Reverse Osmosis for Wastewater Recycling Essay Example for Free

Reverse Osmosis for Wastewater Recycling Essay Reusing treated wastewater for beneficial purposes, such as agricultural and landscape irrigation, industrial processes, toilet flushing, or groundwater basin replenishment, is growing in response to environmental and economic concerns. One of the key factors involved in recycling wastewater treatment plant (WWTP) effluent for another use is the need to reduce total dissolved solids (TDS). This is often done by using a reverse osmosis (RO) system, which relies on pressure differential to force a solution (in this case, water) through a membrane that retains the solute on one side and allows the pure solvent to pass to the other side. While extremely effective on biologically treated wastewater, RO systems need to be coupled with an effective pretreatment system to avoid common issues that can result in system failure, including plugging, fouling, and scaling. One of the most effective pretreatment options for wastewater applications is membrane bioreactor (MBR) technology, in which a membrane process like ultrafiltration (UF) or microfiltration is combined with a suspended growth bioreactor. MBR provides high quality feed water to the RO, minimizes footprint and the cost of civil works, and reduces treatment plant downtime, thereby reducing operating costs. Koch Membrane Systems’ PURON ® submerged MBR technology has successfully been used as the pretreatment option for challenging industrial and municipal water reuse RO systems, and can help make water recycling technologies more cost-effective. Reverse Osmosis Systems Present Challenges for Water Reuse Pretreatment methods are critical when designing RO systems. For example, RO membranes used for most water reuse applications contain a brine spacer, typically made of low density polyethylene mesh netting. If there is a high level of suspended solids in the feed water, this brine spacer can become plugged. Another issue is the high levels of organics contained in many biologically treated wastewaters, which are rejected by the RO membrane and progressively concentrated as the water flows across the membranes. This concentration of organics can foul the membrane, especially towards the RO system outlet. Biofouling can also occur, because the organics in wastewater make an excellent food source for microorganisms. Also, some treated wastewaters contain high levels of bacteria, so biogrowth may occur quickly even if RO feed water is disinfected. Finally, calcium phosphate scaling can cause problems with RO systems operating on some wastewaters. The scaling can be mitigated by operating at lower water recovery, using acid or other antiscalant to minimize scaling, or modifying the operating conditions of the WWTP to reduce the amount of phosphate in the RO feed. These plugging, fouling, and scaling issues mean that the RO system needs to be operated at higher pressures, leading to increased power consumption, increased chemical costs for cleaning, and a shorter membrane life. How can these challenges be minimized and overall water reuse system lifecycle costs reduced? Effective pretreatment of the feedwater before it flows through the RO system is the answer, provided that the pretreatment steps are chosen carefully to ensure that the RO system can work as intended. Reverse Osmosis Pretreatment Options There are many different pretreatment options, and the best for a particular process depends on power, chemical, labor and land costs, wastewater source, and the existing wastewater treatment system. Conventional Pretreatment The conventional effluent pretreatment scheme might be primary treatment, biological treatment and, the most crucial part of the process, solids-liquid separation using secondary clarification. The conventional sedimentation process often doesn’t remove enough bacteria and suspended solids, so sand filtration may be added to improve the solids-liquid separation and provide higher quality water to feed the RO system. Using ferric chloride along with the sand filtration may enhance solids and organics removal. However, upsets in the secondary clarifier can lead to effluent with higher levels of TSS and BOD, causing plugging of the brine spacer with suspended solids and organic fouling. Also, power consumption for RO systems with this type of pretreatment tends to be high, and membrane life is often quite short. Lime-softening has been somewhat more successful in protecting the RO membranes, but this increases operating costs and does not totally prevent fouling of RO membranes. Ultrafiltration Improves Suspended Solids Removal As RO Pretreatment Many of today’s water reuse systems use an ultrafiltration (UF) pretreatment step to emove suspended solids. These systems typically use hollow fiber UF membranes, which do an excellent job of providing water with low suspended solids to feed the RO system. However, the UF system is an extra treatment step, requiring additional footprint, and adding to operating costs. The UF system may also be susceptible to upsets from a conventional WWTP, which can further increase its operating costs. Membrane Bioreactor As RO Pretreatment With an MBR, the UF membranes are submerged in the activated sludge to combine the biological step and the solid-liquid separation into a single process. The membrane acts as a barrier, which improves the effluent quality. The MBR eliminates the secondary clarifier and does not rely on gravity for liquid-solids separation and so allows the activated sludge to operate with a higher mixed liquor suspended solids (MLSS) concentration. The increased MLSS concentration reduces bioreactor tank volume, saving footprint and capital construction costs. Overall, the MBR process reduces footprint significantly compared to the combination of conventional activated sludge followed by sand filtration or ultrafiltration. The footprint savings due to the wastewater treatment plant alone can be as much as 50 percent, along with additional footprint savings from eliminating other filtration steps. Using MBR technology also simplifies the overall treatment train, minimizing the number of unit operations. Benefits Of Koch Membrane Systems’ PURON MBR Technology Koch Membrane Systems’ PURON submerged hollow fiber UF module offers robust, cost effective solutions for RO pretreatment. The patented membrane module contains hollow fibers, the lower ends of which are fixed in a header. The upper ends are individually sealed and are free to move laterally, as shown in Figure 1. The PURON module is submerged in the mixed liquor. All solids and particulates remain on the outside of the fibers while permeate flows in an outside-in pattern by means of a vacuum that evacuates permeate through the inside of the hollow fiber. | The free moving fibers, combined with central air scour aeration, ensure stable filtration during plant operation, long membrane life, and lower operating costs due to reduced need for energy, cleaning and maintenance. PURON MBR has been used successfully as the pretreatment step for a number of challenging industrial wastewater systems. For example, a Belgian firm that manufactures chemicals for film processing and printing uses large amounts of fresh water for cleaning and production. The firm began reusing its wastewater to reduce its fresh water costs, and selected an RO system to produce water with the low salt and nitrogen content required for its process. The firm installed a PURON submerged hollow fiber MBR as the pretreatment step prior to the RO, and the system has been operating successfully since 2005. Another example is an Australian malt-producing company that sought to reduce its use of fresh water by recycling its wastewater. PURON MBR technology was selected as the pretreatment step for the RO system, since it provided the best quality water to feed the RO while minimizing overall operating costs. The MegaMagnum ® RO system recovers the MBR effluent as product water for reuse. The system has been running since 2006. In fact, the RO permeate quality is equal to or better than the local potable water supply. Space Cost Considerations Treatment operation footprint is a primary consideration in developing the best treatment system. Since the PURON MBR system reduces the volume of the bioreactor tanks and eliminates the secondary clarifier, the footprint for an MBR process is much smaller than tertiary filtration steps with sand filtration or UF. If space is limited, MBR may be the only pretreatment choice that fits in the available space. Other considerations include costs of land, civil works, equipment, power, chemicals and labor, and the payback period used. High land and civil costs tend to favor MBR use. For large municipal treatment facilities requiring RO as a final treatment step, an MBR should compare favorably to conventional wastewater treatment as a pretreatment step prior to RO. In a 20-year analysis the municipality should realize savings in RO membrane replacement and power as a result of the MBR pretreatment step. For an industrial company looking at a short payback, the preference for conventional or MBR technology will depend on the relative cost of civil works and land versus the equipment cost. Conclusions Using RO systems to reclaim and recycle wastewater effluent is growing rapidly, and Koch Membrane System’s PURON MBR technology is now being considered as the pretreatment option for an increasing number of industrial and municipal reuse applications. The PURON submerged membrane modules provide high quality feed water to the RO, minimize footprint and the cost of civil works, and reduce the susceptibility of the RO treatment train to upsets. PURON is a trademark of Koch Membrane Systems GmbH and is registered in Austria, Benelux, Canada, China, France, Germany, Italy, Oman, Saudi Arabia, Spain, Taiwan and the United Kingdom. MegaMagnum is a registered trademark of Koch Membrane Systems, Inc. in the United States and other countries. Wastewater Recycling for the Stone Fabrication Industry As a stone fabricator you’re looking for a wastewater treatment system that keeps you in compliance, but wouldn’t it be nice to save some money too? That’s where our wastewater recycling and treatment systems come in. These zero discharge, closed loop systems collect the water you use for polishing, cutting, and other processes; cleans it thoroughly, and recycles it so you can use it again. Your wastewater is never discharged into the public system during this process, so you have no chance of being out of compliance. Between the money you’ll save on non-compliance fees and the reduced cost of your water bill, the return on your investment will be substantial. And because we use the most durable, well-designed components on the market in each wastewater recycling system, you can be sure this system will run efficiently for as long as you need it to. We even design and manufacture some of those components in house, including: * Filter presses * Clarifier systems * Chlorine dioxide generators * Control panels * More The solid, smart construction of our zero discharge wastewater recycling systems results in a wide variety of beneficial features, including automation options, expandable filter presses that can accommodate your business as it grows, the ability to accommodate flow rates for 10 GPM – 200 GPM, the ability to filter solids water down to below 1 micron, and more.

Free Othello Essays: The Characters of Othello :: GCSE English Literature Coursework

The Characters of Othello  Ã‚   Shakespeare's Othello is a novel that depicts on the intense relationship between Othello, Cassio, and Iago. One charter may see the other as a dear friend and a comrade, but the second one may see the first as an inferior person that he/she is envious of due to something they have. Othello is a tragedy of trust, if you learn to trust then you live in happiness, but the power of distrust is enough to make a man attempt evil and corrupt actions. During the course of the book some of the characters relations become strong, but then at the last possible moment most of those relations revert and a few increase. It is a difficult thing to explain, but I'll break it down for you. Each character had his own relation towards another, Othello had a strong friendship towards Iago, as if he were his brother. Othello sees Cassio as a fine young soldier, but as the story goes on he begins to despise Cassio because he was fed false information about Cassio that upset the war hero greatly. Iago hat es Othello, because he gave what he thought was an underqualified soldier a promotion, so he is out for revenge. Iago is also jealous of Cassio for the reason just given, he thinks he deserves the promotion and is very envious that Cassio beat him to it. Why did these people's relation change? What role does trust play in the entire play? When do we know when to trust and when not to trust? These are all questions that wonder in your heads because in some cases it is bad to trust, but in others trust is what keeps relationships and friendships alive, don't be confused its just a matter of knowing when to trust and when not to trust. Othello and Iago one of the most fake friendships ever to be put down on paper. Othello was most definitely a true to Iago, he trusted Iago on the battle field and in his social, now that is the trust of a real friend. Othello saw Iago as his most trusted soldier, consultant, and friend. Othello was the type of person that always thought people would think low of him cause of the color of his skin. He fell in love with a woman whose family dislikes him due to the color of thou skin.

Radical

INTRODUCTION Jawaharlal Nehru was born on 14 November 1889. He died on 27 May 1964. He was an Indian statesman who was the first (and to date the longest-serving) prime minister of India, from 1947 until 1964. One of the leading figures in the Indian independence movement, Nehru was elected by the Congress Party to assume office as independent India's first Prime Minister, and re-elected when the Congress Party won India's first general election in 1952. As one of the founders of the Non-aligned Movement, he was also an important figure in the international politics of the post-war era.He is frequently referred to as Pandit Nehru (â€Å"pandit† being a Sanskrit and Hindi honorific meaning â€Å"scholar† or â€Å"teacher†) and, specifically in India, as Panditji (with â€Å"-ji† being a honorific suffix). The son of a wealthy Indian barrister and politician, Motilal Nehru, Nehru became a leader of the left wing of the Indian National Congress when still fai rly young. Rising to become Congress President, under the mentorship of Mahatma Gandhi, Nehru was a charismatic and radical leader, advocating complete independence from the British Empire.In the long struggle for Indian independence, in which he was a key player, Nehru was eventually recognized as Gandhi's political heir. Throughout his life, Nehru was also an advocate for Fabian socialism and the public sector as the means by which long-standing challenges of economic development could be addressed by poorer nations. PERSONAL LIFE AND EDUCATION Jawaharlal Nehru was born to Motilal Nehru (1861–1931) and Swaroop Rani (1863–1954) in a Kashmiri Pandit family. Nehru was educated in India and Britain. In England, he attended the independent boy's school, Harrow and Trinity College, Cambridge.During his time in Britain, Nehru was also known as Joe Nehru. On 8 February, 1916, Nehru married seventeen year old Kamala Kaul. In the first year of the marriage, Kamala gave birth t o their only child, Indira Priyadarshini. Life and career Nehru raised the flag of independent India in New Delhi on 15 August 1947, the day India gained Independence. Nehru's appreciation of the virtues of parliamentary democracy, secularism and liberalism, coupled with his concerns for the poor and underprivileged, are recognized to have guided him in formulating socialist policies that influence India to this day.They also reflect the socialist origins of his worldview. He is sometimes referred to as the â€Å"Architect of Modern India†. His daughter, Indira Gandhi, and grandson, Rajiv Gandhi, also served as Prime Ministers of India. Successor to gandhi On 15 January 1941 Gandhiji said, â€Å"Some say Pandit Nehru and I were estranged. It will require much more than difference of opinion to estrange us. We had differences from the time we became co-workers and yet I have said for some years and say so now that not Rajaji but Jawaharlal will be my successor. † Finaly earsNehru had led the Congress to a major victory in the 1957 elections, but his government was facing rising problems and criticism. Disillusioned by intra-party corruption and bickering, Nehru contemplated resigning but continued to serve. The election of his daughter Indira as Congress President in 1959 aroused criticism for alleged nepotism, although actually Nehru had disapproved of her election, partly because he considered it smacked of â€Å"dynasties†; he said, indeed it was â€Å"wholly undemocratic and an undesirable thing†, and refused her a position in his cabinet.Indira herself was at loggerheads with her father over policy; most notably, she used his oft-stated personal deference to the Congress Working Committee to push through the dismissal of the Communist Party of India government in the state of Kerala, over his own objections. Nehru began to be frequently embarrassed by her ruthlessness and disregard for parliamentary tradition, and was â€Å"hurt † by what he saw as an assertiveness with no purpose other than to stake out an identity independent of her father.Although the Pancha Sila (Five Principles of Peaceful Coexistence) was the basis of the 1954 Sino-Indian treaty over Tibet, in later years, Nehru's foreign policy suffered through increasing Chinese antagonism over border disputes and Nehru's decision to grant asylum to the Dalai Lama. After years of failed negotiations, Nehru authorized the Indian Army to annex Goa from Portugal in 1961. While increasing his popularity, Nehru received criticism for opting for military action. In the 1962 elections, Nehru led the Congress to victory yet with a diminished majority.Opposition parties ranging from the right-wing Bharatiya Jana Sangh and Swatantra Party, socialists and the Communist Party of India performed well. In a matter of months, the border disputes with China turned into open conflict. Nehru assumed that as former victims of imperialism (India being a colony it self) they shared a sense of solidarity, as expressed in the phrase â€Å"Hindi-Chini bhai bhai† (Indians and Chinese are brothers). He was dedicated to the ideals of brotherhood and solidarity among developing nations.Nehru, credulously, did not believe that one fellow Socialist country would attack another; and in any event, he felt secure behind the impregnable wall of ice that is the Himalayas. Both proved to be severe miscalculations of China's intentions and military capabilities. Following reports of his intention to confront Chinese occupation of the disputed areas – summarised in a memorable statement that he had asked the Army to â€Å"throw them (Chinese) out† – China launched a pre-emptive attack.In a matter of days, a Chinese invasion of northeastern India exposed the weaknesses of India's military as Chinese forces came as far as Assam. Widely criticized for his government's insufficient attention to defence, Nehru was forced to sack the def ence minister Krishna Menon and seek U. S. military aid. Nehru's health began declining steadily, and he was forced to spend months recuperating in Kashmir through 1963. Some historians attribute this dramatic decline to his surprise and chagrin over the invasion of India by the Chinese, which he perceived as a betrayal of trust.Upon his return from Kashmir in May 1964, Nehru suffered a stroke and later a heart attack. He died in the early hours of 27 May 1964. Nehru was cremated in accordance with Hindu rites at the Shantivana on the banks of the Yamuna River, witnessed by hundreds of thousands of mourners who had flocked into the streets of Delhi and the cremation grounds. LEGACY As India's first Prime minister and external affairs minister, Jawaharlal Nehru played a major role in shaping modern India's government and political culture along with sound foreign policy.He is praised for creating a system providing universal primary education, reaching children in the farthest corner s of rural India. Nehru's education policy is also credited for the development of world-class educational institutions such as the All India Institute of Medical Sciences, Indian Institutes of Technology, and the Indian Institutes of Management. In addition, Nehru's stance as an unfailing nationalist led him to also implement policies which stressed commonality among Indians while still appreciating regional diversities.This proved particularly important as post-Independence differences surfaced since British withdrawal from the subcontinent prompted regional leaders to no longer relate to one another as allies against a common adversary. While differences of culture and, especially, language threatened the unity of the new nation, Nehru established programs such as the National Book Trust and the National Literary Academy which promoted the translation of regional literatures between languages and also organized the transfer of materials between regions. In pursuit of a single, un ified India, Nehru warned, â€Å"Integrate or

A Worldview Is The Foundation On The World - 1023 Words

A worldview is the foundation on which you build your understanding of the world. The worldview of each individual person represents their interpretation of the world, what is true, and what is ethical. These beliefs affect everyone in their lifestyle choices and their aptitude of society. When building a foundation for your worldview, the book of Genesis provides ample facts regarding the natural world, human identity, human relationships, and civilization. The first chapter of Genesis teaches us that the world, everything surrounding it, and everything inhabiting it, is well-made and good in God’s eyes. Genesis 1:1 states that â€Å"In the beginning, God created the heavens and the earth†. Throughout the rest of the chapter, God continues adding to and forming the entire universe. He carefully planned creation in a logical and orderly fashion. For example, God created light before plants so that the plants would have a source to photosynthesize and sustain life. God also put significant thought into creating the expanse, or space. Through scientific research, scientists have concluded that there are over one billion galaxies in the universe. Additionally, some scientists say that the number of stars in the galaxy are equal to the number of grains of sand on all of the beaches that cover the earth. Besides astronomy, biology also teaches us that all living organisms are composed entirely of microscopic cells. Each cell has a function and each cell contains different partsShow MoreRelatedDifferent Philosophies That People Believe1634 Words   |  7 PagesThere are several different worldviews that people believe in. Those might ask what exactly is a worldview? Here is the definition: â€Å"A worldview is the framework of basic beliefs that we hold, whether we realize it or not, that shapes our view of and for the world. Everyone has a worldview. 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