Treatment device and treatment method for nitrogen and phosphorus of biomedicine wastewater

Abstract

The invention discloses a zero-discharge treatment process for nitrogen and phosphorus of biomedicine wastewater and belongs to the field of industrial wastewater treatment in environmental protection. A treatment device for nitrogen and phosphorus of the biomedicine wastewater comprises a high-concentration wastewater treatment zone, a low-concentration wastewater treatment zone, an RO reverse osmosis purifying zone and a deionizer; high-concentration phosphorus-containing wastewater of biomedicine workshops is firstly added with a ferric, magnesium or aluminum salt for chemical phosphorous removal, effluent is uniformly mixed with low-concentration wastewater, then, the mixture is pumped into an A2 / O process for biochemical treatment, effluent of a biochemical unit is subjected to ultraviolet disinfection, then, is subjected to rough filtration and refined filtration and then is subjected to multistage RO reverse osmosis treatment, the concentration of nitrogen and phosphorus in light water, which is finally discharged from a reverse osmosis unit, is extremely low, and thus the requirements of the wastewater on zero nitrogen-phosphorus discharge are met; concentrated water generated from RO reverse osmosis is subjected to anion-cation exchange and then returns to an RO system for treatment again; and acid / base wastewater generated during the regeneration of exchange resin is neutralized and then is subjected to outwards-shipped disposal, and subsequent washing water enters the RO system for treatment.

Description

technical field [0001] The invention belongs to the field of industrial wastewater treatment in environmental protection, and in particular relates to a nitrogen and phosphorus treatment device for biomedical wastewater and a treatment method thereof. Background technique [0002] Since the 1960s, with the dense population and economic development in the world, lakes and rivers have been polluted by organic matter such as nitrogen and phosphorus, which has attracted the attention of many developed countries and regions, and the movement of banning and limiting phosphorus has begun worldwide. When the total phosphorus in the natural water body is greater than 200mg / m 3 , inorganic nitrogen greater than 300mg / m 3 , the water body is in a state of eutrophication. The nitrogen and phosphorus in the eutrophic water body promote the rapid growth of algae in the water. The growth of a large number of algae consumes the oxygen in the water, causing the plankton to die due to lack o...

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Problems solved by technology

Second, some river sections flowing through towns and some ditches, ponds and dams at the junction of urban and rural areas are generally heavily polluted, and due to organic pollution, there are many black and odorous water bodies, many people are affected, public attention is high, and dissatisfaction is high

[0006] a. When the concentration of nitrogen and phosphorus in the influent water is high, the effect of biochemical phosphorus and nitrogen removal is not good, resulting in a large subsequent treatment load and an increase in the number of RO treatment stages;

[0007] b. Subsequent use of three-effect evaporation crystallization or concentration increases the one-time investment and operating costs of wastewater treatment facilities

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