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        【浸没式超滤膜应用】

         

            浸没式膜系统在大、中型自来水水厂的特别优势,决定了她将是大型低压膜法系统之前进势头。浸没式膜组件包括固定在垂直或水平框架上的中空纤维膜、设在框架顶部和底部的透过液集水管。每个集水管包含有一层密封膜丝的专用树脂,有效膜的内腔与管道相连以募集产品水,因而浸没式膜组件只有产水端一个连接点。几个或几十个膜组件通过两个硬直角管将她集水管相衔接,同时将它们位置固定,形成一个膜箱。竞争性反冲洗和温情温和的氛围擦洗可以减少膜面的浓差极化,这种运行方式对应于低的膜污染速率。多少个膜箱并联浸没在膜池中结成一个膜列,多少个膜列并联组成不同处理范畴之膜处理系统。

           与民俗的压力式膜过滤不同,浸没式膜是在较低的负压状态下运作使用,运用虹吸或泵抽吸方式将水由外向内展开负压抽滤,贯彻低跨膜压差(TMP)、相当膜通量的安居乐业运作的直拍式全量过滤,这使得他完整能耗成本低于压力式膜过滤,一般说来在0.03-0.06kW•h/m3之间。这第一表现为:

        ① 膜压差沿中空纤维膜长度方向均匀分布,在膜的进水一侧没有压降损失;

        ② 抽吸模式的运作对膜压差和膜通量施加了一番明确的限制,使她保持在过滤曲线之恒压控制区。

         

         

           

                         

                         

                         

                             浸没式膜操作原理

                  

        下系统设计上,浸没式膜可把直接浸入到需要处理的眼中,因此系统之占地面积非常小。这也就送现有处理厂的改造提供了规范,可以将膜安装到现有的澄清池或滤池或其他水池中,故此浸没式膜系统无论对新建还是已建处理厂的提升都特别出色:即同样的占地面积从,出水水量提高2-4倍,同时保证优质的产品水。采取成列之浸没式膜流程中要求很少的泵、成像机和阀门,在进水泵处,采取配水渠将水输送到各个流程池中,调减了资源损失,使水以重力流形式流动。通常的暴动冲洗设备也得以采取,这减少了占地面积,降低了系统之复杂,调减了投资和资费。

         

             

         

         

         

                          浸没式

        在例行运作过程中膜系统生产透过液(产水),原水通过进水管和进水控制阀进入膜池。膜浸没在膜池中的原水中,透过液泵从膜内侧将水负压抽吸过膜壁。每个膜列的全套膜箱产生之透过液通过透过液泵收集到共用之透过液抽吸管后,再到任何膜列共用之透过液母管中,说到底进入从一地之拍卖

           趟水中固体物质积累在膜的外部,会逐渐增多跨膜压差(TMP)值。反洗过程可以去除膜表面的液体物质,因而使TMP恢复到明天一个产水周期中TMP值。大多数反洗是每天进行的,有助于保持TMP且延长清洗周期,降低平均能耗。反洗过程包括将透过液反向透过膜、曝气擦洗膜去除沉积物,防止它们沉积在膜表面,并且将膜池中的液体排到废液池或污水管。在反冲洗时,条件进入了超滤膜箱的底层在超滤膜的外部形成紊流,上升中的气泡擦洗并清洁超滤膜丝的外表面,加强超滤膜的拍卖效率。下一场,重新将进水注入膜池,起来产水。产水还需周期性地停止以对膜进行化学清洗,以去除膜的农田水利污染或是结垢物质。主题性清洗的效率根据处理厂的水质和运转规则而变化。

            顶浸没式膜系统越来越普及,很有必不可少了解该系统之构成和运转,并注意支持系统或配套设施的规划。尽管膜系统设计的要害是与膜有关的平均数,比如膜的品种、小小数、膜元件配置、交通量和总体性等。成功之膜系统之实际挑战是系统运行所需配套设施的规划,合同一体的规划,考虑系统水力条件、全总水处理厂、现场约束条件、专业要求、资产、运作、维修、系统冗余以及膜系统成功运行所需的任何条件。膜系统配套设施包括泵、鼓风机和空压机等,担负日常运行,包括过滤、反洗、清洗和精神性测试等工艺过程。

          

                        

                                 清水厂膜池平面布置

          采取超滤膜处理污水已经越来越普遍,重要是因为有关微生物和浊度的正规越来越严峻。艺术之开拓进取、资产的下落、增长的家顾问和终端用户对超滤膜的熟悉程度将会导致超滤膜在大型污水厂中的应用。同时,基于占地面积、耗资、药耗、配套通用设备与配件数量、系统复杂性及与健康工艺的联网性、膜使用寿命和产品生命周期成本等综合分析,浸没式超滤膜将是大型污水厂低压膜法工艺的极品选择。

                Submerged ultrafiltration membrane application

         Submerged membrane system has unique advantages in large and medium-sized waterworks,decided that it will be the direction of development of large low pressure membrane method system.Immersion type membrane assembly comprises a hollow fiber membrane, fixed in the vertical or horizontal frame is arranged in the frame at the top and bottom of the water collecting pipe through the liquid. Each water collecting pipe comprises a layer of sealing membrane wires of special resin,the membrane cavity is connected with a pipe to collect the product water, thus submerged membrane components only water production end a connection point. Several or dozens ofmembrane components through two hard rectangular tubes connect the water collecting pipe, at the same time they fixed position, forming a film box. Periodic backwashing and slow gentle airscrubbing can reduce membrane surface concentration polarization, the operation modecorresponding to the low rate of membrane fouling. A plurality of membrane tank parallel immersionconsists of a membrane column in the membrane tank, a plurality of film column parallel processingsystem composed of different processing scale film.

            Different from the traditional pressure type membrane filtration, submerged membrane is used to run in the state of negative pressure is lower, the use of siphon or the pump suction negative pressure filtration mode of water from the outside to the inside, realize low transmembrane pressure(TMP), DC steady operation of moderate membrane flux of total content filtering, which makes thethe overall energy consumption cost is lower than the pressure type membrane filtration, generally between 0.03-0.06kW - h/m3,this is mainly as follows.

         

              The membrane pressure evenly distributed along the length direction of the hollow fiber membrane no pressure losses in the inlet side of the membrane;

         

             The pumping mode operation of the transmembrane pressure and the membrane flux exerted adefinite limit, make it keep control region in constant pressure filtration curve.

            

              From the system design, submerged membrane can be directly immersed into the need to deal withthe water, and thus the system covers an area of very small. This also to the transformation of the existing treatment plant to provide the conditions, can be installed into existing clarifier membraneor filter or other pool, so submerged membrane system regardless of the newly built or builtprocessing plant upgrades are very ideal: that is the same area, water content increased 2-4 times,at the same time guarantee the high quality product water. The use of a few pump, fan and valve need submerged membrane process of columns, the water f, eeding pump, using a distribution channel water to, ,  each proc, ess in the pool, reducing the head loss, so that the water flow by gravity flow form. Ordinary backwash device can also be used, which reduces the occupied area, reduces the complexity of the system, reducing the investment and cost.

         

             During normal operation of production through the liquid membrane system (produced water), the raw water through a water inlet pipe and a water inlet control valve into the membrane tank.Membrane immersed in the membrane tank in the raw water through the liquid pump from the filmon the inner side of the negative pressure suction membrane water wall. All the membrane boxeach film column generated from liquid passes through the liquid pump to collect common through the liquid is pumped Straw, to all the membrane column shared through the liquid duct, and finally into the next process.

                The water surface of solid matter accumulation in the film, will gradually increase thetransmembrane pressure (TMP) value. Solid material backwashing process can remove themembrane surface, so that the TMP is restored to its former a water production cycle TMP value.The majority of the backwashing is done every day, help keep TMP and prolong the cleaning period, reduce the average energy consumption. Backwashing process including through liquidmembrane, reverse through aeration scrub film removal of sediment, prevent their deposition on the membrane pool and discharging the liquid in the waste liquid pool or sewage pipe. During backwashing, the air enters the ultrafiltration membrane on the surface of the bottom of the box form turbulent flow ultrafiltration membrane, the outer surface of the bubble in thescrub and clean up the ultrafiltration membrane filaments, improve the processing efficiency of ultrafiltration membrane. Then, to the inlet injection membrane pool, began to produce water. Water production also need to periodically stop for chemical cleaning of the membrane, organic pollutionremoval by membrane fouling substances or. Restorative cleaning frequency according to the water quality and operating conditions of treatment plant and change.

                When submerged membrane system is becoming more and more popular, it is necessary tounderstand the composition and operation of the system, and pay attention to the design of support system or equipment. Although the film system design is the key parameters associated with membranes, such as films, fibers, the number of species of membrane element configuration, fluxand performance. The real challenge of membrane system successfully is to design equipmentrequired for the running of the system, designed to ensure the integration, considering hydrauliccondition, system of the whole water treatment plant, site constraints, standardize the other conditions required, cost, operation, repair, the required system redundancy and film the successful operation of the system. Membrane system equipment comprises a pump, blower and compressor,responsible for the day-to-day operation, including filtration, backwashing, cleaning and complete testing process.

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               The water plant membrane pool layout

             The use of ultrafiltration membrane for treatment of drinking water has become more and more popular, mainly because of microbe and <,/SPAN>turbidity standards more stringent. The progress of technology, reduce cost, increase the expert consultants and the end-user of the ultrafiltration membrane ultrafiltration membrane familiarity will result in large water plant application. At the same time, based on the area, energy consumption, drug consumption, supporting universal equipment and parts number, system complexity and with the conventional process of the convergence, the service life of the membrane and product life cycle cost analysis, the immersed ultrafiltration membrane is the best choice for large water plant in low pressure membrane process.

         

         

         
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