After using the lye of the bottle washing machine for several shifts, due to the reduction of the activity of the lye, the bottle cannot be cleaned if it is continued to be used. Therefore, at present, most beer manufacturers discharge the lye as wastewater and replace it with new lye.
If the substances affecting the activity of lye can be removed, the lye can be recycled and its use mission can be greatly extended, which can not only save a lot of lye, but also save the energy required to heat the lye from room temperature to 85 ℃, but also save water consumption. These favorable factors can significantly reduce the beer production cost for beer manufacturers. In addition, the recycling of alkali liquor can greatly reduce the discharge of alkali liquor, which is also good for environmental protection. In addition, because the service life of lye is greatly prolonged, workers no longer need to change lye as frequently as before, which will greatly reduce the labor intensity of workers. This is undoubtedly very important for enterprises that pay more and more attention to humanized management.
Alkali liquor recycling is a concrete embodiment of responding to the call of the CPC Central Committee and the State Council to build an energy-saving society. Starting from the recycling of lye and prolonging the service life of lye, beer manufacturers can achieve the purpose of saving lye consumption, saving energy, improving labor intensity, reducing waste alkali discharge, and improving economic benefits.
Difficulties of alkali liquor recycling
The above describes various benefits of alkali liquor recycling, but there are still many difficulties to realizing alkali liquor recycling.
- First of all, we should find out what substances reduce the activity of lye, so that we can reduce blindness, suit the remedy to the case and take corresponding measures to remove these substances. According to relevant studies, there are two main substances affecting the activity of lye, one is paper fiber, the other is aluminum salt. These two substances are the main culprits causing the increase of alkali liquor turbidity. The paper fiber is formed because the label paper on the beer bottle is broken and gradually decomposed into alkali solution. It is in a soft bending state rather than a rigid state, so it is difficult to remove it by ordinary methods. Aluminum salt is formed by dissolving aluminum foil in alkali solution. Now many beer bottles are pasted with neck labels, which are processed from aluminum foil paper. Aluminum foil dissolves quickly in high-temperature alkali solution and forms aluminum salt after chemical reaction. Aluminum salt is a viscous substance, which increases the surface tension of the alkali solution, makes the permeability of the alkali solution to the label paper on the beer bottle worse, reduces the stripping performance of the alkali solution to the label paper, and shows that the label on the beer bottle can not be cleaned. Therefore, aluminum salt is one of the main substances to reduce the activity of alkali liquor, and it is also one of the main objects that we must remove.
- Alkali liquor is corrosive, especially at high temperature above 85 ℃. This alone limits the material of lye treatment equipment and increases the difficulty of equipment sealing.
- Since bottle washing is continuous, that is, substances that reduce the activity of alkali liquor are also produced continuously, which requires that the equipment for treating alkali liquor also have continuous on-line working ability. Otherwise, the turbidity of alkali liquor is too large, which will seriously affect the bottle washing effect. This is the main reason why the effect of recovering alkali liquor by natural precipitation method with large recovery tank is not obvious.
- Large alkali liquor treatment capacity. The alkali liquor is mainly concentrated in the first tank of the bottle washing machine. The volume of alkali tank 1 varies greatly depending on the model of bottle washing machine, but it is generally 15m3? 5M3, that is, continuous alkali treatment is required.
- As the layout of beer filling workshop is relatively compact, it is unlikely to have large space for alkali liquor treatment equipment, so alkali liquor treatment equipment is required to be small and compact. (beer clarification and filtration)
- High degree of automation and equipment reliability are required. Beer manufacturers generally have a fixed number of workers in the workshop. It is unlikely to specially allocate one operator for the alkali liquor treatment equipment. Generally, personnel in other posts hold the post concurrently. Therefore, the lye treatment equipment must have the function of automatic cleaning, have a high degree of automation, and have high operation reliability, so as to meet the actual requirements of beer manufacturers. In addition, the alkali liquor treatment equipment should preferably have automatic protection and automatic alarm functions.
Analysis of economic and social benefits of alkali liquor on-line wedge wire filter element
Using lye online filter elements can bring great economic and social benefits to beer manufacturers. The specific analysis is as follows.
- Economic benefit analysis: economic benefits are divided into direct economic benefits and indirect economic benefits. The direct economic benefit is that the use of lye online filter can save the amount of bottle washing agent for beer manufacturers, save the steam required to heat lye from room temperature to working temperature, and reduce the discharge and treatment of wastewater. According to the calculation of the user manufacturers, each alkali liquor online filter can create more than 100000 yuan of direct economic benefits for beer manufacturers every year.
- The indirect economic benefit is that the use of alkali on-line filter can delay the blockage of spray pipe to a great extent, thus reducing the shutdown and maintenance time of spray pipe; In addition, the use of online filter for lye can prolong the service life of lye and save the time for users to replace lye, which is of special significance in the peak season of beer in short supply. According to the empirical data, due to the reduction of downtime, each alkali liquor online filter can produce more than 1000 kiloliters of beer for users in each peak production season, so as to improve the production efficiency and economic benefits of users. Practice shows that users can recover the cost of alkali liquor online filter within 1 ~ 2 years.