[China Aluminum Industry Network] Acid production of aluminum waste mainly from the oxidation workshop acid etching process, neutralization, oxidation processes, spray pre-treatment oil removal, pickling and other processes, during which is rich in various harmful substances or heavy metal salts. The acid mass fraction is not as great, ranging from less than 1 percent in the low to more than 10 percent in the high. Alkaline wastewater mainly comes from oxidation workshop alkali etching, spray pretreatment alkaline washing and other processes. Some of the alkalis have a mass fraction of more than 5%, and some are less than 1 %. Wastewater also occurs from spraying and dyeing. Wastewater, in addition to being rich in acid and alkali, is often rich in oil, paint, fluoride salts, and other inorganic and organic matter.

The acid-alkali wastewater is highly corrosive and must be properly managed before it can be discharged. The general guidelines for the management of acid-alkaline wastewater are as follows: 1 High-concentration acid-alkali wastewater should be given priority for recovery. Based on water quality, water volume, and different technical requirements, it should be reused as much as possible: if there is difficulty in repeated use, or the concentration is low, the amount of water is large. The concentrated method can be used to recover acid and alkali. 2 Low-concentration acid-alkali wastewater, such as the clean water in the pickling tank, and the rinse water in the caustic tank, should be neutralized.

Regarding the handling of neutralization, it is necessary to think first and foremost on the principle of waste disposal. For example, acid and alkali wastewaters are neutralized with each other or waste alkali (slag) is used to neutralize acidic wastewater, and waste acids are used to neutralize alkaline wastewater. In the absence of these conditions, neutralization agents can be selected for disposal.

According to the national standard GB8978-1996 "Water Pollutant Emission Limit" emission requirements are: COD level ≤ 60mg/L, secondary ≤ 120mg/L, suspended matter ≤ 100mg/L, fluoride ion F - ≤ 10mg/L, pH 6-9.

Modern wastewater disposal methods are mainly divided into physical disposal methods, chemical disposal methods and biological disposal methods.

1) Physical Disposal Method Wastewater treatment method that separates physical effects and recovers insoluble dissolved pollutants (including oil film and oil beads) in waste water. General selection of sedimentation, filtration, centrifugal separation, air flotation, transpiration crystallization, anti-saturation and other methods. Contaminants such as suspended solids, colloids and oils are separated from the waste water, so that the waste water is purified.

2) Chemical Disposal Method Dissociates and removes pollutants that are dissolved, colloidal, or converted into non-hazardous substances by chemical reactions and mass transfer effects. The general options are: neutralization, coagulation, oxidation recovery, extraction, stripping, blow-off, adsorption, ion exchange, and electrosweetening.

3) Bio-disposal method Through the metabolic effect of microorganisms, wastewater solutions, colloids, and organic matter, toxic substances, etc. in the form of fine suspensions are converted into wastewater treatment methods for stable and harmless substances. Biological disposal method is divided into two methods: aerobic treatment and anaerobic treatment. The aerobic treatment method is currently commonly used activated sludge, biological filters and oxidation ponds. The anaerobic treatment method, also called biological recovery treatment method, is mainly used for the treatment of high-concentration organic waste water and sludge, and the disposal equipment is used, mainly for the digester.

The intent of disposing of the sludge is to: 1 reduce the moisture content of the sludge and create conditions for disposal, application and transportation of the sludge. 2 eliminate harmful substances that pollute the environment. 3 Regain power and capital to achieve harm. Sludge disposal methods include sludge concentration, sludge digestion, sludge dewatering, and sludge drying. The intention of sludge concentration is to start the dewatering of sludge and reduce the volume of sludge to provide conditions for subsequent disposal. The intention of sludge dewatering is to further dewater the sludge to reduce the moisture content below 80%. Its methods include mechanical dehydration and natural dehydration. Mechanical dehydration method is divided into vacuum suction filtration, pressure filtration and centrifugation. Its advantages are high dehydration rate and small floor space, but the investment is more expensive. The natural drying method has low infrastructure and operating costs, but it has low dewatering power, large floor space, and poor sanitary environment. The purpose of sludge drying is to heat the sludge after dehydration to further reduce the moisture content and reduce the volume. Dry processing method commonly used rotary cylinder dryer. Its strengths are stable and reliable operation, but the larger footprint.

Schindler Moving Walk Spare Parts

Schindler 9500-35 - optimal price/performance

Versatility on demand
Schindler 9500 moving walks share the design versatility of Schindler escalators. There is a wide choice of materials, finishes, colors, sizes, lighting and other options that can be combined to produce customized solutions. It can accommodate transportation lengths up to 100 meters.

• Inclination from 0° to 3°
• Pallet widths of 800 mm and 1000 mm
• Balustrade heights of 900 mm and 1000 mm
• Balustrade panels available in multiple color options, brushed stainless sandwich panels, or powder coated sheet steel
• Two balustrade design variants
• Balustrade profiles and deckings in stainless steel or powder-coated aluminum
• Cladding available in stainless steel or painted sheet steel
• A choice of stainless steel or ribbed aluminum floor covers
• Various lighting options, including balustrade and skirt lighting
• Can be installed indoors and outdoors, covered.
  

Schindler 9500-45 - plenty of space to maneuver

The high-performance moving walk for long distances
With the maximum pallet width of 1400 mm it is possible to accommodate as many as 16,000 passengers per hour. Schindler 9500-45 is able to cover high transport volumes and transportation lengths of up to 150 meters.

Flat construction
The flat construction of Schindler 9500-45, which has no truss and is only 400 mm high in its central part, is a great advantage when space is at a premium.

Long service life
The extremely stable pallets, with a depth of 400 mm, and the durable connection elements are built to withstand even the most punishing use. The robust stainless steel balustrade and the solid, steel-reinforced newel end are virtually resistant to damage caused by carelessness or vandalism.

Schindler 9500 10/15 - inclined moving walk

Especially developed for shopping malls, Schindler 9500 10-15 inclined moving walks provide quiet, comfortable transportation from floor to floor, even with a fully loaded shopping cart. Schindler products never compromise quality, assuring dependable performance and passenger safety. Streamlined and flexible in design, these units leave plenty of room for architectural expression, indoors or out.

Streamlined construction
No moving walk on the market is more compact than the Schindler 9500/10-15.

• Incline ranging from 10° to 12°
• Short installed lengths
• Ideal for covering short distances
  
• 10° flat combs at both ends allow shopping carts to roll on and off easily
• Ideal for outside use
  
• Pallets are guided beneath the skirt for maximum user safety
• Cambered pallet surface delivers excellent grip when damp or wet.
  

Small installation dimensions
Patented short pallets with a depth of only 133 mm greatly reduce the transition curves. As a result, these moving walks require minimum installation space.

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