Process Operation of Effluent Treatment Plant

Process Operation of Effluent Treatment Plant:

The treatment concept is PhysioChemical with Filtration System.

Effluent from the sweater washing floor flows by gravity through the drain pipe line and after passing through screener it gravitates to the collection pit from where it is passed to the equalization tank. Untreated homogenized effluent is pumped from equalization tank to the Primary Clarifier. Coagulant flocculants solutions are dosed to on line which is synchronized with effluent pumps. The solid is being separated from clarifier unit. The upper clear water is collected to the intermediate PVC tank of capacity 5000L (Feed forwarding tank for tertiary Treatment) tank and the solid from bottom is transferred to the sludge Thickening Tank. The suparnent (Upper flow) is recycled to the equalization tank and the bottom thicker sludge is transferred to the sludge drying beds by gravity. The treated water from intermediate tank is passed through the multi-grade sand filter. Finally it is collected to the treated reservoir as to reuse or discharge to the environment. The influent pH range is 6-9 so neutralizer is not required.

Sludge Handling:

 The bottom thicker layer of sludge is being transferred to sludge drying bed after three hours interval. There are two sludge drying bed in the plant. When one of the bed is filled by sludge it is kept for drying and another is in operation. By this way the upper solid semi dried sludge is bagged to keep in the campus for six months. After six months it is dumped to the safe place.