Food processing wastewater treatment equipment

Food processing wastewater treatment equipment——Introduction to Pre treatment Process

The pre-treatment process consists of a grille and a regulating tank, which are supporting facilities for the equipment.

① Grid well

The coarse grille can intercept large floating and block shaped objects to prevent their accumulation, sedimentation, and blockage of water pumps and pipelines, ensuring the normal operation of subsequent treatment processes.

② Regulating pool

The function of a regulating pool is to regulate and homogenize water quality and quantity. To prevent a decrease in the treatment capacity of the entire sewage treatment system due to significant fluctuations in water quality and quantity, and to improve the treatment efficiency of subsequent treatment systems, a regulating tank is installed, which can significantly reduce the capacity and power consumption of treatment equipment.

Install medium and low level control devices at the end of the regulating pool. When the water level in the regulating pool reaches the set medium level, start the lift pump. When the low level is reached, stop the lift pump to save power consumption and reduce the risk of motor damage.

Food processing wastewater treatment equipment——Characteristics of water treatment

1Water quality characteristics:(1)The urban population is relatively small, widely distributed and scattered, and most of them do not have sewage discharge pipelines;(2)The concentration of urban domestic sewage is low and varies greatly;(3)The properties of most domestic sewage are not significantly different, and the water itself does not contain heavy metals or toxic substances(But with the improvement of people's living standards, some domestic sewage may contain heavy metals and toxic and harmful substances)Containing a certain amount of nitrogen and phosphorus, the water quality fluctuates greatly and has strong biodegradability;(4)The water quality varies at different time periods;(5)The sewage discharged from the toilet has poor water quality, but it can be used as fertilizer in the septic tank.

2Water quantity characteristics:(1)The amount of domestic sewage in general towns is relatively small. Except for small towns, the urban population is dispersed and the water volume is relatively small, resulting in a relatively small amount of domestic sewage generated;(2)The coefficient of variation is large, and the living habits of residents are similar, resulting in a larger discharge of urban domestic sewage in the morning and evening compared to the daytime, and a smaller discharge at night, which may even be interrupted. The water volume changes significantly, that is, the discharge without water is discontinuous and has the characteristic of large variation amplitude;(3)There is a peak period in the morning, noon, and afternoon.

3Characteristics of emission system (integrated domestic sewage treatment equipment in tourist attractions): Urban domestic sewage is generally discharged in an extensive manner. Many towns do not have a complete sewage discharge system, and sewage is discharged along roadside ditches or road surfaces to nearby water bodies. A small number of areas have well-established sewage discharge systems.

Food processing wastewater treatment equipment——Selection of processing technology

Based on the above inflow and outflow water volume and quality, we consider that the selection of Wuhan domestic sewage treatment process must follow the following approach:

1The overall approach adopts mature and reliable methodsA/OThe biological contact oxidation method is the treatment process, supplemented by physical and chemical treatment methods such as grid interception, sedimentation tank clarification, disinfectant disinfection, and combined deep treatment;

2Firstly, the wastewater is intercepted through a grille for pretreatment, with the aim of initially reducing the content of inorganic particulate matter and improving the identity and biodegradability of the wastewater; Then, through anaerobic and aerobic processesA/OThe biological contact oxidation method utilizes the action of biofilm to first convert organic pollutants into ammonia nitrogen, while removing both organic matter and ammonia nitrogen through aerobic nitrification and anaerobic denitrification processes. The biochemical tank is equipped with a new high-density elastic three-dimensional packing material, which has the advantages of high load, easy construction, small volume, stable and reliable operation, convenient management, and easy maintenance and replacement; The effluent from the biochemical tank enters the vertical flow sedimentation tank for solid-liquid separation. The vertical flow sedimentation tank has the characteristics of good solid-liquid separation effect, low investment, strong adaptability to impact load and temperature changes, and easy construction; The effluent from the vertical flow sedimentation tank enters the disinfection tank for disinfection treatment, ensuring that all indicators of the treated sewage meet the standards comprehensively.

3The process flow is simple, the engineering cost is low, the operation is economical, and it is easy to manage.

Food processing wastewater treatment equipment——Equipment advantages

1. Compact equipment with minimal footprint

Due to the increase in sludge concentration inside the bioreactor2～5Compared with conventional biological treatment processes, membrane bioreactors can significantly reduce the footprint by doubling the capacity load and replacing secondary sedimentation tanks and filtration equipment with membrane modules;

2. High quality and stable effluent water quality

Due to the efficient separation effect of the membrane, the separation efficiency is much better than that of traditional sedimentation tanks, and the treated water is extremely clear, Suspended solids and turbidity are close to zero, and bacteria and viruses are significantly removed The effluent quality is better than the domestic miscellaneous water quality standards issued by the Ministry of Construction（CJ25.1-89）It can be directly reused as non potable municipal miscellaneous water.

At the same time, membrane separation also completely intercepts microorganisms in the bioreactor, allowing the system to maintain a high concentration of microorganisms. This not only improves the overall removal efficiency of pollutants by the reaction device, but also ensures good effluent quality It has good adaptability to various changes in inflow load (water quality and quantity), is resistant to impact load, and can stably obtain high-quality effluent water quality.

3. Low production of surplus sludge

This process can operate under high volume load and low sludge load, with low residual sludge production (theoretically achieving zero sludge discharge), reducing sludge treatment costs.

4. Can remove ammonia nitrogen and difficult to degrade organic matter

Due to the complete interception of microorganisms in the bioreactor, it facilitates the retention and growth of slow proliferating microorganisms such as nitrifying bacteria, thereby improving the nitrification efficiency of the system. At the same time, it can increase the hydraulic retention time of some recalcitrant organic compounds in the system, which is beneficial for improving the degradation efficiency of recalcitrant organic compounds.

5. Convenient operation and management, easy to achieve automatic control

This process achieves hydraulic retention time（HRT）Retention time of sludge（SRT）The complete separation and more flexible and stable operation control are new technologies that are easy to implement in sewage treatment equipment. They can achieve microcomputer automatic control, making operation and management more convenient.

6. Easy to transform from traditional craftsmanship

This process can serve as a deep treatment unit for traditional sewage treatment processes, and has broad application prospects in areas such as deep treatment of effluent from urban secondary sewage treatment plants (thereby achieving large-scale reuse of urban sewage).

Food processing wastewater treatment equipment——The domestication steps of activated sludge for underground integrated sewage treatment equipment

1.Confirm through analysis that all indicators of incoming water are within the allowable range,Prepare to enter the water.
2.Starting to enter a small amount of production wastewater,The entry volume shall not exceed that before domestication Processing ability20％,Simultaneously replenish fresh water,Fecal water andNH4Cl.
3.After achieving good processing,Can increase the amount of production wastewater added,Each increase should not exceed10～20％,Simultaneously reduceNH4CLdosage.
4.Continue to increase the amount of production wastewater added,Until full load.Full load operation phase,Due to the cultivation and maintenance of high concentrations in the pool,A sufficient amount of activated sludge with high activity,The mixed liquid after aeration in the poolMLSSreach5000mg/1,This process synchronously monitors dissolved oxygen,Control the operation of the aerator,And conduct biological phase microscopy of sludge.