There is no wastewater system ...

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There is no wastewater system in our city (southeast asia) so our raw water is effectively untreated wastewater with ammonia often at 7 or 8mg/L, sometimes up to 10mg/L. We have installed MBBRs (moving bed biological reactors) as the first stage of our WTPs and get very good ammonia removal (up to 85%). The MBBRs are also relatively cheap and easy to install and operate. In addition, as we run conventional WTPs up to 350ML/d, we have stopped pre-chlorination and get additional biological treatment in the filter beds... though obviously need 100% assurance on your post-chlorination.