Method for advanced treatment and reuse of wastewater

Abstract

The invention provides a method for advanced treatment and reuse of wastewater. The method is characterized in that a biochemical device adopting a biological aerated filter comprises a water inlet pipe, a backwashing water inlet pipe, a backwashing air inlet pipe, an aerator pipe, a backwashing drain pipe, a water outlet pipe, water distributors, supporting fillers, ceramic fillers, a cell body and a filter plate, wherein energy consumption is only 60% of that of a contact oxidation method after secondary wastewater is subjected to biochemical treatment in the biological aerated filter and organic pollutants are removed; a separation device of an ultrafiltration pressing film comprises a biological aerated filter water discharging tank, a lift pump, a safety filter, ultrafiltration films, an ultrafiltration water production pipe and an ultrafiltration concentrated water pipe, wherein the ultrafiltration films can be used for intercepting matters with molecular weights of 3*10000-1*10000 and removing most colloidal silicon and organic matters in the water; and an electric-absorption desalting device comprises an ultrafiltration device water discharging tank, a water supply pump, a filtering device, an electro-adsorption module, a water production pipe, a reuse water tank, a regenerative pump and a regenerative water outlet, wherein raw water lifted by the regenerative pump is flushed by a short-circuited and standing module so as to regenerate an electrode, and a pollution discharge process is a backwashing process of the module.

Description

technical field [0001] The invention relates to advanced sewage treatment technology, and is especially suitable for replenishment of recycled circulating water for advanced sewage treatment. By utilizing the linkage technology of biological aerated filter, ultrafiltration membrane and electric adsorption, the method realizes the purpose of sewage reuse. Background technique [0002] At present, the "biological aerated filter (BAF) + reverse osmosis (RO)" process is basically used for industrial high-end reuse water. RO is reverse osmosis technology, which is the opposite process of natural osmosis after applying pressure to the concentrated solution at the junction of the semi-permeable membrane. The semi-permeable membrane separates the pure water from the salt water, and the water molecules will pass through the membrane from the pure water side to the salt water side, so that the liquid level on the salt water side rises to a certain height, when the penetration reaches ...

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Problems solved by technology

RO is reverse osmosis technology, which is the opposite process of natural osmosis after applying pressure to the concentrated solution at the junction of the semi-permeable membrane. The semi-permeable membrane separates the pure water from the salt water, and the water molecules will pass through the membrane from the pure water side to the salt water side, so that the liquid level on the salt water side rises to a certain height, when the penetration reaches a dynamic equilibrium state , there is a certain osmotic pressure of the solution on both sides of the semipermeable membrane, and a pressure greater than the osmotic pressure of the solution is applied on the side of the salt water, and the water molecules pass through the membrane from the side of the salt water to the side of the pure water in reverse, making the salt water desalination, but reverse osmosis technology has high requirements for wastewater pretreatment, and the initial investment is relatively large. Due to the characteristics of semi-permeable membranes, the desalination rate is high and cannot be adjusted. High-end industrial reuse water (such as circulating water replenishment, etc.) that does not require a high desalination rate is a waste, and there are economically unreasonable problems.

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