導(dǎo)  讀     在污水處理過(guò)程中，總會(huì)遇到各種各樣的污水問(wèn)題，比如：COD、氨氮、TP等指標(biāo)不達(dá)標(biāo)，污泥膨脹、浮泥、活性微生物死亡等，當(dāng)我們遇上這些問(wèn)題的時(shí)候，不妨拿出這篇文章進(jìn)行對(duì)照解決問(wèn)題。     一、出水水質(zhì)   1、有機(jī)物   影響有機(jī)物處理效果的因素主要有：   (1)營(yíng)養(yǎng)物 一般污水中的氮磷等營(yíng)養(yǎng)元素都能夠滿足微生物需要，且過(guò)剩很多。但工業(yè)廢水所占比例較大時(shí)，應(yīng)注意核算碳、氮、磷的比例是否滿足100:5:1。如果污水中缺氮，通?？赏都愉@鹽。如果污水中缺磷，通常可投加磷酸或磷酸鹽。   (2)pH 污水的pH值是呈中性，一般為6.5～7.5。pH值的微小降低可能是由于污水輸送管道中的厭氧發(fā)酵。雨季時(shí)較大的pH降低往往是城市酸雨造成的，這種情況在合流制系統(tǒng)中尤為突出。pH的突然大幅度變化，不論是升高還是降低，通常都是由工業(yè)廢水的大量排入造成的。調(diào)節(jié)污水pH值，通常是投加氫氧化鈉或硫酸，但這將大大增加污水處理成本。   (3)油脂 當(dāng)污水中油類物質(zhì)含量較高時(shí)，會(huì)使曝氣設(shè)備的曝...

1、為什么需要預(yù)過(guò)濾器？ 除病毒過(guò)濾在生物制藥的過(guò)程中是一個(gè)關(guān)鍵步驟。然而即使是層析純化后的樣品，蛋白聚體和雜質(zhì)也會(huì)限制除病毒過(guò)濾器的載量，導(dǎo)致過(guò)濾膜面積增加。 除病毒濾器堵塞主要是基于以下原因： 除病毒膜孔需要透過(guò)蛋白攔截病毒，對(duì)膜孔徑要求較高。 細(xì)小病毒直徑約為18-24nm，單抗分子約為8-12nm。聚體將導(dǎo)致膜孔堵塞。 隨著蛋白濃度提高，蛋白單體產(chǎn)生聚體的幾率變大，增加了堵塞除病毒濾器的風(fēng)險(xiǎn)。 蛋白不穩(wěn)定導(dǎo)致結(jié)構(gòu)改變或碎片，以及其他未分離雜質(zhì)，也有可能導(dǎo)致堵塞。 對(duì)樣品進(jìn)行預(yù)過(guò)濾處理能夠有效的去除這些堵膜因素，因此許多工藝會(huì)加入預(yù)過(guò)濾器來(lái)提高除病毒過(guò)濾器的載量從而降低工藝成本。通過(guò)研究和大量實(shí)踐表明，增加預(yù)過(guò)濾器后的除病毒濾器的平均載量能比未增加提高2倍以上。 2、如何選擇預(yù)過(guò)濾器 預(yù)濾器的選擇需要根據(jù)樣品特性和工藝需求來(lái)決定。一般對(duì)于去除單抗工藝中的聚體來(lái)說(shuō)，吸附比基于分子大小的尺寸排阻的預(yù)過(guò)濾方式更有效。 默克提供了表面改性膜和吸附型深層濾器這兩種預(yù)過(guò)濾器，針對(duì)于不同的需求，達(dá)成穩(wěn)健的工藝目的。 Vire...

Recently, local cases have been confirmed in many places. As of 24:00 on August 3, 2021, 31 provinces (autonomous regions, municipalities directly under the Central Government) and the Xinjiang Production and Construction Corps reported 71 new local confirmed cases and 15 new asymptomatic infections.The General Office of the National Health Commission released the Technical Guidelines for the Prevention and Control of Novel Coronavirus Infection (Second Edition). What guiding significance does it have for the current normalized epidemic prevention and control? Lan Guaping, the infection control plus operation team, brought "A look at the current normalized prevention and control of the epidemic from the second edition of prevention and control guidelines."...

Viral filtration is a common step in the production of many biologics, and viral contaminants of different particle sizes can be removed depending on the pore size of the filter. Integrity Testing (IT) is a way to confirm the retention capacity of a filter. Integrity testing before use can confirm whether the filter has been damaged during transportation and whether the filtration system is set up correctly. Post-use testing can confirm the integrity of the membrane cassette to confirm the effectiveness of the virus removal process. This article supplements the Viresolve® Pro Solution User Guide and is designed to minimize the risk of integrity test failure. Describes the key influencing factors of using automated integrity testers, troubleshooting methods and corresponding measures after test failure. The pre-filters Viresolve® Pro Shield and Viresolve® P...

The popularity of paper bags is not the result of environmental protectionFriends, the "plastic restriction order" has been implemented in China for 12 years. Are you surprised? After 12 years of hard work, plastic bags are no longer flying blatantly on the streets.The author believes that everyone has a common understanding: plastic bags pollute the environment, and most people think that using paper bags is to protect the environment. For breakfast, people subconsciously feel that paper bags are more environmentally friendly than plastic bags. So are paper bags really as environmentally friendly as people think? Beautified paper bag Paper bags are considered environmentally friendly because of their reputation for being highly recyclable and easy to decompose. But if we look at the life cycle of paper bags, you will find that it is not that beautiful.Life cycle: the entire ...

簡(jiǎn)介 水處理廠在為消費(fèi)者生產(chǎn)安全飲用水的過(guò)程中，需要監(jiān)測(cè)多種水質(zhì)參數(shù)，包括水中的pH值、總有機(jī)碳TOC、UV 254吸光度。TOC和UV 254吸光度是評(píng)估水中有機(jī)物（OM，Organic Matter）含量和質(zhì)量的重要參數(shù)。   TOC和紫外吸光度都取決于水中的有機(jī)物。正確了解兩者的關(guān)系，就能避免錯(cuò)誤解讀水質(zhì)監(jiān)測(cè)數(shù)據(jù)。本文討論了這兩個(gè)參數(shù)間的關(guān)系，以及它們?cè)谒幚砉に嚭秃弦?guī)性方面的應(yīng)用。文中使用的Sievers® M5310 C分析儀為TOC分析提供了最佳解決方案，實(shí)際樣品數(shù)據(jù)也證明了此款分析儀的實(shí)用性。   技術(shù)比較 有機(jī)物  有機(jī)物是指水中的各種化合物的混合，包括自然物質(zhì)（即植物、動(dòng)物、微生物）降解后產(chǎn)生的天然有機(jī)物（NOM，Natural Organic Matter），以及生活污水帶來(lái)的有機(jī)物1。盡管有機(jī)物本身對(duì)人體健康無(wú)害，但它會(huì)與氯反應(yīng)產(chǎn)生消毒副產(chǎn)物（DBP，Disinfection Byproducts）。消毒副產(chǎn)物對(duì)人體健康有害，因此法規(guī)要求水處理廠在處理水時(shí)控制有機(jī)物的濃度2,3。   TOC和紫外吸光度在有機(jī)物分析中的應(yīng)用 TO...