Reverse osmosis water requirements of making machine with the pretreatment

Reverse osmosis as a new type of purely physical desalting process, due to the structure of reverse osmosis membrane element, material qualitative, desalination mechanism of constraints, such as reverse osmosis of water making machine has higher requirements: between 1 to 45 ℃ temperature conditions; PH must be within the range of 2 to 11. Organic matter content, COD，mg/L) Should be less than 1. 5; Turbidity ( NTU) Should be controlled in 1. Below zero; Sludge density index ( SDI value) < 4. 0; Residual chlorine content & lt; 0. 1mg/L( Actual control in 0) ; The iron content ( mg/L) : dissolved oxygen & gt; 5 mg/L, Fe< 0. 05. Silica content ( mg/L) : strong water SiO2 & lt; 100; LSI：pHb- 小灵通< 0; The Sr and Ba yi formed undissolved salt ions: Ipb< 0. 8Ksp。 After three by adding scale inhibitors can be appropriately increase its value. If if the index one or several is not up to standard, may cause the following effects of reverse osmosis membrane: 1, RO reverse osmosis membrane polluted by metal oxide; 2, colloid pollution; 3, RO reverse osmosis membrane fouling; In 4, suspended matter fouling RO reverse osmosis membrane; 5, organic matter and microbial pollution, which may lead to raise of effluent COD. A bad impact on the reverse osmosis device: reduce the water rate of reverse osmosis pure water system; Warble reverse osmosis pure water system of water quality; Increase ro make chance lines of energy consumption, including raw water, and power consumption; Increase the operation cost of water treatment, including reverse osmosis scale inhibitor, resin regeneration salt, other water treatment agents, etc. Reverse osmosis pretreatment play an irreplaceable role in it. When pretreatment was not well done, reverse osmosis water water quality is not up to standard seriously, and the time is too long, can lead to reverse osmosis membrane element irreversible physical, chemical damage, greatly shorten the service life of reverse osmosis membrane element. Reverse osmosis pretreatment for the purpose of solving the following problems, in order to guarantee the stability of reverse osmosis making machine running and service life. First, to prevent fouling at the membrane surface, Including CaCO3, CaSO4, SrSO4, CaF2, SiO2, iron, aluminum oxide, etc. ) ; Second, organic materials to prevent fouling; Third, to prevent microbial fouling; Fourth, to prevent the colloidal substances and suspended solid particulate fouling; Fifth, maintain stability of the reverse osmosis device water rate. Reverse osmosis water treatment machine, liquid detergent production machine, washing powder production machine, laundry detergent washing powder production machine production factory house, the previous: liquid detergent production machine is mainly used in industry application