 So, in this module we will talk about the affluent disposal into either into the land or into the river waters. So, as concerned affluent disposal procedure which is finally adopted by a particular manufacturer is obviously determined by a number of factors of which the most important is the control exercise of the relevant authorities in many countries on the quantity and the quality of the waste discharge. As I have already told you in our previous module that the range of the affluent disposal method which can be considered number one the affluent is discharged to land, river or a sea in an untreated state. And the second is affluent is removed and disposed of the landfill site as or is insurrated. So, as concerned the affluent is partially treated on the site prior to further treatment at the disposal by one of the other routes. So, the part of the affluent is untreated and discharged as one or two strategy the remainder is treated as a sewage work or at the site before discharge. So, all of the affluent is sent to the sewage work for treatment although there might be reluctance by the sewage work to accept it possibly resulting in some preliminary on site treatment being required or discharge rate and affluent composition defined. So, all the affluent is treated at a factory before discharge. So, as concerned these are the treatment strategies one is in situ and other is known as ex situ. So, as concerned the in situ where that affluent is produced we will have the different treatment mechanism there. So, as concerned the ex situ treatment first we collect and first we send it to some sewage treatment we have to be kept in all the sites accordingly. So, we have to keep the all these as concerned the disposal of the affluent to the severs the municipal authorities and the water treatment companies which accept the trade affluence because the factory has the direct agreement with those sewer treatment because if each and every industry has its own affluent treatment plant that it will be more costly. Same in an industrial zones there is a composite in a united affluent treatment which we called as mostly the sewer treatment plants. So, as you can see that in if we visit to the Kassur leather industry part there is a government have installed affluent treatment plant there. So, that is why if there is an agreement and then the factory has to pay some cost for the affluent treatment. So, then the sewage work has to the capacity to go with the estimated volume and the affluent because according to agreement according to the capacity of the total sewage system very critical. So, the affluent will be interfered with the treatment process. So, the composition of the affluent that should be remain the same because at the time of the registration at the time of the booking at the time of the agreement with the sewage system that should be otherwise that can effect the whole treatment. So, there are no compound present in the affluent which will pass through the sewage work unchanged and then cause the problem when discharged into a water course. So, as concerned the fermentation waste may be treated onsite or at an sewage treatment plant. So, by all that three methods either that is the physical method, chemical method or the biological methods. So, the final choice of the treatment and the disposal process used in each individual factory will depend upon the local circumstances and the local legislations and the regulations and containment level. So, as concerned the treatment process that may be described as follow. So, the first one is the primary treatment in which the physical and the chemical methods in which mostly the sedimentation and coagulation methods are mostly used. As concerned the secondary treatment mostly the biological methods that is activator sludge conducted after the primary treatment. So, as concerned the tertiary treatment in which the physical, chemical and biological methods mostly microstrainers, sand filters, grass plot, irrigation that is used to improve the quality of the liquor for the previous stages. So, as concerned the fourth the sludge conditioning and the disposal that is the physical, chemical and the biological methods in which the aerobic digestion is often used to conditions. So, mostly the following dewatering that is the centrifugation using of the decanter centrifuge methods the sludge can then be disposed by the incineration and the lead filling etcetera. The most of the organic waste material may be degraded biologically or by aerobic or anaerobic processes using different organism. The mostly widely used aerobic process is the trickling filters, rotating disk, contractors, activator sludge process and there is other modification that is mostly used. So, as concerned anaerobic processes that is the digestion filters and the sludge blankers and the use both in the treatment of the specific wastewater and the sludge conditioning methods by the combination both aerobic and anaerobic strategy.