System and method for treating BDO wastewater by heterogeneous catalytic oxidation coupled biochemical technology

Abstract

The invention provides a system and a method for treating BDO wastewater by a heterogeneous catalytic oxidation coupled biochemical technology. The system includes, but not limited to, following components: a flocculation reaction tank, an inclined tube sedimentation tank, an intermediate water tank, a catalytic oxidation reactor water inlet pump, a security filter, a heterogeneous catalytic oxidation reactor, and the like. The system and the method have the beneficial effects that suspended solids in the wastewater are reduced to be below 50mg / L through chemical flocculation and sedimentation, so that the phenomena of filler blockage and sludge leakage of an anaerobic system caused by over-high concentration of suspended solids are avoided; organic pollutants in raw water are partially oxidized through heterogeneous catalytic oxidation, molecular structures of PTMEG, THF and formaldehyde are damaged by oxidation, the B / C value of wastewater is high, conditions are provided for stableoperation of an anaerobic reactor and a subsequent system; oxidation of organic pollutants in raw water through heterogeneous catalytic oxidation is controlled through the addition amount of an oxidizing agent, the organic load of inlet water of a biochemical system is controlled, the occupied area of a biochemical system is small, the sludge treatment cost is low, and the operation cost of an aeration system is low.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to a system and method for treating BDO wastewater by heterogeneous catalytic oxidation coupling biochemical technology. Background technique [0002] 1,4-butanediol is an important organic fine chemical raw material, which is widely used in the fields of medicine, chemical industry, textile, papermaking, automobile and daily chemical industry. At present, the commonly used production process is mainly alkyne aldehyde method, and the products include 1,4 butanediol (BDO), 1,4 butynediol (BYD), polytetrahydrofuran (PTMEG) and so on. Among them, tetrahydrofuran (THF) and PTMEG are toxic and heterocyclic organic substances, which are refractory from structural analysis and are extremely harmful to human health. When the concentration of THF in the wastewater reaches 200mg / L, the anaerobic microorganisms are significantly inhibited, and the gas production decreases sharply. ...

AI Technical Summary

Problems solved by technology

Among them, the "UASB + aerobic combined process" process has the following disadvantages: (1) The anaerobic reactor (UASB) is significantly inhibited by the biological toxicity of tetrahydrofuran, polytetrahydrofuran, and formaldehyde in wastewater, and the operation is unstable, easy to acidify, and the removal efficiency of pollutants is low. , the aerobic system load is too high, and the discharge water quality is not up to standard

(2) The load of the aerobic biochemical system is high, the daily biological sludge output is large, and the cost of sludge disposal is high

(3) The impact load of water quality and water volume is large, the stability of the system operation is poor, and the effluent cannot meet the national first-class A discharge standard

However, when the iron-carbon catalyst operates under low pH conditions, the reaction time is long, the amount of iron dissolved is large, and a large amount of iron sludge is generated, which is easy to cause blockage and hardening of the iron-carbon packing, high backwash frequency, and short packing replacement cycle.

Images