CN-122010298-A - Method for treating sulfamethoxazole wastewater by utilizing anaerobic membrane bioreactor

Abstract

The invention discloses a method for treating sulfamethoxazole wastewater by using an anaerobic membrane bioreactor. According to the method, an anaerobic membrane bioreactor is utilized, an air pump is externally connected to maintain full mixing of mud and water, a flat membrane assembly is arranged in the anaerobic membrane bioreactor, anaerobic sludge is inoculated in the anaerobic membrane bioreactor, SMX wastewater is pumped in from the bottom of the anaerobic membrane bioreactor, under the anaerobic condition, the SMX wastewater upwards flows through the anaerobic membrane bioreactor, organic matters in the wastewater are degraded together through anaerobic metabolism of microorganisms and adsorption of biological membranes, and carbon-sulfur conversion reaction is carried out, so that COD, sulfate and SMX in the wastewater are removed efficiently. The method is simple and convenient to operate, controllable in process, suitable for treating SMX wastewater with different concentrations, and provides a feasible technical scheme for industrial treatment of antibiotic wastewater.

Inventors

• LI YAN
• JI YIMING

Assignees

• 南京理工大学

Dates

Publication Date

20260512

Application Date

20260323

Claims (7)

1. 1. The method for treating sulfamethoxazole wastewater by utilizing the anaerobic membrane bioreactor is characterized by comprising the following steps of: utilize anaerobic membrane bioreactor, external connection air pump maintains mud-water intensive mixing, and inside is equipped with dull and stereotyped membrane module, and the reactor internal connection anaerobic sludge pumps in SMX waste water from the reactor bottom, and under the anaerobic condition, upwards flows through the reactor, and organic matter in the waste water is degraded jointly through the anaerobic metabolism of microorganism and the adsorption of biomembrane to carry out carbon sulfur conversion reaction, realize the high-efficient removal to COD, sulfate and SMX in the waste water.
2. 2. The method of claim 1, wherein the COD in the SMX wastewater is greater than or equal to 1500 mg/L and the sulfate is greater than or equal to 750 mg/L.
3. 3. The method of claim 1, wherein the carbon to sulfur ratio of the feed water is adjusted to 2:1.
4. 4. The method of claim 1, wherein the air pump has a flow rate of 3L/min.
5. 5. The method of claim 1, wherein the anaerobic sludge is inoculated at a concentration of 10-20 g/L.
6. 6. The method of claim 1, wherein the SMX wastewater has a SMX concentration of 0 mg/L to 5 mg/L but not 0 mg/L.
7. 7. The method according to claim 1, wherein the reactor temperature is maintained at 35±1 ℃ and the hydraulic retention time is 24 to 36 hours.

Description

Method for treating sulfamethoxazole wastewater by utilizing anaerobic membrane bioreactor Technical Field The invention belongs to the technical field of sewage treatment, and particularly relates to a method for treating sulfamethoxazole wastewater by using an anaerobic membrane bioreactor. Background With the wide application of antibiotics in medical, pharmaceutical, aquaculture and industrial production, a large number of antibiotics and their metabolites are discharged into the environment through wastewater, causing water pollution and potential public health risks. Wherein, the sulfamethoxazole is widely used as common sulfamethoxazole in industrial and medical wastewater, and the residue thereof can inhibit the activity of microorganisms and reduce the stability and the wastewater treatment efficiency of a wastewater treatment system. The research results of Jia et al in recent years show that UASB can realize organic matter degradation and certain degree of Sulfamethoxazole (SMX) removal under certain organic load and COD/SO 42- ratio, but the treatment process is greatly influenced by high sulfate concentration and antibiotic toxicity, the fluctuation of the removal efficiency is obvious, and the adaptability of the system to high concentration SMX is insufficient, thus indicating that UASB has larger performance bottleneck in the treatment of high concentration antibiotic wastewater （JIA Y, KHANAL S K, ZHANG H, et al. Sulfamethoxazole degradation in anaerobic sulfate-reducing bacteria sludge system[J]. Water Research, 2017, 119: 12-20.）. Anaerobic membrane bioreactor (AnMBR) has become an ideal technology for treating high-concentration organic wastewater and antibiotic wastewater due to the advantages of low energy consumption, low sludge yield, high organic matter removal efficiency and the like. However, in SMX wastewater treatment, the anaerobic membrane bioreactor system still has the problems that (1) the wastewater treatment efficiency is reduced, the COD removal rate is reduced due to the inhibition effect of high-concentration SMX on microbial communities, the carbon-sulfur conversion process is blocked, the sulfate reduction efficiency is reduced, (2) the degradation of antibiotics is limited, the activity of key functional microorganisms (such as sulfate reducing bacteria and methanogens) can be inhibited due to high-concentration residues of the SMX, the SMX removal efficiency is low, the stable degradation of antibiotics in the wastewater is difficult to realize, and (3) the optimization of the operation conditions is insufficient, the conventional AnMBR technology mostly adopts fixed operation parameters when treating the wastewater with different concentrations of antibiotics, lacks a system optimization scheme aiming at different SMX concentrations, and is difficult to improve the SMX degradation efficiency while guaranteeing the high removal rate of COD and sulfate. Disclosure of Invention The invention aims to provide a method for treating sulfamethoxazole wastewater by using an anaerobic membrane bioreactor. According to the method, the efficient wastewater treatment and carbon-sulfur conversion of the AnMBR system under different SMX concentrations are realized by regulating and controlling the water inlet conditions and the operation parameters. The technical scheme for realizing the purpose of the invention is as follows: The method for treating sulfamethoxazole wastewater by utilizing the anaerobic membrane bioreactor comprises the following steps: utilize anaerobic membrane bioreactor, external connection air pump maintains mud-water intensive mixing, and inside is equipped with dull and stereotyped membrane module, and the reactor internal connection anaerobic sludge pumps in SMX waste water from the reactor bottom, and under the anaerobic condition, upwards flows through the reactor, and organic matter in the waste water is degraded jointly through the anaerobic metabolism of microorganism and the adsorption of biomembrane to carry out carbon sulfur conversion reaction, realize the high-efficient removal to COD, sulfate and SMX in the waste water. Further, in the SMX wastewater, COD is more than or equal to 1500 mg/L, and sulfate is more than or equal to 750 mg/L Further, the carbon-sulfur ratio of the inlet water is adjusted to be 2:1. Further, the air pump flow rate was 3L/min. Further, the inoculation concentration of the anaerobic sludge is 10-20 g/L. Further, in the SMX wastewater, the concentration of SMX is 0 mg/L-5 mg/L but not 0 mg/L. Further, the temperature of the reactor is kept at 35+/-1 ℃ and the hydraulic retention time is 24-36 hours. Compared with the prior art, the invention has the following advantages: (1) The UASB reactor can realize certain removal of antibiotics such as Sulfamethoxazole (SMX) when treating medical wastewater, but when the water inflow concentration is higher or the reaction condition is not optimized, the removal efficiency is obv