How to Clean Marine Products Industrial Sewage?

There is a large amount of wastewater from marine products processing, with high concentration of organics, and a large number of macromolecular organic substances such as protein and oil. Seawater is used for the processing, resulting in a large number of wastewater from high salinity aquatic products processing. The water quality is complex and difficult to be treated. In terms of wastewater treatment of marine products Industrial, the traditional technologies adopted at home and abroad are mainly coagulation + contact oxidation process, air flotation - enhanced A-A / O process. The traditional processes, such as flotation + A / O + CASS process, hydrolysis acidification + biological contact oxidation process, UASB + aerobic treatment process, flotation + SBR process, which are often difficult to meet the discharge standards. 

The influent water quality of 3000 t / D seafood processing wastewater is cod 4000mg / L, BOD 1000mg / L, SS 500mg / L, 200mg / L ammonia nitrogen and pH value of 6-9 in Zhoushan. It is very difficult to treat this kind of wastewater. It has done a lot of small and medium-sized experiments on this kind of wastewater, and finally determined the process route of "Anaerobic + aerobic + flat ceramic membrane pc-mbr". This process is highly feasible, economical and reasonable, and suitable for local conditions.

Zhoushan's 3000-ton / day marine product processing wastewater construction cycle only took three months. It completed the construction task of the project on time and in terms of quality and quantity under the severe weather of Zhoushan in winter with rain and typhoons. After the project was completed, it was put into trial operation for two months. The effluent quality was stable and reached the national level A discharge standard.

PC-MBR(flat ceramic membrane bioreactor) process advancement:

1) The quality of the effluent is high and stable

Due to the high-efficiency separation of the membrane, the separation effect is far better than that of the traditional sedimentation tank. The treated effluent is extremely clear, suspended matter and turbidity are close to zero, bacteria and viruses are greatly removed, and the effluent can be reused as non-potable municipal miscellaneous water directly . The system technology improves the overall removal efficiency of pollutants by the reaction device and ensures good effluent water quality.

2) System shock resistance

This process realizes the complete separation of hydraulic retention time (HRT) and sludge retention time (SRT). Membrane separation also allows microorganisms to be completely intercepted in the bioreactor, so that the system can be maintained and the volume load can be greatly increased. Meanwhile, the reactor has good adaptability to various changes in the water load (water quality and water volume), and shock resistance. Finally it can stably obtain high-quality effluent water quality.

3) Less excess sludge production

There is a high concentration of microorganisms in the reactor, which makes the system operate under high volume load and low sludge load, and the output of excess sludge is low, which reduces the cost of sludge treatment.

4) Small floor area

The bioreactor can maintain a high concentration of microorganisms, with a high volume load of the treatment device and a large area saving; the system is simple, compact, and covers a small area, which is suitable for any occasion. It also can be made into ground, semi underground and underground.

5) Removal of ammonia nitrogen and refractory organics

Due to the complete interception of microorganisms in the bioreactor, it is conducive to the interception and growth of slow-growing microorganisms such as nitrifying bacteria, and the nitrification efficiency of the system can be improved. At the same time, the HRT of some refractory organics in the system can be increased, which is conducive to the improvement of the degradation efficiency of refractory organics.

6)Convenient operation and management

The process realizes the complete separation of HRT and SRT, and the operation control is more flexible and stable. It is a new technology easy to realize the equipment in sewage treatment. It can realize the microcomputer automatic control, thus making the operation management more convenient.

7) Easy to transform the traditional process

The system is simple to upgrade and transform. The process can be used as the advanced treatment unit of traditional sewage treatment process, and has a broad application prospect in the field of advanced treatment of effluent from secondary sewage treatment plant, so as to realize a large number of reuse of urban sewage.