Manganese sand filter using the matters needing attention

Manganese sand filter, also known as iron manganese filter, commonly used underground well water and wastewater treatment, water treatment equipment is common, is different from ordinary quartz sand filter, activated carbon filter, many media filters, and so on mechanical filter, manganese sand filter is mainly to remove water fe mn ions.

specified in the drinking water hygiene standards in our country, the iron content is 0 or less. 3 mg/L, manganese content is 0 or less. 1 mg/L, long-term drinking water containing high iron, manganese adverse to human body. In the textile, paper making, brewing, food and other industries, the excess iron and manganese will affect the quality of our products and make items generated spots, corrosion of equipment. Commonly used iron removal filter is the iron after aeration ( Manganese) The groundwater flows through manganese sand or characteristics of quartz sand filter layer, the iron ( Manganese) Oxidation, curing and remove.

manganese sand filter is a pressure vessel, in a tubular filter yuan, to the horizontal or vertical cylinder structure. Water flow from the side, will flow evenly distribution in the filter element on the surface, the yuan filtration, and then out of filter element, to catchment type, water flow type filter by set. Run for a period of time, water quality decline or filtering resistance is too large, it must be washed, so that we can greatly improve the manganese sand filter materials and practical life and saving energy consumption, guarantee the production water. Many towns and industrial and mining enterprises with groundwater as water. Rock in the earth's crust, due to the erosion of carbonate, organic matter on the effect of iron and the reason such as the reduction of trivalent iron oxide, can make a lot of iron into the groundwater.

manganese sand filter cleaning should pay attention to the following problems:

1, pH value in the process of groundwater in addition to iron and manganese, pH value are the key factors influencing the iron and manganese removal. The higher the pH value, the greater the oxidation rate of Fe2 + and Mn2 + fast, iron, manganese is easy to be removed. When pH > 5. 5, the pH value every rise. The oxidation rate of 0, Fe2 + 100 times will be increased, the oxidation rate of Mn2 + when the pH > 9 will be quickened significantly.

2, backwash strength iron removal filter is common in the process of practical manganese sand 'saturated' or 'passivation' phenomenon, in addition to the ability of manganese is reduced greatly. Main cleaning method for backwashing, backwashing way for joint air water backwashing, 10 - strength of backwashing water 12 l / s• M2, according to the specific conditions of use different backwashing duration will have certain difference, generally for about 30 minutes, the general rule is to observe the backwashing water, when the water gradually become clear or almost clear water backwashing process is over. Also can use regenerant wash three times repeatedly, final reoccupy water leaching to neutral, you can reuse again.

3, chemical cleaning

manganese sand filter during the work, the impurities in the filter layer, uneven distribution of impurities through shades, and every time they recoil may not fully clear filter material of attached sludge and break large particles of mud particles, manganese sand filter in the filter or recoil at the same time, the filter layer by hydraulic conditions is uneven, so that when impurities through the surface of the deep filter impurities trapped, form 'blanket' mud filter, filter material caused by harden and the need for chemical cleaning, soaking with special detergent circulation, to remove colloidal and organic particle, to descaling and metal oxide, in order to restore normal filter material processing effect.