Waste water treatment Research Paper Example | Topics and Well Written Essays - 1250 words

Waste water treatment - Research Paper Example These techniques, however, are used to treat water. Water contains various colloidal solids such as plankton, decayed plant material, bacteria, clay particles, as well as organic matter. These two processes help to remove these impurities. Coagulation neutralizes the particles and reduces the repelling force. Flocculation agglomerates destabilized atoms to form large particles(Parson and Jefferson, 2006). In the chemical and level theory, flocculation and coagulation involves a three step process that consists of flocculation, flash mixing and coagulation(Akers 1972). For coagulation to take place, flash mixing has to occur. During flash mixing, coagulant chemicals are added to water. This mixture is then mixed violently and quickly distributing the chemicals inside the water. The coagulation-flocculation process destabilizes colloids, removes anions and metals, and removes pathogens as well as inorganic matter. After destabilization, flocs are formed in which particles aggregate come by due to thermal movement of fluid molecules or induction of suspension mix and velocity gradients to be used in sedimentation. Filtration treatments as essential pretreatments are supplemented by coagulation-flocculation processes. These processes accumulate suspended solids and particles into larger bodies to allow easy removal through filtration processes. The removal of particulate matter by these methods tends to supplement the effectiveness of the filtering process. Gravity separation of these suspended solids may also require filtration. In the event of facilitating bonding among various particulates, chemical coagulants such as polymers or iron salts are added to source water(Bratby 2006). The efficiency of this process depends on a number of variables and, therefore, any changes involved may affect other process. Changes may be in form of coagulant feed concentration, final PH, coagulant dosage, type of coagulant used,

Econ exam Essay Example | Topics and Well Written Essays - 250 words

Econ exam - Essay Example Furthermore, HR managers and supervisors are blamed for gender inequality practices, even when the job is suitable for professionals from both genders, mostly because of personal beliefs and the ‘glass ceiling’ effect. Even though such incidences are much more common within second or third world countries, where the position of women is mostly confined to domestic chores, the media in the US is more active on this issue. The economic impacts have been better in the case of US as well as other developed economies, especially after the recent recession, which forced many otherwise homemakers to pursue employment, and thus utilizing their unharnessed talents for economic gains; while creating a healthy competition in the job market. Moreover, even though media has been frenzy about racial and gender discrimination in the workplace (especially within the HR department), such incidences are much more common within developing and under-developed countries. As far as racial differences are concerned, the election of a President with African-American descent is evidence of the fact that the beliefs of the American populace are changing for the better. The economic influence of such events will be advantageous and profitable. Undoubtedly the most obvious and terrible social effect is that some of these couples are treated as outcasts by their own family and community members. Along with this, generation gaps cause even more negative social impacts towards the issue, especially if the cultures and beliefs amongst the couple’s culture differ substantially. Nevertheless, there is a silver lining [†¦] a social significance of interracial marriages, it is the fact that the couple will leave behind a lesson for their next generation, which is to remain indifferent towards racial differences. For something that is considered a taboo in the US, interracial marriages encompass an imperative economic