Machineries and Chemical Usage

The company had conducted proper study on how to deal with environmental matters and to its production processes environmentally friendly. Amongst the measures to bring changes on the interactions of process wastes and environment, the following can be taken as measure improvement. Since the magnitude of the problem was not as such simple, the organization prepared to prioritized  the problem and address each of them step by step .In this regard, A responsible resource utilization is improved continuously and consistently. Continuous improvement is guaranteed since yearly improvement plan is devised as per the EMS procedure. Therefore, chrome recovery, water recycling, by-product processing, and reduction of chemical consumption through environmental and quality objectives. By doing so, the generation rate of waste is control that the helped company to give a due concern for those having the highest value.

Implementation  of Environmental Management System (EMS) - preliminary assessment and identification of environmental aspects associated with each processes where crucial to determine the scope and complexity of management System. In doing so, the units where able to identify significant environmental aspects and designed appropriate environmental policy as will as environmental management system.

Environmental policy of the unity of achieving environmental objectives, targets and programs the system was supported with proper documentation as the system standard require. Environmental management system manuals, system document, operational manual, operational controls and standard formant where availed at the point of use to realize the planning to reduce environmental aspect. The two tanneries of ELICO are purposefully established in environmental sensitivity areas particularly near to river. This might happens to be for; the first reason is, to use the river water for miscellaneous activities and the second is, to use the rivers as a recipient of discharge from the tannery. On the other hand, the river is sources of support for different water demanding activities. 

Therefore, major issues associated with untreated effluent discharge and solid waste disposal have had serious interaction through effects like water pollution, soil or land pollution and air pollution.

A-Chrome Recovery

All of the exhaust chrome liquors are segregated from tanning drums, coarse, bar-screened, and then fed into a collection sump. They are then fine-screened using a wage wire screen and delivered in to a mixing-settling tank where the pH is raise to pH 8.5 using a mixture of magnesium oxide and calcium hydro oxide. After a two hours stirring, the chrome precipitates are allowed to settle, the supernatant is discharged to the effluent treatment plant, and the chrome sludge pumped to a reaction vessel where it is acidified using sulfuric acid. The final pH of the regenerated chrome liquor is pH 3.2 -3.4, basicity 33%, and the chrome content 10% Cr2O3. This is used for tanning, with new 33% basic chrome added to make up the required chrome offer.

B-Effluent Treatment

One of the most sensitive areas in the tanning industry is the treatment aspect of effluents and water.  Sulfide containing liquors are maintained separately from the other wastewaters.  After screening, these are delivered into a concrete sump for aeration with manganese sulfate to remove sulfides, and then mixed with the main effluent in a balancing tank.  This mixed effluent is chemically dosed with aluminum sulfate and polyelectrolyte, and then fed into a primary clarification unit.  The settled sludge is pumped from the base into a sludge thickening sump where it is dosed with lime to increase the viscosity, then dewatered using a pair of conventional filter presses.  Conveyor belts are located beneath both presses so that the dewatered cake can be delivered into hoppers for disposal.  The supernatant from primary settling is checked for Chemical and Biological Oxygen demand, suspended solids, chromium and sulfur, and discharged into the adjacent river. If the analysis falls outside the standards set and cannot be rectified immediately, all alternative measures will be taken up to and including the closing the tannery, until the problem is resolved.