slow sand filters are as a proper technology for pre-treatment of raw water, with a fine and medium trubidity in small communities in developing countries. thus, with a minimum operation cost and minimum need for expest bodies have the maximum efficiency. the purpose of this research is carried out to evaluate the efficiency of two processes of horizontal flow roughing filter and vertical flow ...

i chlor. injected in the adjoining area of the bitten part. 1 a.m. Severe pain in the arm. Rubber cord and handkerchief removed. 1-30 a.m. Pulse 64. Resp. 24. Temp. 98. Calm and quiet. No sleep. Spt. ammon. arom. half drachm. 2 a.m. Pulse 64. Resp. 24. 2-30 a.m. Shivering. Hot coffee to drink. 3 a.m. Pulse 64. Resp. 24. Drowsy. 3-30 a.m. Vomited. Pulse 60. Resp. 26. Temp. 98. 3-45 a.m. Getting ...

an air filter is a significant element of any mechanical ventilation system. however, the importance and performance evaluation of air filters have not been well publicized and related scientific reports are scarce. in this study, a transportable, off-line, air filter-testing unit (the unit) was designed and utilized to simulate the filter housing of a mechanical ventilation system. the unit wa...

  Nitrifying trickling filters (NTFs) represent an effective technology for water resource recovery facilities (WRRFs) to achieve compliance with ammonia-N permits. However, while the potential benefits of NTFs are many, the design methods and associated parameter databases are underdeveloped. Research herein focused on analysis of pilot-scale NTF data to develop enhanced design guidance. rn(ma...

the notion of absorbent ordered filters in implicative semigroupsis introduced, and its fuzzification is considered. relations among (fuzzy) orderedfilters, (fuzzy) absorbent ordered filters, and (fuzzy) positive implicativeordered filters are stated. the extensionproperty for (fuzzy) absorbent orderedfilters is established. conditions for (fuzzy) ordered filters to be (fuzzy)absorbent ordered ...

This study aimed to undertake an environmental life cycle assessment (LCA) of a sewage treatment plant (STP) equipped with low-rate trickling filters (TFs) as post-treatment upflow anaerobic sludge blanket (UASB). The STP is located in South Brazil and uses landfill agriculture sludge-disposal alternatives. evaluation was performed using the LCA technique SimaPro® 9 software. results revealed t...