Jun. 15^th, 2018

The treatment of wastewater from the salt chemical industrial area in Zhangshu City, Jiangxi Province is a chronic problem that has not been solved for many years. Under strict environmental protection supervision requirements, the local management committee requested technical assistance from SafBon. SafBon was asked to assist Zhangshu Salt Chemical Industry Park to solve the technical problem of wastewater discharge failure. Eucalyptus salt chemical wastewater has the characteristics of low BC ratio, poor biodegradability, high salt content and complex composition, and the upstream companies themselves have advanced oxidation treatment systems. Therefore, such water quality is extremely difficult to degrade COD wastewater. With the conventional biochemical system treatment, when the COD degradation rate is difficult to exceed 30%, even if the treatment load is reduced and the residence time of hydrolysis and acidification is increased, the COD degradation rate is difficult to reach 50%.

The membrane bioreactor (MBR) used in the pilot project is a fully automated small integrated device installed by the German ItN company. It uses a compact MBBR biofilm reactor as the front section and a ItN ceramic flat membrane MBR system as the latter, and constructs a flexible and changeable small biochemical reverse integrated system. The device combines the compound biochemical function of MBBR and the MBR high sludge load function together, with a full automatic control system, which can simulate a variety of process flow, including A-O, A²/O, A-O-A and so on.

In order to verify the universal high efficiency characteristics of the pilot plant, the technical personnel set the system process as the most common A²/O+MBBR, and set up a comprehensive and detailed test procedure, including single-machine commissioning, equipment clean water linkage debugging, low pollution Mud feed water commissioning, high sludge volume water commissioning, and debugging of different cleaning control methods. During the whole commissioning process, the maximum sludge concentration reached 7000mg/L, the average removal rate of COD was 51.3%, the total phosphorus removal rate was 63.8%, and the average removal rate of ammonia nitrogen was 95.3%. Although the target of the pilot plant in camphor tree is to degrade COD, the above data also show that it has good effect on ammonia nitrogen and total phosphorus in sewage.

Through the success of this pilot project, SafBon confirmed the successful application of German ItN  ceramic membrane as a MBR technology in salt chemical wastewater treatment.