2.2.3 hydraulic retention time (Hydraulic Retention Time; HRT)
for storing waste water is a parameter that indicates the capacity of the fermentation tanks to handle the volume of waste water per day. Which is based on the properties and conditions used in the sewage system. The retention time must be long enough to allow the use concentrations are in the right spot. Is a dilution of toxins in the environment that is not harmful to the functioning of the microbes in the system. This may require a huge volume fermenter with it. HRT solid (Solid Retention Time; SRT) is another important parameter to control the types of microorganisms that play a role in the formation of methane, perform the procedure. There are several factors that must be considered in selecting the retention time of water lowered the healing process was not complete. If HRT is used too little will result in a risk of leaching out (wash-out) micro-organisms in the compost bin. As a result, lead to the failure of the system. For fermentation mix HRT wastewater solids retention time is equal. So if it takes too long will result in the accumulation of biomass in the system, too. The system may lose balance and halt it.
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