safe, efficient and economical algae water separation process. (1) studied the decomposition process under different temperature of cyanobacteria, the blue-green algae slurry were placed in 25 degrees, 30 degrees, 35 degrees thermostatic culture box, a certain time interval to observe the cyanobacteria traits, sampling and determination of residual cyanobacteria chlorophyll was used to characterize the extent of decay of cyanobacteria. Determination of cyanobacteria filtrate in TOC, TN, TP and other water quality indicators, characterization of cyanobacteria algal cells after decay, broken the amount of pollutants released into the water, indirect Reflect the decay degree. When cyanobacteria culture temperature was 25, and no obvious changes of cyanobacterial decay degree and pollutant emissions at the start of training after 108h, while the decay degree and pollutants in the subsequent 96h release began to increase gradually, the whole process of decay is slow and requires 7.5d to fully decay when the culture temperature; is 30 degrees centigrade, and pollutant emissions of putrefactive cyanobacteria in began to develop 12h after a larger variation, then the putrefactive cyanobacteria degree and pollutant emissions to increase decrease after the change in 36h, the whole process of decay faster 3.5D only need to completely decay; when the culture temperature is 35 degrees centigrade, algae decay degree and pollutant emissions at the start of training 24h after quickly increased until a stable, the whole process of fast decay only 1D completely decomposed. (2) through the static experiments of different decay degree of blue-green algae slurry coagulation The performance of blue-green algae slurry were placed in 25 degrees, 30 degrees, 35 degrees thermostatic culture box, a certain time interval from algae liquid pressure coagulation sedimentation experiment concentrated supernatant, determination of turbidity, TN, TP, CODcr and residual chlorophyll and microcystin amount and other water quality indicators in the different degree of decay under the optimum dosage. Through static experiments, in the processing of fresh algae slurry (decay degree below 30%) with the increase of drug dosage, fresh algae slurry after coagulation and sedimentation of various pollutants emissions and residual chlorophyll and microcystins amount is gradually reduced, and ultimately determine when the dosage of PAC and dry algae the mass ratio of 1/15 and PAM dosage and the dry algal mass ratio 1/1000 was the optimal dosage; when the algae slurry begins to rot (decay in 30% to 60%), and ultimately determine the dosage of PAC and dry algae mass ratio adjusted to 1/5 and the dosage of PAM and dry algae The mass ratio is adjusted to 1/800 can significantly improve the water quality; in the treatment of stale algae slurry (decay degree above 60%), and ultimately determine when the PAC dosage and the dry algal mass ratio of 1/1.6 and PAM dosage and the dry algal mass ratio 1/667 was the optimal dosage. (3) method and process the effect of dynamic experimental studies of pellet flocculation precipitation concentrated fresh cyanobacteria and stale cyanobacteria pulp, using double tank parallel pressurizing device for pressurizing the algae slurry after pellet flocculation sedimentation, turbidity determination, for the stable operation of the device after a period of time out of the water sample of chlorophyll a, TN, TP, permanganate index and sediment the rate of water content. Through dynamic experiments, in the processing of fresh algae slurry, selected the best dosage of PAC was 1/20 and the quality of the dried algae PAM dosage is the quality of the dried algae 1/1500 best. Continue the experiment at the optimum dosage, found water algae From the dynamic experiment indexes is better than the static experiment, the effluent turbidity is generally less than 6NTU, the chlorophyll a concentration less than 7Mg / M-3, water algae mud rate less than 97%, but to control the raw water algae slurry at a rate above 99%, and the best treatment effect in 99.4%; in the treatment of stale algae slurry, selected 1/300 the treatment effect is the best dosage of dried algae quality the best dosage of PAC was 1/1.5 and the quality of the dried algae PAM. We found that the need to continue to study the rise velocity control in the range of 2m - H-1 in order to achieve the best water requirements in the best dosage, in order to achieve the best treatment effect, need control of raw water algae slurry at a rate above 99.2%, and the treatment effect in 99.4% to achieve the best.

【學(xué)位授予單位】：揚(yáng)州大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：X524

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